"It delivered room-shaking bass and dramatically demonstrated the
effectiveness of a single subwoofer placed to one side of the room"
- Julian Hirsh
Stereo Review, January 1997
907.2
"If you want the absolute-deepest, most feel it-in-your-tushy BASS
under a grand, look no farther than the Velodyne . . ."
Owner's Manual
- Corey Greenberg
Home Theater, February 1995
Velodyne Acoustics, Inc.
1070 Commercial St. Suite #101
San Jose, CA 95112
408.436.7270 voice
408.436.7276 fax
E-mail: [email protected]
Audio/Video Subwoofer System
Printed on recycled paper.
Download from Www.Somanuals.com. All Manuals Search And Download.
continuously without any problems. The unit is equipped with a
signal sensing turn on/off that will automatically turn on the unit
when a signal is present at the inputs and turn off the unit after
several minutes when there is no longer any signal at the inputs.
Congratulations!
Congratulations on your purchase of a Velodyne VA-907.2 sub-
woofer system. This system represents the state of the art in
accurate low frequency reproduction. Read and follow the instruc-
tions below to insure safe and proper system operation.
If you plan to leave the VA-907.2 unused for an extended period of
time, we recommend that you turn off the unit by the master power
switch on the rear panel.
Warning!
Troubleshooting & Service
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.
Before seeking service for your VA-907.2 subwoofer, please re-
check all systems. Following is a simple troubleshooting guide to
assist you.
Prior to installation
1. Verify unit is plugged in and power outlet used is active.
2. Is power switch on?
3. Is auto turn on/off set properly?
4. Is unit receiving an input signal from your source?
5. Have all controls on subwoofer (volume, crossover, phase,
etc.) been properly set?
Please unpack the system carefully. Remove all staples used to
seal the carton as they can scratch the cabinet. 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.
6. If unit has been running at high levels, one of the protection
circuits may be engaged.
Has the built-in amplifier overheated?
Has the speaker's voice coil started to heat up?
Product Features & Controls
● Built-in 100 watt (RMS) power amplifier
● Subwoofer Direct - switchable crossover bypass
● Adjustable (40 to 120 Hz) low-pass crossover
● Passive (85 Hz fixed) high-pass crossover
● Line-level inputs & outputs
If the protection circuitry is active, the unit may cycle on and off until
operating parameters return to normal. Under more serious condi-
tions, the unit may shut off completely. Normal operation will return
upon cooling, but you may be required to turn the power off and then
on again to reset the unit.
● Speaker-level inputs & outputs
● Signal sensing auto turn on/off with bypass option
● Variable volume control
● Selectable phase control (0 or 180 degrees)
● Anti-clipping circuitry
● Magnetically shielded for video use
● Dual staggered low-pass crossover; 12dB/octave initial,
24dB/octave ultimate
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 cabinet or circuitry is physically damaged.
● Gain compression circuit to protect woofer from over excursion
Thank you for purchasing a Velodyne!
● Input overload protection
continued. . .
☞
☞
2
9
Download from Www.Somanuals.com. All Manuals Search And Download.
enced by placement, depending on the acoustic properties of the
listening room. Typically, the optimum location for a subwoofer is
tucked away in a 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, and close to the center of your room. Avoid these
locations when possible. When using a pair of Velodyne subwoof-
ers in stereo, it is preferable to place each subwoofer by the satellite
of the same channel.
Installation
Your new VA-907.2 subwoofer system 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.
CAUTION!
Inputs
The VA series subwoofers have amplifiers built into the cabinet. Do
not place the cabinet next to sources of heat such as furnace
registers, radiators, etc. The power cord should be routed in such a
way that it will not be walked on, pinched, or compressed in any way.
Your new VA-907.2 subwoofer is equipped with both speaker-level
and line-level inputs. Use the LINE-IN jacks when connecting your
subwoofer to a pre-amp, signal processor, or line-level crossover.
The FROM AMPLIFIER jacks connect directly to the speaker
outputs of a integrated amplifier or receiver. Your amplifier section
will notice no additional loading effects when you use these inputs
because of their high impedance.
Regardless of where you install your VA-907.2 subwoofer, it must
remain in an upright position (passive radiator facing downward).
Using, shipping, or otherwise storing the VA-907.2 subwoofer in
any other position for an extended period of time may result in
damage to the unit not covered by warranty.
Note
Do not use both LINE-IN and FROM AMPLIFIER inputs simulta-
neously.
The VA-907.2 subwoofer is magnetically shielded to reduce mag-
netic emission from its cabinet to increase the number of possible
locations available for placement. However, this shielding may not
be adequate for all installations. Certain types of televisions are
particularly sensitive to stray magnetic fields. If your television
produces distorted colors after installation of your VA-907.2 sub-
woofer, simply increase the distance between your television and
the VA-907.2 until normal color and operation is returned.
Caution!
Polarity is critical when using speaker level inputs. Reversing the
polarity of speaker level inputs can damage the unit.
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 both the main speakers and
subwoofer.
Care of your subwoofer
Low-pass crossover
Do not use any harsh detergents or chemicals to clean the cabinet.
Abrasives, detergents, or cleaning solutions may damage the finish
on the cabinet. We recommend using a damp cloth to clean the
cabinet.
