Numark Industries Stereo Amplifier SA3000 User Manual

Owners Manual  
SA3000/SA5500/SA9500  
Amplifiers  
 
SAFETY FIRST!  
WARNING - TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS  
APPLIANCE TO RAIN OR MOISTURE.  
WATER AND ELECTRICITY DO NOT MIX. Keep this unit away from water. If water or other liquids are  
spilled on or into this unit, unplug the power cord immediately from the wall socket (with DRY  
HANDS) and get a qualified service technician to check it out before using. Keep this unit away from  
heaters, radiators and other heat producing devices.  
DO NOT ATTEMPT TO SERVICE THIS UNIT. ONLY A QUALIFIED SERVICE TECHNICIAN SHOULD OPEN  
THIS UNIT FOR SERVICING.  
CAUTION  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated 'dangerous  
voltage' within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock.  
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance  
(servicing) instructions in the literature accompanying the product.  
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE  
COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER  
SERVICING TO QUALIFIED SERVICE PERSONNEL.  
KEEP IT CLEAN: Dust, dirt and debris can interfere with the performance of this product.  
Make a special effort to keep this unit away from dusty, dirty environments. Cover the unit  
when not in use. Dust it regularly with a soft, clean brush. Careful attention to these  
details will be time well spent, and this product will reward you with years of trouble free  
operation.  
Please take the time to read this manual before use. Store this  
manual in a safe place so that it is available should you ever  
need it again.  
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Contents  
Warning and Safety Instructions  
3
6
Introduction  
Front-Panel Description  
Back-Panel Description  
7
8
Audio Terms  
10  
Hook-up #1: Home Studio Reference Amp  
Hook-up #2: Mobile DJ Stereo PA  
Hook-up #3: Monitor Amplifier  
12  
12  
13  
13  
Hook-up #4: Stereo PA System  
Specifications  
14  
15  
16  
Block Diagram  
Warranty and Service Information  
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Introduction  
Thank you for choosing a Performance Series power  
amplifier from Numark. These units are designed to  
provide a good combination of power, audio clarity,  
and reliable operation. The basic circuit has been  
kept as simple as possible to reduce the amount of  
components, thereby shortening the signal path,  
coloration and the chance of component failure.  
However, we opted to add what we regard as  
essential protection against overheating, short  
circuits and power on transients.  
An efficient heat dissipation system, comprising a  
high surface area heatsink coupled with one or two  
fans (depending on power rating of amp), ensures  
quiet and reliable cooling.  
The sound quality and sturdy construction of the  
Performance Series makes these amps ideal for a  
multitude of amplification tasks, from installations,  
mobile DJs, home studios, houses of worship and  
touring bands.  
Since all of the amplifiers are similar in operation, this  
manual serves for all models. Please take the time  
to read this manual before connecting and operating  
your unit, as there is important information contained  
within. File the manual in a safe place for future  
reference.  
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Front Panel Description  
1. Gain Controls  
The protect light will also come on if the speaker terminals  
are short circuited, or the impedance of the load between  
them is too low. In these circumstances, the protect LED  
will stay lit until the fault condition is rectified.  
These two knobs are the level controls for each channel  
of the amplifier. The gain increases as the knob is turned  
clockwise. The SA5500 features detented gain controls  
with dB calibrations to simplify set up.  
The amplifiers large heatsinks, vents and fan should  
provide enough cooling even with a high ambient  
temperature. However, if the amp overheats, thermal  
shutdown protects the circuitry until the temperature is  
reduced to a safe level. Should the amp shutdown for  
thermal reasons, leave the power connected to the amp,  
try to improve ventilation, and reduce the gain. Without  
power, the fan cannot operate, and the amp will require  
longer to reach a low enough temperature to restart.  
2. Limit LED  
If an audio signal is amplified beyond the limit of the  
amplifier, the extremes of the signal will not reach the  
appropriate levels, giving the appearance of being clipped  
off when viewed on an oscilloscope. The audible result is  
distortion, which in small amounts can lead to rapid ear  
fatigue, and in larger amounts a harsh and unpleasant  
breaking up of the sound which can damage speakers.  
The SA5500 has a built in limiter on each channel to  
prevent clipping. Should the signal reach a level high  
enough to cause clipping, the limiter momentarily reduces  
the level just enough to prevent it. The limit LED lights  
whenever this occurs.  
4. Signal LED  
Each channel of the SA5500 features a signal LED to  
show that there is an audio signal at the input to the  
channel. The threshold for the indicator is -30dB, which  
should be enough that noise doesnt trigger the LED, but a  
faint audio signal will.  
