Search found 660 matches

by Gold
Mon Jan 04, 2021 12:26 pm
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

I'd argue that's not that stupid. First, you can easily make an XLR to double BNCs break-out. I use 5 pin XLR’s for stereo connections. I’d either have to stuff four BNC cables into an XLR housing or build a breakout box with XLR’s and binding posts. I would much rather see binding posts than a tot...
by Gold
Mon Jan 04, 2021 11:49 am
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

AD2, while useful, is not that low noise (but ok for general purpose work). You may check QuantAsylum QA401. This is the most affordable and versatile analyzer that I found (and use regularly). The first QuantAsylum was unbalanced so pretty useless for pro audio. The ne one is balanced but uses a p...
by Gold
Mon Jan 04, 2021 10:58 am
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

Paul - Now that you've got a Windows machine get a Focusrite 2i2 (USB) and a licensed copy of AudioTester. Your total outlay will be about $200. I have an Native Instruments interface. I could try Audio Tester. Maybe l’lI like it better than REW. I find having to check calibration every time really...
by Gold
Sun Jan 03, 2021 12:06 am
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

I won't debate personal subjective preferences for inaccuracies, BUT on the subject of null testing, nulling an artifact rich d.u.t. vs a clean reference path allows you to isolate those differences (artifacts?) I wasn’t looking for a debate. I think the most popular spot for a transformer in pro a...
by Gold
Fri Jan 01, 2021 1:25 pm
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

JR. wrote:
Thu Dec 31, 2020 10:26 am
One final caveat, null testing only reveals that two stems are different, not which is which.
In the case of a transformer input microphone preamp vs transformerless pre the one that has artifacts might be preferable in use.
by Gold
Wed Dec 30, 2020 5:18 pm
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

mediatechnology wrote:
Wed Dec 30, 2020 4:17 pm
Null test with music.
Good Idea!
by Gold
Wed Dec 30, 2020 3:39 pm
Forum: Pro Audio Design
Topic: Cohen/Transamp output stage
Replies: 30
Views: 55505

Re: Cohen/Transamp output stage

If you want to have some fun, do some null testing between your favorite preamps and each other or perhaps even the reference input with preamp wiring inverting. A null test won’t tell you anything about the dynamic behavior of the transformer. Without quantifying the dynamic behavior you get an in...
by Gold
Mon Nov 02, 2020 11:29 am
Forum: Pro Audio Design
Topic: API 24 channel summing mixer (pics!)
Replies: 5
Views: 19472

Re: API 24channel summing mixer (pics!)

Looks great Magnus.
by Gold
Thu Oct 29, 2020 2:43 pm
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 350332

Re: Mid Side M-S Matrix Construction Information

You can do all three items. Let us know how the MS Barry Porter EQ works out. Thanks Wayne. Will do. I had the M/S board working in the two channel version I built but I was using all the sections. I thought it would be better to eliminate as much as possible. The sound before was good but maybe th...
by Gold
Thu Oct 29, 2020 1:40 pm
Forum: Build
Topic: Mid Side M-S Matrix Construction Information
Replies: 121
Views: 350332

Re: Mid Side M-S Matrix Construction Information

I am using the first generation M/S board as a Line Receiver and Line Driver as well as M/S matrix for my Barry Porter EQ build. It will be M/S only. The BP has a balanced line receiver feeding a unity gain non inverting opamp buffer feeding the summing amp in a SVF topology. The input impedance of ...