Xtdt amplifiers – X-Treme Audio XTDT User Manual
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3.3 Front panel: controls and indicators
Fig.3 a) Front panel mod. XTDT3200 and XTDT3800
Fig.3 b) Front panel mod. XTDT4800F and XTDT6000F
1) Holes for the assembly
2) Holes for standard rack handles
3) Input attenuators
A precision attenuator for every channel with 21 positions allows
tuning of the amplifiers level for every channel.
Warning: when using a mono in bridge both level at-
tenuators A-B (C-D) should be set to the same position.
Please set them to position 0 dB.
4) Signal LED
Every channel has a LED bar that shows the input signal level.
Green LED shows the presence of a signal and level -20 dB, yel-
low -10 dB. Respectively: 0.1%, 1% and 10% of maximum power.
5) Clip/Limiter LED
Every channel has a LED that lights up at clip point and when the
limiter activates.
6) Protection LED
Protection LED that lights up when the load voltage is under 1 Ω
or the amplifier output has been short-circuited.
7) Exp LED
It indicates that an optional expansion board has been inserted.
8) Hi-Temp LED
It indicates when the dissipator temperature starts increasing. At
60 ºC the Hi-Temp LED will start flashing and the output power will
be gradually reduced. At 75 ºC the Hi Temp LED will remain lit and
A-B channels (mod. XTDT3200 and XTDT3800) or A-B, C-D (mod.
XTDT4800F and XTDT6000F) will go into mute until the tempera-
ture reaches normal level, resetting is automatic.
Warning: this condition usually occurs due to inadequate
ventilation clearance, please check thoroughly the ampli-
fier installation.
9) Active LED
It lights up to show that the amplifier is on and works properly.
10) Starting up push button
A soft-start system limits absorption when starting up.
11) Ventilation grid
Grid with sponge filters for proper ventilation of the amplifier and
to prevent dust infiltration.
Warning: do not block the ventilation entries.
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