Velodyne Acoustics Speaker SC 1250 SC 8 SC 10 SC 12 SC 15 SC IW SC IF SC IC User Manual

SubContractor™  
Series  
Amplifier /  
Subwoofers  
U S E R ’ S  
M A N U A L  
SC-1250 Amplifier,  
SC-8, SC-10, SC-12, SC-15,  
SC-IW, SC-IF, SC-IC Subwoofers  
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Attention!  
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Vorsicht!  
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Attenzione!  
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Table of Contents  
Congratulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
Product Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
SC-1250 Subwoofer Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1  
SC-8, SC-10, SC-12, SC-15, SC-IW, SC-IF Woofers . . . . . . . . . . . . . . . . . . . . . . . . .2  
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
Front Panel Controls and Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
About Low-Pass Crossovers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
A Word About Your Receiver’s Crossover and the SC-1250 Crossover . . . . . . . . . . .10  
A Word About Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
A Word About Subwoofer Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
Selecting the Subwoofer(s) to be Controlled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11  
Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Restore Defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14  
Care of Your Amplifier and Subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14  
Troubleshooting and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15  
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16  
Appendix A: RS-232 Serial Overview and Commands . . . . . . . . . . . . . . . . . . . . . . . . .17  
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Congr atulations  
Congratulations on your purchase of a Velodyne SubContractor Series subwoofer. This system  
represents the state-of-the-art in low frequency reproduction. Read and follow the instructions  
below to insure safe and proper system operation.  
Warning!  
To prevent fire or shock hazard, do not expose this equipment to rain or moisture. To avoid  
electrical shock, do not open speaker enclosure or amp chassis cover. Please observe all  
warnings on the equipment itself. There are no user serviceable parts inside. Please refer all  
service questions to your authorized Velodyne dealer.  
Prior to Installation  
Please unpack the system carefully. Remove all staples used to seal the carton as they can  
scratch the chassis. Please save the carton and all packaging materials for future use. Record  
the serial number in the space provided on the warranty card for future reference.  
Product Features  
SC-1250 Subwoofer Amplifier  
• Amplifier: 3000 watts dynamic/1250 watts RMS high efficiency, Class D  
• DSP-controlled  
• 4 selectable presets for customized listening mode  
• Automatic 7 band room equalizer (microphone included)  
• Night-mode setting  
• Mute control  
• Adjustable (30 to 160 Hz) low-pass crossover (defeatable)  
• Line-level (RCA) inputs and outputs  
• Speaker-level inputs with 5 way binding post connections  
• Signal sensing auto turn on/off (defeatable)  
• Variable volume control  
• Selectable phase control (0, 90, 180 or 270 degrees)  
• Built-in adjustable digital low-pass crossover with 24 dB/octave slope  
• Driver Displacement Control software to prevent over excursion and amp clipping  
• Blue power indicator LED  
• RS-232 Serial Interface  
• 12 Volt trigger  
• Universal remote input jack  
• Ability to drive up to TWO subwoofers**  
** If two subwoofers are driven, they must each have 8 ohm or higher impedence. SC Series  
subwoofers can be run in this fashion. If a more traditional 4 ohm subwoofer is driven with the  
SC-1250, only one can be driven.  
