AVSL Citronic PPX900 - Manual (Page 3)

PPX Series User Manual
Rear Panel
8. Cooling fan vent
9. CH1 & CH2 XLR inputs
10. CH1 & CH2 jack inputs
11. GROUND LIFT switch
12. MODE switch
13. LIMITER switch
14. CH1 & CH2 binding post speaker outputs
15. CH1 & CH2 SPK connector outputs
16. IEC mains inlet and fuse
Operation
Connect speaker cabinets to channel outputs using good quality leads via the SPK connector or binding posts and ensure
that the combined load on each channel is no lower than 4Ω. (for speaker loads connected in parallel, 8Ω + 8Ω = 4Ω)
Both channels can be used to drive a single load at the combined volume of each by switching to BRIDGE mode. In this
mode, the input is on channel 1 and output from CH1 SPK connecter (pins 1+ and 2-) or across the red “+” terminals as
indicated on the rear panel - WARNING - Minimum load for bridge mode is 8Ω
Connect each signal input from mixer or other line level source via the XLR or jack connectors on the rear panel using
good quality signal leads.
For protection in high power situations, the onboard LIMITER may be switched in to protect from overload.
In situations with excessive mains hum coming through the speakers, it may help to switch the GROUND to the LIFT
position. This is may help in some situations but otherwise, it is preferred to be switched to GND.
Jack and XLR inputs for each channel are wired in parallel, allowing the signal to be carried forward to further amplifiers
if necessary (if the input is XLR, the jack may be used as a signal output and vice versa)
Connect the amplifier to a mains outlet, ensuring that the IEC lead is earthed, in good condition and connected securely.
With channel gain controls turned fully down, switch on the power to the amplifier. This unit has a “soft-start” function
which makes some checks before engaging power to the amplifiers, which may take a few seconds.
With mixer (or other signal source) levels turned down, gradually increase the amplifier’s channel level controls to the
required level (normally full) and then gradually increase the signal level from the mixer or sound source until sound can
be heard through the speakers and then continue increasing up to the required level.
During use, green “SIGNAL” LEDs will illuminate to show when a signal is present and yellow “CLIP” LEDs illuminate if the
output is reaching clip level. If the red CLIP LEDs illuminate more than very briefly, reduce the volume until they hardly
light up at all.
If the internal protection circuitry detects a fault in the speakers or amp, the channel(s) will enter Protect Mode and red
“PROTECT” LEDs will illuminate on the front panel to show this. Switch the amplifier off and check the entire system
(including leads) before powering up again. If still in Protect Mode, seek advice from qualified service personnel.
Before powering down, turn the channel gain controls fully down to avoid loud noises when switching off.