Specifications

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10)Powerswitchandpowerled:iptheswitchtopowerontheamplier.Theblueledwilllightuptoindicate
that mains power is present.
11)Volumepotmeterchannel3:usethispotmetertopresetthevolume.Incasetheamplierhasbeenswitched
to bridge mode, this potmeter sets the level for bridge operation.
12)Signalledchannel3:thisledlightsupgreenwhenasufcientlystrongsignalispresentontherstchannel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal.Whenitlightsupredduringuse,thepowertransformerorpoweramplierisoverheatedorin
protectmodeandisshutdown.Turnoffthepower.The amplier will not turn on automatically after
most error conditions. In some cases, the user MUST turn off power and remove the overload and
then power on again !
13)APCactivityledchannel3:thisledlightsupwhentheAPCcircuitryisactive.TheAPCcircuitryreducesthe
gainattheinputstoguaranteethefulldynamicrangeofthepowerampliercircuits.
14)Clipledchannel3:thisledlightsupwhenevertheamplierclips.Thisisawarningsign:youarepushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led
never lights up anymore ! Don’t ignore this !
15)Bridgeled:thisledlightsuptoindicatethattheamplierisinbridgemode.
16)Signalledchannel4:thisledlightsupgreenwhenasufcientlystrongsignalispresentontheleftchannel,
after passing the input level control. At startup, the led will light up red during a few seconds, this is perfectly
normal.Whenitlightsupredduringuse,thepowertransformerorpower
amplierisoverheatedorin
protect
modeandisshutdown.Turnoffthepower.The amplier will not turn on automatically after
most error conditions. In some cases, the user MUST turn off power and remove the overload and
then power on again !
17)APCactivityledchannel4:thisledlightsupwhentheAPCcircuitryisactive.TheAPCcircuitryreducesthe
gainattheinputstoguaranteethefulldynamicrangeofthepowerampliercircuits.
18)Clipledchannel4:thisledlightsupwhenevertheamplierclips.Thisisawarningsign:youarepushing
things a little too far or you are overloading the amp. Reduce the input level by a few dB so that this led
never lights up anymore ! Don’t ignore this !
19)Volumepotmeterchannel4:usethispotmetertopresetthevolume.Inbridgemode,thispotmeterhasno
function.
Note : signal leds 2, 6 , 12 and 16 have multiple functions: during the rst few seconds of startup they
light up red, this is perfectly normal. When a strong audio signal is present on the amplier circuit,
the leds light up green. When an error occurs during operation, they will turn red to indicate an error
condition and the speaker relays will switch off automatically. Possible causes can be : amplier error
or DC on the output, amplier overheat or transformer* overheat. In such cases, remove the error
condition or overload and wait until the unit has cooled down before powering on again.
*Incasethetransformerisoverheated,itmaytakealongtimebeforetheamplierhascooleddownsufciently.
Insuchcases,youmayhaveoverloadedtheampliertoomuch.Powerofftheamplierimmediately,correctthe
errorandwaituntiltheamplierhascooleddown.