81

CP4500 Stereo Bus Compressor / Re: CP45000 Bypass issue

« Last post by JPK on February 16, 2025, 05:52:26 PM »

Is this hapenning to both channels at the same time?
Do you hear the bypass relay clicking when it happens?
First thing to do would be to check the solder joints on the connectors CN1a, CN1b, CN2a, CN2b and on the threshold and makeup pots.

82

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by JPK on February 16, 2025, 05:42:22 PM »

Your amp has no volume control?
If not, you can place 2 attenuators between the MC624 and the amps.

83

CP4500 Stereo Bus Compressor / CP45000 Bypass issue

« Last post by radar.rohan on February 15, 2025, 11:48:23 PM »

Hey there, I posted about this a while ago but it fell off my plate!

Loving the unit. But I'm having an issue where intermittently the unit seems to fall into bypass even though it looks like it's all still working properly.

Lights still on and meter working etc, but signal unaffected. 

Drastically adjusting the gan pot or the threshold (particularly the gain pot) does seem to sometimes shock it into working again. But not consistently.

Any thoughts?

Thanks heaps for you help. Love to get it working as I'm loving it.

Cheers

84

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by audiosoldering on February 14, 2025, 04:24:00 PM »

Thanks for the test method.  We are a db between in and out.  I'm sure lowest attenuation will be fine for mixing.  Could it be possible to add an additional Pad if needed.

85

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by JPK on February 14, 2025, 11:39:13 AM »

To check that the unit is working do the following:
1. 
- send a low level audio signal (preferably a constant sine wave) to the input,
- set the level of the MC624 at 0dB, note the audio volume.
- bypass the MC624 completely and check that you get the same audio level.
2.
- send a strong audio signal (preferably a constant sine wave) to the input,
- set the level of the MC624 at -63dB, note the audio volume.
- Lower the audio signal by -63dB at the source,
- increase the level of the MC624 to 0dB and check that you get the same audio level than before.

86

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by audiosoldering on February 13, 2025, 10:47:55 PM »

Thanks for explaining the functions. 

Listening to a loud source, "Mastered Music," I find it to be 14db louder than some of my lowest listening levels when set to the maximum attenuation of -63. 

If I pull my DAW fader down an additional 42db then the signal is inaudible.  

87

MP573 Microphone preamplifier / Re: No DI input: what did I forgot in the calib prodedure? [SOLVED]

« Last post by JPK on February 13, 2025, 04:27:16 PM »

88

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by JPK on February 13, 2025, 04:26:11 PM »

Check that the in/out offsets are set to 0.
If one input or output is offseted by +5dB the the max level will be reached at -5 on the display.

89

MP573 Microphone preamplifier / Re: No DI input: what did I forgot in the calib prodedure?

« Last post by batchas on February 13, 2025, 02:10:34 PM »

I wanted to inform you that the DI input is now working.
I traced this morning a short between 2 points on the DI board. A tiny blob of solder between 2 pins on 2SK170 that I did oversee when cleaning the board.

90

MC624 Monitor Controller / Re: No function of -12db over inputs ans outputs

« Last post by audiosoldering on February 12, 2025, 03:53:40 PM »

Understood on the attenuation.   

When I run a tone into the input of the MC624 and back into my DAW I observe the following.

-63 on MC624 set to -63db db on daw meter.  A 1db increase is observed until -5.  After this, there are no more level increases or relay clicks. 

Thanks