Electro-Voice STEREO POWERED MIXER PSX2200 - Manual (Page 16)

55. POWER AMP STATUS indicators
These indicators inform you about the momentary operational status of the PSX’s internal
power amplifier.
The POWER ON indicator is always lit when the PSX is in operational mode. If the LED is not
lit after you have turned the power on, please make sure that the PSX’s power cable is correctly
plugged in. If this is the case and the LED is still not lit, please contact your dealer.
The LIMIT indicator signals that you are operating the PSX at the internal amplifier’s limit.
Frequent blinking of the LED is acceptable, since the amplifier’s incorporated limiter prevents
serious distortion. Continuous illumination indicates that you should be aware of a degradation
in sound quality. In that case, the master level should be reduced.
The PROTECT indicator is lit when one of the PSX ’s extensive protection circuits is guarding
against thermal overload, HF-induction, DC at the outputs, or short circuits is activated. When
the PSX is in protect mode, the speaker outputs are muted and the amplifier’s inputs are
shorted to prevent the amplifier from being damaged. In this case you should first check to
see if the ventilation louvres are blocked. Another cause could be that you have more than
three 8 ohm speaker systems per output channel connected. You should also disconnect the
SPEAKON output connectors and check the speaker cables for short circuits.
During normal power-on operation, the PROTECT LED always lights for about two seconds,
signaling that the PSX’s protection circuitry is operational.
56. PHANTOM POWER
When this switch is engaged, all MIC inputs are supplied with +24V phantom power.
Please make sure prior to engaging phantom power that the PSX is switched off or in
stand-by mode. With active phantom power the connection of unbalanced signal
sources (keyboards, mixer, etc.) to XLR inputs is not advisable, because this could
lead to severe damaging of your equipment.
ATTENTION! IMPORTANT NOTICE!
In general, the operation of phantom-powered condenser microphones and balanced
dynamic microphones at the same time does not lead to any problems.
Nevertheless, some balanced dynamic microphones are extremely sensitive to this.
Some models could get damaged when used on mixers with active phantom power.
Please refer to the microphones’ owner’s manuals to make sure that this operation is
permissible.
To be on the safe side, you should switch the PHANTOM POWER off, when using
balanced dynamic microphones, only.
57. 7-BAND EQUALIZER
The respective EQ ON switches activate each 7-band graphic EQ within the PSX’s master
section. The EQ’s insert point is post master fader and pre internal power amplifier. The EQ
is bypassed when the EQ ON switch is not locked in its “ON” position. The two graphic EQs
provide seven frequency bands, each. Through these faders you are able to match the overall
sound optimally to the acoustic conditions of different locations or shape it according to your
personal taste. Each frequency band allows ±10dB equalization in the corresponding range
with a Q=1.4.
MASTER
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