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SC-8, SC-10, SC-12, SC-15, SC-IW, SC-IF/IC Subwoofers  
SC-8:  
- 8” (6.5” piston diameter) subwoofer  
- 2.5” high-temp voice coil  
- Oversized spider for linearity at high excursion  
- High-excursion EPDM rubber surround  
- 107 ounce magnet/204 ounce motor structure  
- Frequency Response: 28 - 120 Hz (+/- 3 dB)  
- 8 ohm impedance  
SC-10:  
- 10” (8” piston diameter) subwoofer  
- 3” high temperature inside/outside voice coil  
- Oversized spider for linearity at high excursion  
- High-excursion EPDM rubber surround  
- 162 ounce magnet/346 ounce motor structure  
- Magnetically shielded for video use  
- Frequency Response: 24 - 120Hz (+/- 3 dB)  
- 8 ohm impedance  
SC-12:  
- 12” (9.7” piston diameter) subwoofer  
- 3” high temperature inside/outside voice coil  
- Oversized spider for linearity at high excursion  
- High-excursion EPDM rubber surround  
- 162-ounce magnet/346 ounce motor structure  
- Magnetically shielded for video use  
- Frequency Response: 22 - 120Hz (+/- 3 dB)  
- 8 ohm impedance  
SC-15:  
- 15” (12.7” piston diameter) subwoofer  
- 3” high temperature inside/outside voice coil  
- Oversized spider for linearity at high excursion  
- High-excursion EPDM rubber surround  
- 162-ounce magnet/346 ounce motor structure  
- Magnetically shielded for video use  
- Frequency Response: 22 - 120Hz (+/- 3 dB)  
- 8 ohm impedance  
SC-IW (In-Wall):  
- 4” x 14” rectangular driver (3” x 13.25” piston diameter) with flat Carbon  
Fibre/Rohacell/Carbon Fiber sandwich diaphragm  
- Neodymium magnet structure  
- Quad spider configuration with upper/lower spider modules  
- High-excursion EPDM rubber surround  
- 3” high temperature inside/outside voice coil  
- Magnetically shielded for video use  
- Frequency Response: 22 - 120Hz (+/- 3 dB)  
- 8 ohm impedance  
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SC-IF/SC-IC (In-Floor/In-Ceiling):  
- 12” (9.7” piston diameter) subwoofer  
- 3” high temperature inside/outside voice coil  
- Oversized spider for linearity at high excursion  
- High-excursion EPDM rubber surround  
- 162 ounce magnet/346 ounce motor structure  
- Magnetically shielded for video use  
- Frequency Response: 22 - 120Hz (+/- 3 dB)  
- 8 ohm impedance  
Ins tallation  
Your new Velodyne amplifier provides for a number of installation options. Read all the  
installation information below in order to determine which installation option is best for your  
system. Remember to perform all installation procedures with system power turned off.  
FRONT PANEL CONTROLS AND DISPLAYS  
Figure 1: Front Panel Connections of the SC-1250.  
Following are brief descriptions of the controls described in Figure 1. More detail on these  
controls can be found in the next section.  
(1) Power Switch  
This push button style switch is the main on/off for the unit.  
(2) Power LED  
This LED illuminates when the power is on. Blue is normal operation. It turns amber when  
the unit is in standby mode or the remote has been used to deactivate the unit. This LED  
dims when the unit is in night mode.  
(3) Mic Input  
Connect the supplied microphone for the Auto-EQ feature to this mini-jack.  
(4) Remote Eye  
This is the eye that receives infrared commands from the supplied remote.  
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(5) Low-Pass Crossover  
Use these up and down buttons to select the high-frequency range at which you wish to cut  
off the signal to the subwoofer. The frequency is indicated on the LED display briefly, then  
the display reverts to showing the subwoofer’s volume. The slope is fixed at 24 dB/octave.  
To deactivate the crossover, press BOTH the up and down crossover buttons at the same  
time – two dashes on the display indicate the crossover is deactivated and the woofer  
plays all frequencies presented to it. Please see page 9 for a more detailed discussion  
on crossovers.  
(6) LED Numeric Indicator  
This LED supplies information on volume, crossover, woofer type, and other information. The  
light button on the remote deactivates this display. Upon startup, the display shows the  
model of subwoofer the SC-1250 is controlling, then reverts to the volume indicator.  
(7) Volume Control  
These buttons allow you to balance the output from the subwoofer to the main speakers in  
your system. The volume should be set to achieve similar volume level from between both  
the main speakers and subwoofer. The default volume is 30.  
Note: Volume is also controllable by using the supplied remote.  
(8) Optional Rack Mount  
These detachable ears allow the SC-1250 to be rack mounted.  
