ETI Sound Systems, INC US-1200 Manuel D’Utilisation

THE BEAUTY OF POWER

Points to bolt your amplifier into a rack.

US-Series amplifiers are cooled by two rear-mounted 

fans (US-1200 has one fan) and open cell foam filters 

mounted behind the front vents.

 

CAUTION: Never block the front or rear vents  

 

and keep them clean at all times.

NOTe: Periodically clean the foam filters using a 

 

vacuum cleaner to avoid dust from blocking the 

 

vents. If the filters become too dusty, it may  

 

decrease your amplifier’s ability to dissipate  

 

and remove heat efficiently. If the filters become  

too dusty and too difficult to clean externally, you  

 

can access the filters and remove them for  

 

cleaning. Refer to the cleaning procedure later  

 

in this manual.

These two blue illuminated strips glow when your 

amplifier is turned ON.

Use these 21-position detented controls to adjust the 

output levels of Channel 1 and Channel 2. When 

the LEVEL controls are set fully counter-clockwise, the

signal is attenuated by more than 80dB (marked -∞). 

When the LEVEL controls are set fully clockwise, the

signal is amplified with maximum gain. When the

LEVEL is set fully clockwise, the amplifier produces

its rated output power at a 4 Ohm load with +4dBu

(1.23Vrms) signal applied to the inputs. All detents

are marked in dBs showing the attenuation of  

the output signal with reference to the fully  

clockwise position. 

NOTe: In PARALLEL MONO mode, both of the  

Channel 1 and Channel 2 LEVEL controls are  

 

used to adjust the signal level for their respective  

 

channels. The signal should be routed only to  

 

the Channel 1 input in this mode.

NOTe: In BRIDGED MONO mode, only the  

Channel 1 LEVEL control is used to adjust the  

 

signal level. The signal should be routed only to  

 

Channel 1’s input in this mode.

These green LEDs will illuminate indicating that a

signal is being received through the input and that 

the signal is being amplified. There are three LEDs on

each channel: SIGNAL, -20dB and -10dB.

These red LEDs will illuminate at the clipping  

threshold. If the CLIP LEDs light frequently, you are

overloading the amplifier, causing gross distortions 

on the outputs. Heavy clipping is bad for both your 

speakers and amplifiers and should be avoided.