Ashly 3.24CL-d Manuel d'utilisation - Page 12

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Operating Manual - PROTEA SYSTEM II 3.24CL Crossover / System Processor

5. AUDIO CONNECTIONS

All Protea 3.24CL audio connections use three pin XLR jacks, with pin 2 (+), pin 3 (-), and pin 1(G). Inputs and

outputs are electronically precision balanced. If an unbalanced signal is fed to an input, the signal should be on the (+)

connection (pin 2) and pin 3 must be tied to ground, or significant signal loss will result. In other words, never float pin

2 or pin 3. It is strongly recommended that balanced signals be used whenever possible.

A Note About Input Signal Levels:

There are no analog gain trim adjustments on the Protea 3.24CL, therefore all the processing (including gain)

is done in the digital domain. As a consequence of this design philosophy, it is important to feed the Protea processor

with the proper nominal signal level to achieve good signal to noise performance as well as headroom before clipping.

The Protea 3.24CL is designed to clip at signal levels above +20dBu = 7.75Vrms which places the noise floor lower

than -90dBu. The optimum input signal level which should be fed into the Protea processor is 0dBu = .775Vrms. This

input level will allow 20dB of headroom while giving a nominal signal that is >90dB above the noise floor.

6. TROUBLESHOOTING

6.1 - Audio Troubleshooting Tips

No power - Is the detachable AC cord fully plugged in? Is the rear panel power switch on?

Controls don't work - check the Security Level. If set to Full Lockout, then Protea unit is "view only". Change

security settings in Util menu.

No sound - Check to see if the input or output is muted. Is the input or output Gain turned down? Check the

selected audio source(s) for each output, making sure there is signal applied to the designated input(s). If the crossover

is used, make sure the high pass filter (HPF) is set to a lower frequency than the low pass filter (LPF).

Clip light stays on - Is the input signal level too high? Check to see that the nominal input level is 0dBu, allowing

20dB of input headroom. Are input or output gain settings too high? Check to see if an EQ filter has too much boost.

Distorted sound but no Clip LED- Check individual EQ filters to see if there is excessive boost.

Muffled sound - If expecting full range audio on an output, make sure the crossover settings are not inadvertently

set so as to limit the pass band.

Excessive Noise - An input signal level or an input gain setting that is too low could require the loss to be made

up for at the output gain stage, producing more noise than a properly set up gain structure. Do not use the 3.24CL for

dramatic increases in level, but rather optimize the signal source for a nominal 0dBu output.

7. DIMENSIONS

(44.5)

1.75"

1.50"

(38)

(6.4)

0.25"

0.00

3.24CL

6.00"

(152)