Meyer Sound Portable Speaker S 1 User Manual

S-1  
Control  
Electronics  
Unit  
Operating Instructions  
PUSH  
CAUTION: Set voltage before applying power.  
90-250 VAC  
50-60 Hz  
100mA MAX  
The Meyer Sound S-1 is  
a single-channel active  
signal processor de-  
signed for use with the  
USM-1 Loudspeaker. It  
occupies a single 1 34-  
inch rack space.  
+
+
+
+
90-105  
105-125  
Lift  
AC Voltage Ranges  
210  
180  
105  
90  
-
-
-
-
250  
210  
125  
105  
-
-
-
-
210-250  
180-210  
GND  
Input  
Input  
Lo Sense  
Hi Sense  
Lo Out  
AC Voltage  
1/4  
A
SloBlo  
Hi Out  
The functions of the S-1  
are:  
Input  
Active crossover for  
biamplification  
PUSH  
PUSH  
SpeakerSense™  
driver protection with  
MultiSense™ function  
Lo Channel  
Amplifier  
Hi Channel  
+
+
True excursion limit-  
ing to protect the  
USM-1 drivers  
Loudspeaker fre-  
quency and phase  
response alignment  
Loudspeaker Cable  
The S-1 operates at line level and is intended to be the  
final component in the signal chain before the power  
amplifier. Connections between the S-1 and the power  
amplifier should be made according to the diagram  
above.  
The Sense connection must be made in order for the  
driver protection circuitry to operate properly.  
Connections  
Note: The S-1 Sense inputs incorporate Meyer Sound’s  
exclusive MultiSense™ function, which allows use of  
multiple power amplifiers driven in parallel from a single  
S-1 and having different voltage gains and/or power  
ratings. The S-1 accommodates up to two power amplifi-  
ers, and provides a separate Sense input for each. The  
MultiSense circuit automatically tracks the power ampli-  
fier with the greatest output swing to control the system  
protection circuitry. These inputs are polarity-sensitive:  
be certain that they are connected with correct polar-  
ity, as indicated on the S-1 rear panel.  
1. Signal inputs to the S-1 may be either balanced or  
unbalanced. For best signal-to-noise ratio, use balanced  
connections operating at +4 dBu nominal. The S-1 will  
accept peak input levels up to +26 dBu balanced, or  
+20 dBu unbalanced.  
Note: The S-1 utilizes Meyer Sound’s exclusive ISO™  
Input. Pins 1, 2 and 3 are transformer-isolated, and the  
connector shell is connected to earth ground. The Input  
GND/ Lift switch controls the connection between pin 1  
and circuit common, which is tied to AC/chassis ground  
through a 500 ohm resistance. If hum problems occur,  
this switch may be used to control ground loops in the  
system.  
3. Signal outputs from the S-1 are active balanced at  
+4 dBu nominal operating level, with pin 1 tied to earth/  
chassis ground through a 500 ohm resistance. The maxi-  
mum output level is +26 dBu balanced (+20 dBu unbal-  
anced).  
2. SpeakerSense™ connections are made from the  
output of the power amplifier back to the S-1 Sense in-  
puts. The Hi output of the power amplifier must be con-  
nected to the Hi Sense input, and the Lo output of the  
power amplifier to the Lo Sense input .  
4. Connections between the power amplifier output and  
the USM-1 should be made in accordance with the  
USM-1 Operating Instructions. These connections  
must be verified for correct polarity and correct channel  
assignment (Hi to Hi, Lo to Lo).  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
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S-1  
Control  
Electronics  
Unit  
Operating Instructions  
To verify limiter operation in the field:  
Supply an input to the S-1, preferably a sine-wave  
oscillator. If you do not have an oscillator, use a  
microphone and a mixer to produce a line level signal.  
Set the input frequency according to this table:  
Limiter Operation  
Disconnect loudspeakers, leaving the amplifier and  
the S-1 in their standard connection configuration.  
Oscillator  
200 Hz  
Microphone  
low growl  
LF limiter  
HF limiter  
VHF limiter  
If your amplifier requires a load, use resistive loads  
sufficient to dissipate the full power of the amplifier.  