REAR PANEL CONNECTIONS  
Figure 2: Rear Panel Connections of the SC-1250.  
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(9) Thru Jacks (See Figure 3A)  
These RCA connectors are for passing along the same signal that goes into your subwoofer  
to a second “daisy-chained” subwoofer. The signal from these RCA connectors is the same  
as the input signal.  
(10) Line Input / LFE Input (See Figure 3A & 3B)  
Connect these jacks to the LINE OUT preamp output, LFE output, or subwoofer output jacks  
of your receiver/processor. If using the LFE output from your receiver or processor, plug  
the single cable into the jack labeled LFE input or, for more signal, use a “Y” connector and  
feed the signal into both “R” and “L” inputs.  
Option 1  
Figure 3A: Mono (LFE) Line-Level Connection.  
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Option 2  
Figure 3B: Stereo Line-Level Connection.  
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(11) Balanced XLR LFE Input (See Figure 4)  
This XLR input jack receives the balanced LFE signal from your receiver or processor.  
Figure 4: Balanced Line-Level Connection.  
(12) Mic Input  
Connect the supplied microphone for the Auto-EQ feature to this mini-jack.  
(13) IR Input  
Connect an IR repeater to this jack for use with universal remote systems.  
(14) 12V Trigger  
When this mini jack is connected, the unit remains in power-off mode until 12 volts is  
supplied across the two leads. Polarity is irrelevant.  
(15) RS-232 In  
Use this port to communicate with a touch panel remote control. See Appendix A for an  
explanation of the use of the serial port, available commands, and their formats.  
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(16) Auto ON/OFF Switch  
Use this switch to select between auto-on active and auto-on inactive (constant on) operation.  
For maximum amplifier life, we recommend using the auto-on/off feature.  
(17) Speaker Level Output Terminals (See Figure 5)  
These connections send a crossed-over speaker-level signal to the front speakers. When  
connected in this fashion, your satellite speakers will be crossed over at 80 Hz. This  
removes the lower bass frequencies from your satellites, enabling them to do a better job  
reproducing high frequencies and giving your receiver’s amp more headroom (up to 50%  
more power).  
You may also connect your satellites directly to your receiver or amplifier along with the  
subwoofer if you wish to bypass this crossover.  
Figure 5: Speaker-Level Connection.  
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(18) Speaker Level Input Terminals (See Figure 5)  
Connect these input terminals to the speaker output terminals of your amplifier or receiver.  
If you use this method of connection, when you go to the receiver speaker set up menu, make  
sure you select the “large” speaker option.  
(19) Subwoofer Connection Terminals  
Connect these output terminals to the subwoofer(s) being controlled by the SC-1250. Only  
connect ONE subwoofer per red/black pair of subwoofer output terminals - DO NOT connect  
the subwoofers in a “daisy chain” configuration.  
Note: SC series subwoofers are designed so that TWO subwoofers can be driven from a  
single SC-1250 amplifier. If you are using the SC-1250 to power a non-SC subwoofer, make  
sure you check the resistance of the subwoofer’s voice coil. A SINGLE 4 ohm subwoofer can  
be driven with the SC-1250, but not TWO 4 ohm woofers. If you attempt to run more than a  
single 4 ohm subwoofer, internal protection circuitry will activate within the SC-1250.  
Caution!!!  
To avoid damage to your SC-1250, be sure to maintain correct polarity when making all  
connections. Red (positive) to red, and black (negative) to black. Be sure that all connections  
are tight, and that there are no loose strands or frayed wires.  
(20) Power Cord Adaptor  
Connect the detachable 117V~60Hz 15A AC power plug to this male interface connection.  
The detachable cord allows for easy replacement should the original be damaged.  
(21) Fuse  
If the unit is not functioning, check the fuse. If the fuse is blown, replace with an identically  
rated fuse. If the fuse blows again, refer the unit for service.  
(22) Master Power Switch  
Press the POWER switch to the ON position to activate the amplifier. If the unit is to be left  
unused for an extended period of time, move this switch to the OFF position to prolong the  
life of the amplifier.  