If your system has a dedicated compressor, you may  
decide to use the limiting function of this instead. Although  
the limiting function of the SA5500 has no noticeable effect  
on the sound quality below clipping, some users may  
seek to disable it. See feature 11.  
5. Power Switch  
This turns the amp on and off. Although the SA5500  
features power on muting, it is nevertheless good practice  
to reduce both the gain controls before turning on the amp.  
The turn on procedure for powering up an audio system  
should be to start from the instruments and mixer, and  
verify operation before moving on to the power amps.  
Once the amps are on, verify they are receiving a signal  
and then slowly increase gain.  
3. Protect LED  
The SA5500 features several types of protection to  
prevent damage to the circuitry during turn on or fault  
conditions. The power on protection relay prevents  
damaging thumps to the speakers as the power comes  
on. When the amp is switched on, the protect LED will  
light for a few seconds and then go out, indicating that the  
relay has closed, connecting the speakers to the  
amplifier.  
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Back Panel Description  
6. Neutrick Connector Inputs  
8. Binding Post Outputs  
a. Balanced XLR Inputs  
BRIDGED MONO  
These combined inputs are commonly used for both  
mobile and installation set ups. The XLR provide a good  
combination of ease of connection and resistance to  
corrosion. They are wired as per the following  
convention:  
+
-
speaker  
speaker  
These are suitable for banana plugs, spade lugs or bare  
wires. Spade lugs and bare wires should both be  
screwed down tightly to exclude oxygen, and care  
should be taken to avoid loose strands of wire that may  
cause short circuits.  
b. Balanced 1/4” Inputs  
These types of jacks are featured on many audio  
products and are convenient if the amp is frequently  
connected and disconnected, such as for a mobile set up.  
The plugs used should be wired in the following way:  
9. Ground Lift Switch  
This switch allows the circuit and chassis grounds to be  
separated in case of a ground conflict. In normal use the  
switch should be in the ground on’ position. Lifting the  
ground (floating’ position) may resolve the ground  
conflict, but means that circuit grounding depends on other  
connected components. Deficiencies in the grounding of  
other components will affect the sound. A serious electric  
fault with the amplifier could damage other components in  
the system. For the best combination of safety and  
performance it is highly recommended to keep the switch  
in the ‘ground on’ position.  
tip  
ring  
sleeve  
gnd  
+ -  
7. Balanced Barrier Strip Inputs  
10. Stereo / Mono Bridge Switch  
These connection points provide the best option for  
permanent or long term installation. Connections should  
be screwed down tightly to exclude oxygen, and care  
should be taken to avoid loose strands of wire that may  
cause short circuits.  
In stereo operation, each channel of the amplifier runs  
independently with its own signal and speaker(s).  
However, both channels can be configured to drive a  
single load with a single signal at twice the power.  
To do this, follow these steps:  
1 . switch the amp OFF  
2. put one speaker of not less than 4 ohms impedance  
across the red (+) output terminals of the amplifier  
+
-
GND  
-
+
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3. ensure that there is only one input signal connected  
to channel 1 of the amplifier - channel 2 input must be  
vacant  
IMPORTANT: NEVER SWITCH BETWEEN  
STEREO AND BRIDGED MONO OPERATION  
WHEN THE AMPLIFIER POWER IS ON.  
4. switch the amplifier to bridged mono (back panel  
switch)  
11. Limiter On / Off Switch  
In cases where a dedicated compressor / limit unit  
precedes the SA5500, some users may seek to disable  
the on board limiting. Sliding the switch to the off position  
removes the limiting from both channels of the amplifier.  
5. turn the gain down and turn on the amp  
6. verify operation at low gain, and then increase power  
to desired level, ensuring that the gain controls on  
each channel are set equally.  
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Audio Terms  
Gain  
Hum and Buzz  
This is the factor by which an input signal is amplified  
(increased) or attenuated (reduced) when passing through  
an amplifier. Gain is generally measured in decibels (dB)  
which is a logarithmic ratio of input to output. Unity or  
zero gain means that the signal comes out at the same  
level that it went in.  
Hum typically is a lower pitched sound of around 50 or  
60Hz, depending on the AC supply. If the hum or buzz  
is very loud, this is generally caused by bad connections  
- check cables and plugs for faults.  