5,000 Hz  
16,000 Hz  
loud whistle  
loud hiss  
Turn on both the S-1 and the amplifier.  
Bring up the input until you see the corresponding  
limit indicator come on. Since the indicator will light  
only if the limiter actually operates, it provides a  
positive indication that the limiter is functioning.  
Set the VHF switch to VAR, the Lo Cut out, and the  
Safe switch in.  
The standard connection configuration for the S-1 Control  
Electronics Unit uses a single two-channel amplifier as a  
biamplifier, one channel for the lows and one for the  
highs. In large systems where a number of S-1’s are  
used, some may prefer to assign one or more amplifiers  
only to the lows, and other amplifiers only to the highs. In  
either case, the Lo and Hi amplifiers must have equal  
voltage gain. If they do not, you may balance your sys-  
tem using an oscillator and an RMS-reading voltmeter.  
Input the oscillator to the S-1 and set its frequency to  
1400 Hz ±5 Hz (Use a frequency counter if possible).  
Balancing  
Amplifier Gain  
Set the S-1 Lo Cut switch out, the VHF switch to  
CAL, and the Safe switch out.  
Measuring with the voltmeter at the Hi amplifier out-  
put, advance the S-1 Attn dB control to a convenient  
reading (a few volts).  
Connect the S-1 and amplifiers as you wish to use  
them, leaving speakers disconnected.  
Now measure at the Lo amplifier output, If the level is  
different, adjust the input level control of the amplifier  
whose output voltage is higher until the Hi and Lo  
outputs are equal.  
If an amplifier requires a load, use an 8-ohm resistor  
sufficient to dissipate the full power of the amplifier.  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
Download from Www.Somanuals.com. All Manuals Search And Download.  
S-1  
Control  
Electronics  
Unit  
Operating Instructions  
Input Type1  
Output Type  
Balanced ISO-Input, 10k ohms, 5k ohms per leg  
Specifications  
Active push-pull, 600 ohms output impedance  
Maximum Input Level  
Balanced  
+26 dBu  
+20 dBu  
Unbalanced  
Maximum Output Level  
Balanced  
+26 dBu  
+20 dBu  
Unbalanced  
Hum and Noise2  
<-90 dBV  
Dynamic Range3  
108 dB  
Sense Inputs  
10k ohms true differential, opto-isolated  
1400 Hz  
Note 1:  
ISO™ Input: Pins 1, 2 and 3  
are transformer-isolated,  
and shell is connected to  
chassis/AC earth ground.  
Electronic Crossover Frequency  
Low Frequency Delay Type  
Active all-pass  
Note 2:  
Driver Protection Circuitry  
Low Frequency  
“A”-weighted, unbalanced.  
Note 3:  
RMS limiter, 100 msec. integration time  
LF excursion limiter (instantaneous)  
High Frequency  
RMS limiter, 100 msec. integration time  
VHF peak limiter, 2 msec. on-time, 35 msec. release time  
HF excursion limiter (instantaneous)  
“A”-weighted noise floor to  
maximum output.  
Indicators  
Sense/Amplifier Gain Detect; Hi and Lo  
Green/Red LEDs  
Red LEDs  
RMS Limiter, Excursion Limiter; Hi, Lo and VHF  
Safe  
Green LED  
Power Supply  
Green/Red LED  
Controls  
Front Panel  
Preset Panel  
Input attenuator, AC power switch  
Lo Cut switch, Safe switch, VHF var/cal switch  
VHF control (3/4-turn screwdriver adjust)  
Ground lift switch, AC range switches  
Rear Panel  
Connectors  
Balanced Input/Output  
Sense Inputs  
3-pin XLR (A-3) female/male  
Banana jacks (4 dual)  
Power  
90-125/180-250V AC, 50/60 Hz (rear-panel switchable)  
19" W x 134" H x 734" D, standard rack mount  
8 lbs (3.6 kg)  
Physical Dimensions  
Weight  
© 1992 Meyer Sound  
05.150.002.01A  
Meyer Sound Laboratories, Inc.  
2832 San Pablo Avenue  
Berkeley, CA 94702  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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