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If you're using the Sonamp 2120T MKII with a THX
processor, set the Level Controls to their maximum clockwise rotation to take
full advantage of the processor's calibrated volume control settings.
A.C. ON LED
( Figure 1 , #3)
This red LED indicates that the amplifier's AC power cord is plugged into a
live AC outlet. If the amp's main AC line fuse ever opens, this LED will go out.
To use the Auto-On feature, this LED must remain on at all times (i.e., with
an unswitched outlet). The Power Switch has no effect on this LED.
Active LED
( Figure 1 , #2)
The primary function of this LED is to show amplifier operational activity. In
the Auto-On mode, this LED turns ON at the presence of an audio signal to
the input jacks. The first time AC power is applied to the 2120T MKII, the
Active LED will illuminate for about 3 minutes and then extinguish. This is a
normal reaction of the Auto-On circuitry the very first time it receives power.
Thereafter, the 2120T MKII is ready for Auto-On operation.
Whenever AC power to the Sonamp 2120T MKII has been interrupted, the
Active LED will again illuminate for about 3 minutes when power is first
restored to the amplifier.
Note: When the Auto On feature is defeated the Active LED functions as a
conventional on/off power indicator.
High-Pass Filter Settings
The 2120T MKII high-pass filters are located on the circuit board just behind
the input/output jacks. The filter settings are determined by the positions of a
pair of shorting sleeves on jumper pins.
IMPORTANT: The high-pass filter jumpers are set at the factory in the
high-pass filter ON position. Sonance HIGHLY RECOMMENDS that these
jumpers remain in the ON position if the amplifier will be used in a system
that includes in-wall volume controls for the speakers. The amplifier's
high-pass filters reduce infrasonic energy and help protect autoformer-
based volume controls from saturation and overload.
To bypass the high-pass filters, set the jumpers to the OFF position:
1. Unplug the amplifier's power cord from the AC outlet.
2. Remove the amplifier's top cover.
3. As shown in Figure 2 (next column), remove the shorting sleeves from their
factory-set (ON) position on the Hi-Pass Filter jumper pins and replace
them in the OFF positions. Make sure you insert the shorting sleeves all the
way onto the jumper pins.
4. Replace the amplifier's top cover
PROTECTION CIRCUITS
The 2120T MKII has several circuits designed to protect the amplifier from
damage. If any are triggered, the Active LED will flash and you may hear the
sound of the protection relay clicking to protect the amplifier. After the fault
has been corrected, the amplifier will automatically reset itself for
normal operation. But it is advised that you turn off the amp's Power Switch
while you are trouble-shooting for shorted connections or faults with source
components.
MAINTAINING YOUR SONAMP 2120T MKII
To keep the 2120T MKII clean use only a soft cloth and never use any solvents
or abrasives. Fingerprints may be removed with a soft cloth moistened only
with a few drops of water.
®
-certified surround
( Figure 2 )
I N S T R U C T I O N M A N U A L
S O N A M P
S T E R E O P O W E R A M P L I F I E R
Figure 2: Hi-Pass
Filter Jumpers
SPECIFICATIONS
Both Channels Driven
Output Power, Stereo mode, RMS:
IHF: Dynamic Power
Dynamic Headroom:
Total Harmonic Distortion:
I.M. Distortion (SMPTE 4:1) @ 8 ohms:
Frequency Response:
Hi-Pass Filter Characteristic:
Signal to Noise Ratio:
Input Sensitivity:
Input Impedance:
Power Consumption
Dimensions:
Shipping Weight:
4
2 1 2 0 T
®
120 Watts per channel @ 8 ohms;
160 Watts per channel @ 4 ohms
163 Watts per channel @ 8 ohms;
242 Watts per channel @ 4 ohms
+1.33dB @ 8 ohms;
+1.79dB @ 4 ohms
0.05% (20Hz – 20kHz @ 8 ohms, 120 WRMS);
0.10% (20Hz – 20kHz @ 4 ohms, 160 WRMS)
0.01% (1kHz @ 8 ohms, 120 WRMS);
0.02% (1kHz @ 4 ohms, 160 WRMS)
0.02% @ 1 Watt;
0.02% @ 60 Watts
20Hz – 20kHz, ±0.25dB (Hi-Pass Filter OFF)
-1dB @ 57Hz; -3dB @ 28Hz
-100dB below rated output (A-weighted)
1.1 Volt for 120 watts RMS @ 8 ohms;
1.0 Volt for 100 watts RMS @ 8 ohms
47k ohms
750 Watts maximum (full power @ 4 ohms);
10 Watts idle (no signal)
3
5
16¾" x 5
/
" x 12
/
" (425mm x 137mm x 321mm)
8
8
26 lb (11.8 kg)
M K I I
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