Lifting the Ground  
In other cases, a ground conflict between the chassis and  
the circuit ground can induce hum. This happens when a  
magnetic field induces a small voltage in the casing of the  
amp, making it slightly different in potential from the circuit  
ground. This hum sounds more subtle than it would be for  
a bad connection and is generally ignored. If your  
environment requires the highest quality sound, it may be  
eliminated by lifting the ground’. This is accomplished by  
moving the back panel switch from the ground on’  
position to the floating’ position. The electronic ground is  
then dependent on other connected components. For the  
best safety protection and protection of other components,  
it is strongly advised to keep the switch in the ‘ground on’  
position.  
With all this gain available, it may seem tempting to turn  
the amp up to full to get the loudest sound possible. And  
why is it that smaller amps have roughly the same gain  
even though they are less powerful? The answer is that  
an amp can only amplify up to a certain point, which  
depends on its power rating. Past this point, the output  
just distorts in what is called clipping. The peaks of the  
signal are clipped’ as they exceed the limit.  
max+  
max-  
#1. Peaks within amplifier limit  
max+  
Balanced Lines  
Power transformers and other devices which cause  
magnetic fields can induce hum in audio cables. This can  
be best combated by using balanced lines where inputs  
and outputs permit. Balanced lines use two conductors  
plus a shield (ground) to send a positive and negative  
version of the audio signal down the line. These are in  
close proximity and therefore pick up the same hum or  
interference. At the input, the inverted (-) signal is flipped  
back and mixed with the original, canceling any hum or  
interference.  
max-  
#2.Too much gain, distorted sound  
Noise  
Noise is typified by a hissing sound. It is present in all  
analogue electronics due to random thermal vibration of  
atoms within the components. However, good circuit  
design and proper operation reduces this to a minimum.  
Gain structure, i.e. how gain is set throughout the signal  
path, is very important in minimizing noise. Most audio  
signals go through several gain stages such as input trim,  
fader gain, main fader gain, EQ and compressor gain,  
and power amplifier gain. If the signal is boosted early on  
to a high level, any noise subsequently picked up will be  
relatively small in comparison to the audio signal (i.e.  
higher S/N, or sound to noise ratio).  
Since all the inputs of the Numark amps are balanced,  
accepting signals from a balanced output is no problem.  
Should the output be unbalanced, the cable should be  
wired as follows to ensure the best possible performance.  
This applies to XLR, 1/4” and barrier strip inputs alike:  
amplifier inputs  
If the gain is low early on, the noise will be  
relatively loud compared to the signal. When  
amplified at the power amp more gain must be  
used to make the signal reach required levels.  
This gain also acts on the noise, hence a noisier  
final sound. Of course, care must be taken not to  
set the gain too high, this will cause clipping  
distortion (see first section on Gain’).  
unbalanced output  
+
-
GND  
+
GND  
Where  
is a variable resistor, adjustable between 0 and 600 ohms.  
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The variable resistor is to ensure an impedance balance  
between the positive and negative inputs, and should be  
adjusted until any hum is at a minimum.  
damping factor of 67. Increasing the cable length to 320ft  
of 8 gauge, the losses are 5% and the damping factor is  
just 18.2.  
Balanced lines are also the most effective means of  
reducing or eliminating RF or radio frequency  
interference. Long unbalanced cable runs are likely to  
pick up radio signals. While these will be at a low level,  
they can be easily audible once they are amplified  
through a gain stage. This also applies to inputs to your  
mixer, so use balanced inputs wherever possible.  
Overload  
It may seem an obvious point to make, but overloading  
speakers can permanently damage them, so care should  
be taken to select speakers capable of handling the rated  
power output and peak output of the amp. If the system  
uses a crossover, ensure that the high frequency  
tweeter’ cabinets are not driven with signals of a lower  
frequency than they are designed for, either by wrongly  
setting the crossover, or by hum which appears in the  
amp or anywhere between the crossover and the amp.  
Losses Due to Cable Runs  
To connect the speakers to the amplifier, some type of  
cable must be used. This cable must be able to carry the  
signal some distance with the minimum amount of  
degradation along the way. Unlike earlier stages in the  
audio chain, the signal is at a relatively high level,  
therefore it is relatively immune to noise, RF interference  
and hum. However, power losses and a reduction in  
damping factor (the ability of the amp to control the  
speaker accurately) can occur, and these depend on a  
number of factors:  
Another overload which should be avoided is that of the  
human ear. Observe health and safety regulations where  
necessary regarding levels and exposure times.  
