Search found 700 matches

by Gold
Fri Sep 09, 2011 12:09 pm
Forum: Pro Audio Design
Topic: Balanced Inputs
Replies: 89
Views: 155060

Re: Evolution and Origin of the SuperBal Variable Gain Input

Good stuff!
by Gold
Wed Sep 07, 2011 4:13 pm
Forum: Pro Audio Design
Topic: Balanced Inputs
Replies: 89
Views: 155060

Re: Evolution and Origin of the SuperBal Variable Gain Input

I'm pretty confused by the Super Bal arrangement. What does taking the positive polarity signal from the voltage divider in the input opamp feedback and summing? it with the inverting amp signal accomplish?
by Gold
Tue Aug 30, 2011 4:38 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 454837

Re: Flat Phono Preamp Based on John's P10 and 2SK389

MM cartridges have high inductance and rising impedance vs. frequency. The noise current contribution is more significant than it would be in a mic preamp where the noise voltage is typically low but the noise current high. Those are some good hints. I will study the data sheet a little before aski...
by Gold
Tue Aug 30, 2011 2:47 pm
Forum: Pro Audio Design
Topic: Flat Phono Preamp Based on John's P10 and 2SK389
Replies: 248
Views: 454837

Re: Flat Phono Preamp Based on John's P10 and 2SK389

The stars must be aligned. I want to use this design because you can run the front end floating. I like that idea for cutting studios because ground loops and long cable runs are sometimes unavoidable. I would like to have a better understanding of what makes this design optimized for a high source ...
by Gold
Thu Jul 28, 2011 2:35 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619775

Re: Mid Side M-S Matrix Uses No Precision Resistors

Paul - Do you suppose that the popularity vinyl released today (that presumably sounds better due to not being over-processed and slammed to the wall to the degree that CDs are) will somehow cause people in the labels to ask if this CD loudness war shoud be stopped? It's a hope of mine. I don't thi...
by Gold
Wed Jul 27, 2011 6:52 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619775

Re: Mid Side M-S Matrix Uses No Precision Resistors

Thanks Doug. I did a lot of planning so that if I don't like something I'm not locked into it. I'm thinking erector set. I think the overall approach and concept is sound. It's been five years in the works. It can be hard to keep focus because as i learn more I see more options. To my credit I have ...
by Gold
Tue Jul 19, 2011 7:09 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619775

Re: Mid Side M-S Matrix Uses No Precision Resistors

Thanks Wayne. It's a full H pad with a 10k input impedance and a 5k output impedance. I thought it was a good compromise to throw away 6dB and get a lowish source impedance but have a bridging load.

BTW I sent you an email yesterday for some more m/s boards. Did you get it?
by Gold
Tue Jul 19, 2011 2:28 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619775

Re: Mid Side M-S Matrix Uses No Precision Resistors

I finished the prototype input and output amplifiers for the console with the Shallcos. http://www.saltmastering.com/a80/InOutFront.jpg http://www.saltmastering.com/a80/InOpenBack.jpg http://www.saltmastering.com/a80/OutClose1.jpg http://www.saltmastering.com/a80/monitor-2s.jpg That's the M/S board ...
by Gold
Sun Nov 21, 2010 9:20 pm
Forum: Document
Topic: Op amps: to dual or not to dual? (Part 1 of 2)
Replies: 3
Views: 8060

Re: Op amps: to dual or not to dual? (Part 1 of 2)

Very interesting. Thanks.
by Gold
Sat Aug 21, 2010 3:36 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619775

Re: Mid Side M-S Matrix Uses No Precision Resistors

If you want accuracy in the neighborhood of .1dB then I think a pot is only good for about +/- 3dB. I wanted +/- 12db but the largest switch Shallco makes is 46 position so +/- 11dB it is. It goes to 11!