Goldmund Stereo Amplifier SR150 User Manual

USER MANUAL  
GOLDMUND SR150 2-CHANNEL  
Universal Power Amplifier  
 
W
A
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!
No connection or manipulation must be  
done before reading those instructions.  
Damage to the amplifier may result if the  
following instructions are not consciously  
understood and applied.  
SR150 2-CHANNEL Universal Power Amplifier  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER  
 
CONTENTS  
1 UNPACKING  
p 4  
p 4  
2 CHOICE OF AMPLIFIER LOCATION AND COOLING  
3 LINE VOLTAGE ADJUSTMENT  
4 CONNECTIONS  
p 5  
p 5  
p 6  
5 AMPLIFIER CONTROLS  
6 SOUND QUALITY OPTIMIZATION  
Warm-up sonic effect.  
p 7  
Speaker polarity.  
Mains line phase inversion.  
7 SAFETY AND PRECAUTIONS  
Protection against DC.  
p 8  
Protection against short-circuits.  
8 MAINTENANCE  
p 9  
9 TECHNICAL DATA  
p 9 - 10  
Power  
Frequency response  
Analog input sensitivity  
Group delay  
Distortion  
Speed  
Noise  
D/A Converter  
Operating temperature  
Power supply  
Size and weight  
Warranty  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER  
 
UNPACKING  
1
2
You will find in the GOLDMUND SR150 box :  
K The amplifier  
K The power cord  
K This manual and the warranty card  
K Accessories and spare fuses  
Please keep the packaging in case you need to transport the amplifier at a later date  
or if you have to send it for maintenance.  
WARNING  
IF YOU NEED TO RETURN THE SR150 TO THE FACTORY OR TO YOUR LOCAL  
REPRESENTATIVE FOR A WARRANTY REPAIR, PLEASE NOTE THAT IT MUST BE  
REPACKED IN THE ORIGINAL PACKAGING.  
THIS PACKAGING HAS BEEN DESIGNED SPECIFICALLY TO PROTECT YOUR  
SR150 IN TRANSIT. USE OF ALTERNATIVE PACKAGING IS LIKELY TO RESULT IN  
DAMAGE, INVALIDATING WARRANTY COVER.  
CHOICE OF AMPLIFIER LOCATION AND COOLING  
The GOLDMUND SR150 amplifier, as all the high quality amplifiers may generate a large  
amount of heat if driven at high power.  
It is mandatory to allow a proper cooling of the heat sink. Avoid any location which is not  
properly ventilated and avoid putting other equipment on top of the amplifier.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 4  
 
LINE VOLTAGE ADJUSTMENT  
3
4
An AC line voltage selection is possible inside the chassis. Please ask your dealer for  
assistance if the line voltage provided is not appropriate.  
ATTENTION  
On the 220V position, the GOLDMUND SR150 amplifier will function properly for AC voltages  
between 200V and 245V.  
On the 110V position, the AC line must deliver between 95V and 125V. If your AC line is  
usually out of these tolerances, please consult your GOLDMUND dealer.  
Please check the value of the mains line fuse. This fuse is located in the power cord  
receptacle. The lid can be removed with a small screwdriver when the cord is removed.  
Use a 5A slow-blow fuse for 220V and a 8A slow-blow fuse for 110V.  
CONNECTIONS  
Check if volume control is down to zero on the preamplifier.  
If you are using analog inputs, connect the interconnects between the preamp/processor  
and each of the power amps inputs.  
If you are using a Goldmund Universal Preamplifier, connect a lineal digital cable between  
one of the preamp outputs and the amplifier digital input. Then change the amp switch back  
to digital input.  
Connect the speaker cables to the red and black terminals accessible at the back of the  
amplifiers.  
You may notice that the ground of the input and the black speaker terminal are of the same  
polarity. The amplifier is non-inverting in phase.  
Then, connect the power cords to the back of the amplifier and plug it in the nearest wall  
plug. Use a 3 lugs grounded plug, for safety reasons. To get the best sound of the amplifier,  
avoid any multiple plug or extension cord.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 5  
 
AMPLIFIER CONTROLS  
5
On the front plate of the GOLDMUND SR150 amplifier you will find only one switch:  
The POWER key, used to power the amp on and one power Led.  
When turned ON the 2 channels are immediately connected and the front panel POWER Led  
lights up. If you use the digital input, the lock of the digital input will indicate this by changing  
the Led from green to yellow.  
The amp may be powered off by turning off the POWER switch at any time. The Led will fade  
very slowly, indicating discharge of the filter capacitors. The speakers will be disconnected  
after a few seconds.  
It is absolutely normal that a slight sound is heard from the speakers when the amplifiers  
are turned ON or OFF. The SR150 is self-protected and the sound heard is corresponding to  
the charging and discharging of the capacitors.  
On the back panel, there is a 5 Switch set which allows adjusting the D/A Phase and  
Gain for the digital input.  
Each Switch has 2 positions : ON (high) and OFF (low)  
Phase adjustment:  
Switch 1 (rightmost)  
ON: 180  
OFF: 0  
Left Gain  
- 6dB:  
0dB:  
Switch 2: ON  
Switch 2: OFF  
Switch 2: ON  
Switch 2: OFF  
Switch 3: ON  
Switch 3: ON  
Switch 3: OFF  
Switch 3: OFF  
+6dB:  
+12dB:  
Right Gain  
- 6dB:  
0dB:  
Switch 4: ON  
Switch 4: OFF  
Switch 4: ON  
Switch 4: OFF  
Switch 5: ON  
Switch 5: ON  
Switch 5: OFF  
Switch 5: OFF  
+6dB:  
+12dB:  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 6  
 