Bridged Mono Operation  
The amp comes factory configured for stereo operation. In  
this mode, each channel drives a separate speaker load  
with a separate signal. However, in some  
circumstances, it may be necessary or desirable to drive  
a single load at a higher level. This can be achieved  
using the amp in bridged mono mode.  
·
cable gauge - the higher the gauge, the smaller the  
cross section of each conductor in the wire. This  
gives the signal more resistance and therefore results  
in more power loss and a reduction in damping  
factor. For best performance use 8, 10 or 12 gauge  
cables as opposed to 16 or 18 gauge.  
What this essentially does is uses one signal in positive  
polarity through one terminal and negative through the  
other. The combined voltage across the terminals is then  
twice what it would be between a positive terminal and  
speaker ground (0 V). This is like two cars driving  
towards each other at 50mph; the relative speed between  
the two is actually 100mph.  
·
·
cable length - the longer the cable, the higher the  
losses. For best performance use the shortest  
possible cable (i.e. dont use a 100ft cable to connect  
to an amp that is only 20ft from the speakers).  
speaker load - a 4 ohm load will have double the  
power loss associated with an 8 ohm load and half  
the damping factor.  
Note that in this way, a load of twice the impedance can  
be driven at twice the power compared to stereo  
operation (see specifications).  
The difference that these factors can make is significant.  
For example, a Numark amp with 5ft of 12 gauge cable  
and an 8 ohm load will have a power loss of 0.2% and a  
damping factor of 142. The same load with a 40ft, 10  
gauge cable will have a power loss of 1% and a  
In order to configure your Numark amplifier for bridged  
mono operation, follow the instructions listed under  
bridged mono, 10 in each amplifiers description (front half  
of manual).  
CAUTION  
The speaker outputs of the Performance Series can be  
high enough to constitute a shock hazard (especially in  
bridged mono mode). Always make speaker connections  
with the power off, and ensure that there are no loose  
strands to cause short circuits.  
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Hook up #1 Home Studio Reference Amplifier  
mixer  
outputs  
AMLIFIER PUTS  
AMPLIFIER OUTPUTS  
CH-2  
CH-1  
+
CH-2  
CH-1  
CH-2  
CH-1  
-
+
-
-
+
GND  
Numark amplifier  
power  
reference monitors  
Hook up #2 Mobile DJ Stereo PA  
Numark mixer  
main outputs  
AMPLIFIER OUTPUTS  
AMPLIFIER INPUTS  
C-2  
CH-2  
CH-1  
+
CH-1  
CH-2  
CH-1  
-
+
- GND-  
+
Numark amplifier  
power  
speakers  
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Hook up #3 Monitor Amplifier (in bridged mono)  
mixer  
Zone/Booth send  
AMPLIFIER INPUTS  
AMPLIFIER OUTPUTS  
CH-2  
CH-1  
+
CH-2  
CH-1  
CH-2  
CH-1  
-
+
-
-
+
GND  
Numark amplifier  
power  
monitor speaker  
Hook up #4 Stereo PA System  
mixer  
outputs  
compressor or equalizer  
inputs  
outputs  
AMPLIFIER OUTPUTS  
AMPLIFIER INTS  
C-2  
CH-1  
+
CH-2  
CH
CH-2  
CH-1  
-
+
-
-
GND  
+
Numark amplifier  
power  
speakers  
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Specifications  
SA9500  
SA5500  
SA3000  
Frequency response  
(8 ohms , 20Hz - 20kHz @ 1 W)  
+0, -1dB  
0.1%  
+0, -1dB  
0.1%  
+0, -1dB  
0.1%  
Total harmonic distortion  
Signal to noise ratio  
Slew rate  
102dB  
20V/uS  
>200  
102dB  
20V/uS  
>200  
102dB  
20V/uS  
>200  
Damping factor  
Crosstalk  
80dB  
80dB  
80dB  
Rated power  
(per channel RMS Watts, both channels driven)  
2 ohms,1kHz,1% THD  
4 ohms, 1kHz, 1%THD  
1000W  
650W  
400W  
550W  
480W  
270W  
300W  
240W  
150W  
8 ohms,1kHz,1% THD  
(bridged mono operation)  
4 ohms,1kHz,1% THD  
8 ohms,1kHz,1% THD  
2000W  
1300W  
1100W  
850W  
540W  
420W  
Input sensitivity  
8 ohms, 1kHz @ rated power  
fixed voltage gain  
1.22 V RMS  
34dB  
1.22 V RMS  
31dB  
1.22 V RMS  
28dB  
Input impedance  
unbalanced (inverting polarity) @ 1kHz  
balanced @ 1kHz  
10k ohms  
20k ohms  
10k ohms  
20k ohms  
10k ohms  
20k ohms  
Protection circuits  
load short protection  
load short: current limit  
1.0 ohms  
4.5 A  
1.0 ohms  
4.5 A  
1.0 ohms  
4.5 A  
Power consumption  
Power requirements  
1050W  
750W  
400W  
115V / 60Hz, 220V / 50Hz,  
240V / 50Hz  
(depending on country)  
Residual noise 8 ohms, volume at min.  
