ETI Sound Systems, INC US-1200 Stereo Amplifier User Manual


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THE BEAUTY OF POWER
B-52 US Series Professional Power Amplifiers - Instruction Manual
US SERIES AMPLIFIERS
MODE SELECT:
STEREO MODE
InSTEREOmode,bothchannelsoperateindependently,withtheirrespectiveinputgain
controls. Signal at the Channel 1 input produces output at Channel 1, while the signal
at Channel 2 input produces output at Channel 2. The minimum load impedance for
STEREOoperationis2Ohmsperchannel.
PARALLEL MODE
WhensettoPARALLELmode,asignalappliedtoChannel1’sinputwillbeamplied
and appear at both of the Channel 1 and 2 outputs. The level control knobs will oper-
ateontheirrespectivechannels.Channel2’sinputisinactiveinthePARALLELmode.
ThePARALLELmodeiswell-suitedforapplicationswhenyouneedtofeedtwospeakers
withthesamesignalbuteachspeakerispoweredbyitsownamplierchannel.Mini-
mumloadimpedanceforPARALLELoperationis2Ohmsperchannel.
BRIDGED MONO MODE
Bridged mono mode combines both amplifier channels to make a powerful single-chan-
nelamplier.Onechannel”pushes”andtheotherchannel“pulls”thesignalequally,
doubling the voltage. When the voltage is doubled, the power is quadrupled if the
same impedance load is used.
InaBRIDGEmode,thesignalmustbeappliedtoChannel1’sinputonlyand
Channel 1’s gain control is used to adjust the signal level. The gain control of Channel
2isnotusedandinput2isinactiveinBRIDGEmode.
NOTE:MinimumloadimpedanceinBRIDGEmodeis4Ohms.Connectinga
lowerimpedanceloadtotheamplierintheBRIDGEmodemaytriggerthe
protection circuitry. In some instances it may cause severe damage to the amplifier,
which is not covered by the warranty.
WARNING: MAKESURETHEIMPEDANCEOFTHESPEAKERSCONNECTEDIN
ABRIDGEMODEARENOTLOWERTHANSPECIFIED!!!
WARNING: Do not connect two 4 ohms subwoofers in parallel in BRIDGE mode,
as the total impedance halves in such a parallel connection. The total impedance
will be 2 ohms, and will cause constant overheating and distortion of amplifier. It
willalsocauseconstanttriggeringoftheACcircuitbreakerandcoulddamage
your amplifier.
NOTE:IntheBRIDGEmodeaspeakerisconnectedtobothofthechannels’
outputs and is not connected to the ground of the amplifier on both ends.
DONOTATTEMPTTOGROUNDYOURSPEAKER!
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