SOUND QUALITY OPTIMIZATION  
6
K Warm-up sonic effect  
If the power amplifier has not been powered on for a few days, the optimum sound quality  
is reached after 15 minutes. This delay has been optimized to be minimal and the sonic  
quality when just powered on is much higher than other quality power amplifiers.  
K Speaker polarity  
Even if you have an absolute phase inverter on your preamplifier (Mimesis 22M), and even  
if you have carefully selected the proper line phase (see in next paragraph), there is a  
possibility to again increase the sonic quality of your speakers by reverting the polarity of  
each speaker cable at amp termination. But since the line phase and the speaker polarity  
interfere to each other, you have to experiment carefully with all the combinations before  
picking the right one.  
If your preamplifier has an absolute phase inverter, this will interfere too. If it has not, don't  
forget the result will depend on the source, as most records and CDs have been recorded  
without care for the absolute phase. Be patient…  
K Mains line phase inversion  
The sonic quality of your GOLDMUND SR150 can be greatly improved if the mains AC line is  
properly connected. Try to invert the AC plugs of both your amplifiers, using special adapters.  
We recommend that you try this carefully. You must do it in combination with the speaker  
polarity and/or with absolute phase switching to be sure of the best result.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 7  
 
7
SAFETY AND PRECAUTIONS  
ATTENTION  
The GOLDMUND SR150 is an extremely high speed amplifier.  
Any bad ground connection can generate high frequency oscillation which is  
dangerous for tweeters.  
It is also generally dangerous to run analog input cable and speaker cables in parallel for a  
long distance. If these cables are not of high quality or badly shielded, an “Antenna-Effect”  
can generate dangerous high-frequency oscillations.  
K Protection against DC  
The GOLDMUND SR150 is a DC-coupled amplifier. Without protection and if it is associated  
with a badly designed or defective analog preamplifier (often true for tube preamps and  
some 5 channel processors), the speakers could easily be damaged by the amplified DC.  
The SR150 protects itself from such an accident by a feedback DC control that limits the DC  
amplified by the circuit.  
This protection circuit is totally transparent and has no sonic effect.  
K Protection against short-circuits  
If one output is short-circuited by accident the amplifier self-limits its output so the current  
doesn’t become too high.  
However, such accidents should be limited over time to avoid excessive heat build-up  
occurring. In extreme cases, such mishandling could destroy the amplifier, which is not  
covered by the warranty.  
There is no risk to leave the speaker terminals unconnected when the amps are on.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 8  
 
MAINTENANCE  
8
9
The GOLDMUND SR150 amplifier usually requires no maintenance.  
To clean your SR150 use a very soft, clean, damp cloth to avoid scratching the surface.  
Dampen with water or a mild detergent solution. Avoid abrasive or harsh cleansers (eg.  
products containing sodium carbonate). Always turn the power off before cleaning your  
amplifier.  
TECHNICAL DATA  
POWER  
• Nominal power before clipping: 2x200 W RMS (2 - 8 Ohms). 150 W RMS (1 - 16 Ohms).  
• Maximum power : > 400 W RMS (3 Ohms).  
• Maximum voltage : 55 V peak. - Maximum current : > 15 A peak.  
These values are for both driven channels.  
FREQUENCY RESPONSE  
These figures are valid for the circuit alone, at any level between 0 and nominal power.  
• +/- 0.1 dB, 10 Hz - 1 MHz.  
• +/- 1 dB, 6 Hz - 1.2 MHz.  
• +/- 3 dB, 3 Hz - 1.4 MHz.  
ANALOGUE INPUT SENSITIVITY  
• Nominal level : 0.75 V.  
• Input impedance : 50 kOhms.  
GROUP DELAY  
Propagation delay < 100 ns stable with frequency from DC to 200 kHz.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 9  
 
TECHNICAL DATA  
9
DISTORTION  
Figures valid for all levels from 0 to 20 V / 8 Ohms.  
• Dynamic : TID < 0.01 % (- 80 dB).  
• Static : THD < 0.01 % (- 80 dB).  
SPEED  
• Slew rate : > 240 V/us  
• Rise time : < 260 ns.  
NOISE  
• Weighted ASA A : > 100 dB.  
D/A CONVERTER  
• Using a plugged-in Goldmund Alize4 2-channel D/A module protected against static.  
OPERATING TEMPERATURE  
• Room temperature : -30 to +40 degrees Celsius ( -22 to +104 degrees Fahrenheit).  
• Internal temperature : +45 to +65 degrees Celsius ( +113 to +149 degrees Fahrenheit).  
POWER SUPPLY  
• Nominal line voltage : 117 or 234 V.  
• Input voltage range : +/- 15 %.  
• Maximum power consumption : 450 W.  
SIZE AND WEIGHT  
• 44 cm W x 33 cm D x 9 cm H. - Weight : 13 kg net.  
WARRANTY  
• 3 years parts and labor.  
User manual - SR150 2-CHANNEL UNIVERSAL POWER AMPLIFIER | P 10  
 

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