Pro Audio Design Forum

Three relays sounds better than nine.

Edited:

I think we'll have to explain why there are two bypass options but having half hardware does eliminate a lot of cascaded stages when the M-S gizmo is not being used.

OK, that gets us down to one DPDT relay.

This thing almost has to come up to a patchbay anyway so you can get to the M-S process inserts.

I'd still put extra tie points to bridge C and F (4 points total).

Actually there's no logic involved - just the switches as shown with solo audio flowing through them. I didn't mean to use logic in the "digital" sense. If the pads for them were put in there, they simply become auxillary tie points on the board. The only one where I might suggest a relay ...

What about just putting in pads for a mute switch on the both the M and S channel?

Thanks Paul. That does seem to make more sense. It would only allow post-processing monitoring though. Wouldn't you want to hear mid (or side) both pre and post? Or, would you do that switching in the processor?

Here's the solo switching logic:



https://www.ka-electronics.com/Images/j ... iagram.jpg

There can be destructive solo, non destructive or both...

The "to 1646" lines lead to the final outputs.

I don't think so since the whole thing will probably be patched in when needed and removed when not. I may be wrong about that though and defer to Paul and Doug. FWIW the solo output could probably be mono. Three switches would be required for that: Mid/Side, Pre/Post and solo On/Off. If destructive...

Thanks Doug. Speaking of quick morning scans here's this: https://www.ka-electronics.com/Images/jpg/M-S_Flow_Diagram.jpg https://www.ka-electronics.com/Images/jpg/M-S_Flow_Diagram.jpg This is the basic flow diagram of the combined encoder/decoder. Notice the interstage points labeled A-H. Bypass dis...

Thank Paul - I'll draw us a quick picture in a little bit so we're all reading from the same page. Fortunately the scheme I'm proposing is the simplest too.

JR -

The 22 kHz BW noise performance is about the same comparing a 2162 to a 2181 around -98 at 0 dB gain.

The primary difference is THD performance with the larger-geometry parts being better.

IIRC correctly the output C was 3 pF vs. 15 pF.

Wayne

Roger - The half bypass system used in the Pico Compressor works fine. In that situation we don't have to maintain 0.02 dB gain accuracy. In the matrix I'm not concerned by the load of the line receiver but the load on the line driver on the insert send by the external processor. This only applies i...