Rane ECM 64 - Manual (Page 12)

Manual-12
Alignment Procedure
Quick Overview
a. Setup Mic gains
b. Setup Line In and Aux In Input levels
c. Select matrix routing and if necessary the matrix level
d. Adjust the output levels
e. Select the input mix for the acoustic echo canceller.
f. Select the reference for the acoustic echo canceller.
Mic Setup
The ECM 64 is shipped with its Mic gains set for 34 dB and Mic trims set to +6 dB. If using boundary-type mics, this setting
may be good enough. To improve on this setting it is best to use a sound level meter like the Radio Shack 33-2050.
1. Remove the front security cover.
2. On the rear select the correct function for phantom power. Shipped with phantom power on.
3. Select the front panel gain setting. Typically 34 dB. Shipped in the 34 dB position.
4. Start with Mic 1 and mute all other mics.
5. Set Meter to Mic Mix.
6. Make certain that this is the correct mic by tappin on it. The Meter should go about full scale. If not, recheck mic wiring.
7. Place the sound level meter next to the mic and point both towards the loudspeaker.
8. Route the Pink Noise to Out 1 and adjust the amplifier level for 80 dBA, using the slow response on the sound level meter.
9. Adjust the Mic Trim so that the 0 dB LED on the ECM 64 meter just comes on.
10. Turn off the pink noise source. Go to step 4 and replace Mic 1 with next mic.
Troubleshooting
POWER LED is Off:
Check POWER connection on rear panel, and that the remote supply is connected to a live AC source.
No communication between the unit and computer:
Set the DEVICE ADDRESS to a unique small number, and try polling for units in RaneWare (under Device > Poll). The unit
should be found quickly.
Check that the COM port selected in RaneWare (under Setup > System Setup) is the one on your computer that is con-
nected to the unit. Also check that the cable is a standard RS-232 cable (not a null modem type). If an adapter is used, it must not
be null modem. The cable must be connected to the RW 232 INPUT jack on the rear of the unit.
Audio hum or noise:
Try Muting the unit. If this helps significantly, the problem may be with the Input connection, or the equipment driving the
Input. If Muting has little effect, the problem is likely either the Output connection, or equipment driven by the Output.
The ECM 64 is intended to connect to equipment with balanced audio I/O and chassis-grounded shield/common. This kind
of audio interconnection should maximize audio quality. Connecting equipment with signal grounded shields or unbalanced
connections may result in hum or noise due to induced currents in the signal path. It may be possible to reduce or eliminate these
problems, although some experimentation may be required:
Try disconnecting the audio cable shields at one end, particularly between chassis grounded and signal grounded equipment.
Try combinations of lifting grounds on units supplied with ground lift switches (or links).
Verify that all chassis are tied to a good earth ground.
Some units with outboard power supplies do not ground the chassis through the line cord. Make sure these units are
grounded by tying the Chassis Ground Point to a known earth ground. A star washer guarantees proper contact. For more
information on balanced interconnection and grounding, please refer to RaneNote 110, “Sound System Interconnection” or
Journal of the AES Vol. 43 No. 6 (June1995).