REAR PANEL CONNECTIONS – DETAILED EXPLANATION  
The SC-1250 is equipped with both speaker-level and line-level inputs. Use the RCA/Phono type  
“INPUT” jacks when connecting from a pre-amp, signal processor, or line-level crossover. The  
“SPEAKER LEVEL INPUT” jacks connect directly to the speaker outputs of an integrated amplifier  
or receiver. Your amplifier section will notice no additional loading effects when you use these  
inputs because of their high impedance.  
Note: Do not use both the RCA/Phono “INPUT” connections and “SPEAKER LEVEL INPUT”  
connections simultaneously.  
About Low-Pass Crossovers  
All of the SC-1250 inputs sum the left and right channels together and the resulting signal is  
passed through an adjustable low-pass crossover before being amplified. The crossover control  
allows you to adjust the upper limit of the subwoofer’s frequency response from 30 to 160 Hz.  
The subwoofer’s response will begin rolling off above the frequency you set this control to. The  
slope is 24 dB/octave.  
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You should set the crossover frequency to obtain a smooth and seamless transition from the  
subwoofer(s) to the main speakers in your system. If your main speakers are smaller units with  
limited low frequency output, you may wish to choose a higher frequency (such as 100-120 Hz)  
than you would with larger speakers which have greater low frequency output. With larger  
speakers, you might start with this control set lower, such as 80 Hz.  
Most receivers and processors provide an option to characterize main speakers as “large” or  
“small.” This affects the crossover point. We recommend in most cases setting the main  
speakers to “small,” despite their size and frequency response characteristics. This is because  
the powerful 1250 watt SC-1250 combined with the SC subwoofer(s) you have acquired are  
more than likely more suited to low bass reproduction than your amp and main speaker  
combination. With the burden of low frequency reproduction relieved, your amplifier and main  
speaker combination will enjoy better performance and about 50% more available headroom,  
enabling them to more accurately reproduce the rest of the frequency spectrum.  
Disabling the Low-Pass Crossover (Subwoofer Direct)  
If your receiver/processor provides a crossover to the subwoofer(s), you may want to bypass  
the SC-1250’s low-pass crossover. To do this, depress BOTH the Crossover UP and Crossover  
DOWN buttons simultaneously. The numeric LED will show  
crossover has been defeated. To reactivate the low-pass crossover, simply push the crossover  
UP or crossover DOWN buttons.  
indicating that the low-pass  
--  
A Word About Your Receiver’s Crossover  
and the SC-1250 Crossover  
Your Velodyne SC-1250 amplifier is designed to operate using the full range audio signal for  
input when using the built-in crossover (controlled by the dial on the back panel). Many home  
theater processors/receivers (Dolby Digital®, DTS®, THX™) have a “subwoofer out” jack that  
performs this same function and are designed to be used with a powered subwoofer.  
In these installations, you may want to bypass the crossover in either the processor or the  
Velodyne SC-1250 as described above. However, in some cases you may want to use BOTH  
crossovers. If you choose to do this you should stagger the frequencies, (i.e., 120 Hz  
subwoofer, 80 Hz processor) for best results.  
Note: If not using an external crossover, you should use the built-in crossover for optimal  
performance. When using a single RCA sub out from the processor, it does not matter which  
line level input (L/R) is used.  
A Word About Interconnect Cables  
When installing your Velodyne SC-1250 using the line-level connections, you should always use  
high quality shielded interconnect cables. It is recommended that you keep the length of cable  
as short as possible to avoid any potential external interference problems.  
When connecting the SC-1250 to your subwoofer(s), use a quality speaker cable that is at least  
14-gauge. Be very careful to avoid any loose or frayed strands that could result in a short,  
causing a dangerous condition and possible damage to your unit. Cables of extremely large size  
are typically not required. Extremely large gauge wire may not properly fit in the binding posts,  
resulting in a poor connection and possible short circuits.  
