Pro Audio Design Forum

I was thinking it might help you make that sausage faster without having to patch in that EQ and compressor to fix what the EE took away. It would basically have a single knob like an EE: Out, 75, 150, 300 etc. For in phase it would act like an EE. For out of phase more like the original LF was mono...

The dynamic nature of the filter makes it more audible than a simple EE IMO. Conceptually it seems better, like it would only do what is necessary and get out of the way when it's not necessary. In practice having the filter cutoff move around mostly serves to make it more audible. That is of cours...

Thanks Paul for checking in. I'll pore over those docs. What I think you may have missed in this thread as it eventually evolved is that the technique I'm showing here doesn't actually use MS. It just uses the MS board. In fact Mid isn't used at all. The first experiment I ran was to HPF Side in MS....

The schematic below shows how the decode section of the Precision MS Matrix board can be used to emulate the Neumann VAB84 with a fixed frequency filter and optional increased slope. The VAB84 and this implementation are both different from the EE70 and E77 which eliminate low frequency difference ...

I found a second way to do this externally as an insert to the MS matrix. The circuit I'm testing right now is second order with a high cutoff. There is virtually no separation below 200 Hz; at 1 kHz its about -25 dB. On a lot of material - already mastered - I can't hear it working which I suppose ...

VAB84 Description and Schematics I found the English technical description and schematics for the VAB84 and it confirms the different method it uses over prior generations of "Elliptical Equalizers." https://proaudiodesignforum.com/images/jpg/Neumann_VAB84_Matrix_Block_1.jpg Nuemann VAB84...

I'll post links to the full schematics. I want to re-tile the E77. I'm finding out what a "Swiss Army knife" the MS board is. It looks like everything up to the VAB84 was 6 dB/octave and by virtue of blending cancelled LF Side information rather than fold it into Mono/Mid like the VAB84. I...

I've looked at the VAB84 again and realized that it is a completely different animal than the LF blending of earlier Neumann "elliptical equalizers." Phase and polarity differences (Left relative to Right) are what make stereo. Pan something hard Left and the Side information will be the ...

the old school phono carts had 20-30 dB L-R separation. I think those are reasonable numbers. Lets use -30 dB to keep numbers round. I think I may have seen a 35 dB figure quoted once in a review and was astounded. The 20 Hz -3dB filter in the OP provides ~ -42 dB of separation at 1 kHz. An 80 Hz f...

I don't think the 150 and 300 Hz labels were the -3dB frequencies... I'm thinking those panel markings may have been "x" amount of separation at the marked frequency. That high a frequency (for a -3 dB point) and at 6 dB octave there would be no mid-band separation. I did see one post wher...