0.4mV  
0.1%  
0.4mV  
0.1%  
0.4mV  
0.1%  
Intermodulation distortion 8 ohms, 1kHz @ 1W  
Dimensions  
mm  
inches  
480 x 132 x 435  
19 x 17 5/8 x 5 1/4  
480 x 87 x 435  
19 x 17 7/16 x3 1/2  
480 x 87 x 435  
19 x 17 7/16 x 3 1/2  
Weight  
Net kgs (lbs)  
Gross kgs (lbs)  
18.5 (40)  
20 (44)  
14.4 (33)  
17 (35.2)  
12.5 (27.5)  
15 (29.7)  
E & OE. Due to continual product development, all features and specifications subject to change without notice.  
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Block Diagrams  
clip/limit  
detector  
short circuit  
protection  
+
-
+
-
SA5500  
limiting  
attenuation  
clip/limit  
protect  
GS  
level  
voltage  
amp  
current  
amp  
ch1 inputs  
DC fault  
thermal  
power on/off  
+
+
ch1 outputs  
-
-
protection  
+
-
GC  
limiter on/off  
bridged mono  
stereo  
gnd  
ch1 sig  
protect  
-
+
clip/limit  
detector  
short circuit  
protection  
clip/limit  
DC fault  
thermal  
ch2 outputs  
ch2 inputs  
power on/off  
protection  
level  
voltage  
amp  
current  
amp  
limiting  
attenuation  
+
+
-
+
+
-
-
-
ch2 sig  
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Professional Disc Jockey Products  
LIMITED WARRANTY  
Numark Industries, LLC and Numark International, Inc. (hereafter “Numark”) warrants each new amplifier  
manufactured and/or supplied by it to be free from defects in material or workmanship under conditions  
of normal use and service for 3 years, beginning on the date of purchase from an authorized Numark  
Dealer, but not to exceed 4 years from date of shipment by Numark.  
The Numark obligation under this warranty is limited to repairing or replacing, at its option, the product or  
part(s) therein; which upon examination by Numark shall appear to be defective or not up to factory  
specifications; providing the Numark product is returned (transportation prepaid) to Numark.  
Numark shall not be liable for any damages, consequential or otherwise, resulting from the use and  
operation of this product and makes no other warranty(s) either express or implied on this product,  
including any warranty of merchantability.  
This warranty does not extend to any of our products which have been subjected to misuse, neglect,  
accident, incorrect wiring not our own, improper installation, or use in violation of instructions furnished  
by us, nor extended to units which have been repaired or altered outside of our factory, nor to cases  
where the serial number thereof has been removed, defaced, or changed, nor to accessories used  
therewith not of our own manufacture. Numark reserves the right to make changes or improvements in  
its products, during subsequent production, without incurring the obligation to install such changes or  
improvements on previously manufactured equipment.  
To place this warranty into effect, the enclosed WARRANTY REGISTRATION CARD must be returned  
to Numark Industries, LLC within thirty (30) days after date of purchase.  
This warranty gives you specific legal rights, and you may also have other rights which vary from state  
to state. Some states do not allow the exclusion or limitation of incidental or consequential damages so  
the above limitation or exclusion may not apply to you.  
SERVICE INFORMATION  
In the unlikely event of a product defect or if your equipment ever needs factory service, please call  
(401) 946-4700 and request a return authorization number. Packages sent without an RA number will be  
refused. Send the product to be repaired in its original packaging by insured prepaid freight to the  
address below. We cannot guaranty the safety of your equipment if it is not properly packed.  
If the product is no longer covered by warranty we will still repair the unit, however you will be subject to  
charges for parts and labor. We will contact you by phone or fax to inform you of the charges and you  
can prepay by check or have your repaired unit returned to you C.O.D. (including shipping charges).  
NUMARK INDUSTRIES, INC.  
11 Helmsman Road  
North Kingstown Rl 02852  
USA  
Attention: Service Department  
Telephone:(401) 295-9000  
Fax: (401 ) 295-5200  
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