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A Word About Subwoofer Placement  
Subwoofers operate at extremely low frequencies, which are primarily omni-directional. Keep in  
mind that frequency response and output level can be drastically influenced by placement,  
depending on the acoustic properties of the listening room. Typically, the optimum location for  
a subwoofer is in a front corner of your listening room. This location will usually offer the  
greatest output levels and optimum low frequency extension. The worst location for a  
subwoofer is typically far away from any walls, close to the center of your room and near an  
opening or doorway. Avoid these locations when possible. When using a pair of SC subwoofers  
in stereo, it is preferable to place each subwoofer by the satellite of the same channel. Typically,  
a minimum distance of one to two feet from your TV to the subwoofer will be adequate to avoid  
any magnetic interference.  
Remember that the built-in 7 band EQ will help to get the most performance out of your  
subwoofer no matter where it is placed.  
Caution!  
This amplifier has electronics built into the cabinet. Do not place the chassis next to sources  
of heat such as furnace registers, radiators, etc. Do not place the unit near sources of  
excessive moisture, such as evaporative coolers, humidifiers, etc. The power cord should be  
routed in such a way that it will not be walked on, pinched or compressed in any way that could  
result in damaging the insulation or wire.  
Selecting the Subwoofer(s) to be Controlled  
Your SC-1250 can control a variety of Velodyne subwoofers as well as generic passive  
subwoofers. Special internal software settings are designed to maximize performance and  
reliability depending on the model of subwoofer being controlled, so it is important to match  
the SC-1250 amplifier with the subwoofer(s) it is controlling. The SC-1250 comes with a  
default setting for the SC-10 subwoofer. When the unit is first powered up, the model being  
controlled is displayed for two seconds on the numeric LED before the display reverts to the  
volume setting.  
To change the subwoofer to be controlled, power up the unit while depressing any of the buttons  
on the front panel (crossover UP or DOWN, or power UP or DOWN). The unit will show the  
model it is currently controlling. To change the model, simply push the crossover UP or  
crossover DOWN buttons to change the model. Following is a chart of the subwoofers available  
to be controlled and the corresponding numeric LED display:  
Model  
LED Display  
Model  
LED Display  
SC-Inwall (SC-IW)  
I
W
SC-8  
8
SC-In Floor (SC-IF)  
SC-In Ceiling (SC-IC)  
IF  
SC-10  
SC-12  
SC-15  
I0  
I2  
I5  
IC  
Generic Subwoofer** GS  
** - The generic subwoofer setting is for passive subwoofers not on the above list. CAUTION:  
there is no anti-clipping or anti-distortion protection on this setting.  
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Usage  
This section addresses day-to-day usage of your SC-1250 amplifier.  
Remote Control  
The features of the SC-1250 remote control are listed below.  
• POWER — This button forces your SC-1250 unit into standby  
mode. The power LED turns amber, the numeric LED shuts off,  
and the amplifier puts out no power. The unit will remain in this  
mode until the POWER button is pressed again.  
To fully  
deactivate (i.e. power down) the unit, press the power switch on  
the front panel.  
Note: The master power switch on rear panel must be on in order  
for the front power button to function.  
• MUTE This button mutes the subwoofer. The LED on the  
amplifier will show 00 if the unit is muted. To unmute the  
subwoofer, press the MUTE button again and the original volume  
setting shows on the LED.  
Figure 6: SC-1250 Remote.  
• EQ — This button automatically EQs the subwoofer using a 7 band internal graphic equalizer.  
To use this feature, first plug the supplied microphone into the Mic-In jack on the back panel  
of the subwoofer and place the mic in your preferred listening position. Then, by pressing EQ  
on the remote, the subwoofer emits 12 “sweep tones” that cover the frequencies between  
20 and 150 Hz. The LED displays “AU” during the Auto-EQ process. After the sweeps are  
complete, the unit saves its EQ settings and returns to normal operation. To prevent  
accidental invocation of the EQ feature, you must hold down the EQ button for 2-3 seconds  
before the EQ sweeps begin.  