Both sets of 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 40 to
120 Hz. The subwoofer's response will begin rolling off above the
frequency you set this control to.
During normal conditions, the VA-907.2 subwoofer may be left on
continued. . .
☞
☞
3
8
Download from Www.Somanuals.com. All Manuals Search And Download.
Figure 2: Installation using speaker-level (from amplifier) inputs
You should set the crossover frequency to obtain a smooth and
seamless transition from the subwoofer 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.
POWER
LOW-PASS
CROSSOVER
VOLUME
CAUTION!
Serial
#
Label
TO SPEAKERS
RIGHT LEFT
FROM AMPLIFIER
LEFT
MADE IN USA
~
RIGHT
LEFT
RIGHT
IN
OUT
A bypass switch is also provided if you wish to use an external
crossover. If you are not using an external crossover, we recom-
mend that you use the one provided within the unit for optimum
performance.
Phase adjustment
MAIN OUTPUTS
(speaker-level)
This control allows you the ability to compensate for having the
subwoofer in a different location than the main speakers. Ideally,
you will have the sound from the subwoofer reach the listening
position the same time as the sound from the main speakers.
However, if the distance from the listening position to the subwoofer
and the distance from listening position to the main speakers differs,
the sound from each will reach your ears at a different time.
INTEGRATED AMP / RECEIVER
SATELLITE
SPEAKERS
Interconnect cables
This control allows the signal to be delayed 180 degrees so the
output of the subwoofer will blend in to that of your main speakers
without any cancellation.
When installing your VA-907.2 using the line-level inputs/outputs,
you should use standard shielded phono cables. Always keep the
lines as short as practical to minimize noise.
Auto turn on switch
The auto turn on switch allows the user to bypass the auto turn on
function if desired. When set in the "auto" mode with main power on,
the VA-907.2 will turn itself on when an input signal is present. If no
signal is present, after several minutes the unit will shut itself off.
When set in the "on" mode, the auto turn on/off function is bypassed
and the unit will be on whenever the main power switch is on.
When using the speaker-level inputs/outputs, use the same quality
speaker cable to your subwoofer as you run to your satellites.
Power switch
The master power switch is located on the right half of the unit. This
rocker style switch is the main on/off for the unit. This switch should
be set to position 1 for on (up), 0 for off (down).
Placement
True subwoofers operate at extremely low frequencies which are
primarily omnidirectional. While it is recommended that the sub-
woofer be placed on the same plane as the satellite speakers, room
and system conditions often dictate otherwise. Keep in mind that
frequency response and output levels can be drastically influ-
continued. . .
☞
☞
7
4
Download from Www.Somanuals.com. All Manuals Search And Download.
mance you should bypass the internal crossover in your Velodyne
subwoofer, the Subwoofer Direct feature.
Line-level connection
Figure 1 shows connection to a pre-amplifier's main outputs and
returning them to your amplifier inputs.
To bypass the crossover within the subwoofer, simply locate the
switch marked "out / in" on the back panel of the subwoofer and set
to the "out" position. This will eliminate the internal crossover
function.
When installed in this fashion, your satellite speakers will be
crossed over at 85Hz which removes the lower bass from your
amplifier and speakers, enabling them to do a better job reproduc-
ing high frequencies. By utilizing this method, you will have a bi-
amplified system, gaining improved power and headroom for your
system.
Note
If not using an external crossover, you should use the built-in
crossover for optimal performance.
Subwoofer out from A/V
Processor
A word about subwoofer outputs
The Velodyne subwoofer is designed to operate using the full range
audio signal for input when using the built-in crossover. Some
surround sound processors/receivers, including the Dolby AC3
system with their .1 channel output, have a "subwoofer out" jack that
From the low pass output of your signal processor Install into right
or left RCA line in connector in the back of the subwoofer or use a
"Y" connector adapter into both right and left RCA line in connectors
in the back of the subwoofer, and switch the crossover switch to
"out".
Figure 1: Installation using line-level (line in) inputs
POWER
LOW-PASS
CROSSOVER
VOLUME
Speaker-level connection
CAUTION!
Figure 2 shows an easy way to connect your VA-907.2 subwoofer
directly to your receiver or integrated amplifier.
Serial
#
Label
TO SPEAKERS
RIGHT LEFT
FROM AMPLIFIER
LEFT
MADE IN USA
~
RIGHT
LEFT
RIGHT
IN
OUT
When connected in this fashion, your satellite speakers will be
crossed over at 85 Hz, which removes the lower bass from your
speakers thus, enabling them to do a better job reproducing high
frequencies.
PRE-AMP
AMPLIFIER
MAIN OUTPUTS
RIGHT LEFT
MAIN OUTPUTS
MAIN INPUTS
RIGHT LEFT
RIGHT
LEFT
You may also connect your satellites directly to your receiver or
amplifier along with the subwoofer if you wish to bypass the internal
high-pass crossover.
TO SATELLITE SPEAKERS
Caution!
To avoid damage to your main amplifier, 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.
is already crossed over and designed to be used with a conventional
amplifier and speaker. Combining both an external crossover and
the one internal to the subwoofer may result in low output and
increased noise. In these cases, to optimize your subwoofer perfor-
continued. . .
☞
☞
5
6
Download from Www.Somanuals.com. All Manuals Search And Download.
|