Note: Each time the EQ feature is utilized, the EQ settings for the SC-1250 are reset. If the  
microphone is not plugged in, the SC-1250 will emit one or two sweep tones then cease the  
EQ operation. In this case, the previous EQ settings will be preserved.  
• PHASE — These buttons allow you to optimize the subwoofer performance for the location  
and your listening position. Select the switch position at which you hear the most bass. The  
LED will show the phase selected by showing “PH” followed by the phase number.  
• LIGHT — If you wish, you can deactivate the numeric LED on your SC-1250. To do this, press  
the LIGHT button on your remote. To reactivate the LED, press the LIGHT button again.  
• NIGHT — Night mode limits the maximum output of the subwoofer for late night listening  
or to be more considerate of close neighbors. Press the night button to turn the night  
mode feature on or off. Night mode, when active, is indicated by the reduced intensity of the  
power LED.  
• VOLUME CONTROL — This control allows you to balance the output from the subwoofer to  
the main speakers in your system. This control should be set to achieve similar volume level  
from between both the main speakers and subwoofer. When pressing volume up or down,  
the volume level is shown on the numeric LED on the front panel.  
Note: The volume can also be adjusted via the volume buttons on the front panel of the  
amplifier. These buttons have the same effect as pressing the up and down volume buttons on  
your remote.  
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• PRESETS — There are 4 presets, consisting of Movies, R&B – Rock, Jazz – Classical, and  
Games. As a preset is chosen, the preset is shown on the numeric LED as P1 for preset 1,  
P2 for preset 2, etc. The presets provide the following characteristics for bass reproduction:  
Movies:  
Maximum output and impact for explosions and other  
action adventure movie content.  
R&B – Rock:  
Provides the driving bass found in today’s rock music.  
Jazz – Classical: The tightest, cleanest, lowest distortion bass.  
Games: Maximum loudness available for the impact of video games.  
The following table indicates musical style and which preset is recommended for it.  
MUSICAL STYLE  
Action Adventure Movies  
Country – Rock  
Country – Soft  
Folk  
SUGGESTED PRESET  
Movies  
R&B – Rock  
Jazz – Classical  
Jazz – Classical  
R&B – Rock  
Indie Music  
Pop  
R&B – Rock  
Rock  
R&B – Rock  
Alternative Rock  
Blues  
Jazz – Classical  
Jazz – Classical  
Jazz – Classical  
Jazz – Classical  
Jazz – Classical  
R&B – Rock  
Broadway and Vocalists  
Children’s Music  
Christian and Gospel  
Classic Rock  
Classical  
Jazz – Classical  
R&B – Rock  
Dance and DJ  
Hard Rock/Heavy Metal  
Latin Music  
R&B – Rock  
R&B – Rock  
Miscellaneous  
Jazz – Classical  
Jazz – Classical  
Movies  
– Non-Action Adventure  
New Age  
Jazz – Classical  
Jazz – Classical  
R&B – Rock  
Opera and Vocal  
R&B  
Rap and Hip-Hop  
Soundtracks  
R&B – Rock  
R&B – Rock or Jazz  
– Classical  
Video Games  
Games  
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Each preset has its own characteristics with respect to subsonic filter, volume differential and  
a single equalizer (EQ) in order to optimize the listening mode for the preset.  
The following table shows the settings for the various presets:  
Preset  
Subsonic Filter  
Frequency  
EQ  
Frequency  
EQ  
Level  
Volume  
Differential  
Movies  
24 Hz  
27 Hz  
24 Hz  
37 Hz  
52 Hz  
N/A  
+4 dB  
+3 dB  
N/A  
+8 dB  
+5 dB  
N/A  
R&B – Rock  
Jazz – Classical  
(Reference)  
Games  
34 Hz  
62  
+4 dB  
+4 dB  
Res toring Defaults  
There is a feature that allows you to restore default settings for your SC-1250. By pressing  
presets in EXACTLY the following order on the remote, the unit’s power light will blink indicating  
that you have restored defaults.  
Preset 1: Movies  
Preset 2: R&B – Rock  
Preset 3: Jazz – Classical  
Preset 4: Games  
Preset 4: Games  
Preset 3: Jazz – Classical  
Preset 2: R&B – Rock  
Preset 1: Movies  
When you press the presets in the above order, the numeric LED will display “P3” indicating that  
you have restored defaults. The unit’s volume is reset to level 30 out of 80.  
Care of your Amplifier and Subwoofer  
Do not use any harsh detergents or chemicals to clean the SC-1250 chassis or the subwoofer  
cabinet. Abrasives, detergents, or cleaning solutions will damage the finish on the SC-1250  
chassis or the subwoofer cabinet. We recommend using a damp cloth to clean the front, back  
and sides.  
During normal conditions, the amplifier may be left on continuously without any problems. If you  
plan to leave the unit unused for an extended period of time, we recommend that you turn off  
the unit by the master power switch on the front panel.  
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TROUBLESHOOTING AND SERVICE  
Before seeking service for your amplifier or subwoofer, please re-check all systems. Following  
is a simple troubleshooting guide to assist you.  
1. Verify that the unit is plugged in and power outlet used is active.  
2. Is the power switch on?  
3. Is the unit receiving an input signal from your source?  
4. Have all controls on the amplifier (volume, crossover, phase, etc.) been properly set?  
5. If the unit has been running at high levels, one of the protection circuits may be engaged.  
Has the amplifier overheated?  
6. Has the power button been depressed on the remote?  
If the protection circuitry is active, the unit may cycle on and off until operating parameters  
return to normal. Under more serious conditions, the unit may shut off completely. Normal  
operation should return upon cooling, but you may be required to turn the power off and then  
on again to reset the unit.  
The following conditions require service by a qualified technician:  
1. The power cord has become damaged  
2. The unit does not appear to operate normally or exhibits a marked  
change in performance  
3. The unit has been exposed to water  
4. Some part of the chassis or circuitry is physically damaged  
Thank You for Purchasing an SC-1250!  
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SubContractor User’s Manual  
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Appendix A: RS-232 Serial Overview and Commands  
Introduction  
This document outlines Velodyne’s SubContractor (SC) RS-232 protocol specification. This  
protocol indicates how SC products receive run-time commands from devices such as Creston  
Universal Remote Controls.  
Com Port Setup  
Use standard communications settings: Baud Rate: 9600, Data Bits: 7, Parity: None, Stop  
Bits: 1  
SC IN and OUT Port Pin Configuration  
SC serial ports use a standard configuration that allows direct connection to a PC via a FEMALE  
to MALE serial cable. It uses only three pins (Transmit, Receive, Ground).  
The pin configurations are:  
IN:  
Pin 2 = Transmit  
Pin 3 = Receive  
Pin 5 = Ground  
OUT:  
Pin 2 = Receive  
Pin 3 = Transmit  
Pin 5 = Ground  
Runtime Command Format  
Byte Number  
0
Byte Description  
Notes  
‘#’  
Header Character  
1 to 3 or 4  
Command and  
3 to 4 ASCII characters see formats below  
Parameter Data  
Case sensitive - CAPS ONLY!  
4 or 5  
‘$’  
Termination Character (required or  
command is ignored)  
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RS232 Commands  
Activity  
Command Acceptable  
Example(s)  
Comments  
Format  
n Values  
Volume Control #VOnn$,  
00 – 80  
#VO25$,  
#VO+$,  
#VO-$,  
Sets volume to a value,  
increments volume up  
or down, or requests  
current volume setting  
#VO+$,  
#VO-$,  
#VO?$  
#VO?$  
Preset Control  
#PSn$,  
#PS?$  
1, 2, 3, 4  
#PS1$, #PS2$, Activates the indicated  
#PS3$, #PS4$, preset, or requests  
#PS?$  
the current preset  
Logo Light  
Control  
#LTn$,  
#LT?$  
0: Light Off  
1: Light On  
#LT0$  
#LT1$  
#LT?$  
Turns the Logo Light  
on or off, or requests  
light state  
Night Mode  
Control  
#NMn$,  
#NM?$  
0: Night  
Mode Off  
1: Night  
Mode On  
#NM0$  
#NM1$  
#NM?$  
Activates/Deactivates  
Night Mode, or  
requests light  
mode state  
Mute Control  
Power Control  
#MUn$,  
#MU?$  
#MU0$  
0: Mute Off  
1: Mute On  
#MU1$  
#MU?$  
Mutes/Unmutes the  
woofer, or requests  
mute state  
#JUn$,  
#JU?$  
0: Power Off #JU0$  
1: Power On #JU1$  
#JU?$  
Powers On/Powers  
Off the woofer, or  
requests power state  
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Other Velodyne Subwoofer Products:  
110V  
230V  
Digital Drive 1812  
MiniVee™  
SMS™-1  
Digital Drive 1812  
Signature Edition  
SMS-1  
SPL-800i  
Signature Edition  
DD Series  
DD-10  
CHT-R Series  
CHT-8R  
SPL-R Series  
SPL-800R  
SPL-R Series  
SPL-800R  
DD-12  
CHT-10R  
CHT-12R  
CHT-15R  
DD-15  
SPL-1000R  
SPL-1200R  
SPL-1500R  
SPL-1000R  
SPL-1200R  
SPL-1500R  
DD-18  
DLS-R Series  
DLS-3500R  
DLS-3750R  
DLS-4000R  
DLS-5000R  
DD Series  
DD-10  
VRP Series  
VRP-1000  
VRP-1200  
DD-12  
DD-15  
DD-18  
VX Series  
VX-10  
DPS Series  
DPS-10  
DPS-12  
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LIMITED WARRANTY  
VELODYNE ACOUSTICS, Inc. (“VELODYNE”) warrants all electronics and powered subwoofers for a period of two  
years and full range speakers for a period of five years. All VELODYNE products have a warranty from the date of  
purchase against defects in materials and workmanship subject to the following conditions:  
1. VELODYNE is not responsible for defects which result from the use of an amplifier or controller other than  
the one originally supplied with the unit (subwoofer) or defects which result from modifications or repairs  
made by any component of the system by anyone other than a VELODYNE factory authorized  
service representative.  
2. This warranty is void if any repairs or service covered by the terms of this warranty are made to any  
component of the system by anyone other than a VELODYNE factory authorized service representative.  
3. VELODYNE is not responsible for damage caused by accidents, abuse, misuse, natural or personal disaster  
or unauthorized modification. The VELODYNE products are not intended for professional or commercial use  
and VELODYNE is not responsible for damage resulting from such use.  
4. The VELODYNE product warranty is limited to units that are purchased from authorized VELODYNE dealers  
and finalized within authorized dealer locations.  
5. This warranty is nontransferable under any condition.  
TO OBTAIN SERVICE  
Information regarding service may be obtained from the dealer from whom you purchased the unit, or by contacting  
VELODYNE customer service. Warranty service must be performed by a VELODYNE factory authorized service  
representative within the warranty period set forth above. If VELODYNE determines the unit is defective, VELODYNE  
will, at VELODYNE’s option, repair or replace the product at no charge if the product is forwarded prepaid to a factory  
authorized service representative. Products forwarded to the factory authorized service representative should be  
shipped securely and properly packaged, insured and freight prepaid.  
Velodyne Acoustics, Inc.  
345 Digital Drive  
Morgan Hill, CA 95037  
408.465.2800 voice  
408.779.9227 fax  
408.779.9208 service fax  
Service E-mail: [email protected]  
Product E-mail: [email protected]  
Technical E-mail: [email protected]  
63-SC1250 Rev A APR 2006  
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