Search found 604 matches

by Gold
Fri Nov 01, 2019 9:48 am
Forum: Test, Measurement and Repair
Topic: APx500 Flex Audio Analyzer
Replies: 7
Views: 233

Re: APx500 Flex Audio Analyzer

I’ve been trying to picture the customer for that. The main reason to buy a dedicated test setup IMO is for the front end. Made for measurement. Hard to blow up. The only thing I could come up with was a large broadcast facility that uses AP in engineering and wants the software in the production ro...
by Gold
Thu Oct 31, 2019 11:29 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 1051
Views: 383014

Re: Entropy

It’s been over two years since we got the garden shed we are using as the kitchen. When we just had one cabin the setup was tight and efficient. When we moved the cooking setup and table to the new cabin we left everything in a state of disarray. We wanted to take our time. We had just spent two yea...
by Gold
Thu Oct 31, 2019 11:17 am
Forum: Test, Measurement and Repair
Topic: APx500 Flex Audio Analyzer
Replies: 7
Views: 233

Re: APx500 Flex Audio Analyzer

I’m trying to picture who the customer is for this. The entry level AP with hardware is around 7K IIRC. Let’s say this saves $2.5K from the 7K. Across a multiple unit QC line it might makes sense. For an individual or small outfit I couldn’t see picking this over a used AP or a new Dscope. I bought ...
by Gold
Thu Oct 31, 2019 10:40 am
Forum: Test, Measurement and Repair
Topic: APx500 Flex Audio Analyzer
Replies: 7
Views: 233

Re: APx500 Flex Audio Analyzer

That doesn’t seem like a very good deal. The Dscope that was introduced last year is 4K for a complete setup. By the time you get an interface you are probably around that price.
by Gold
Wed Oct 16, 2019 1:48 pm
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

Complete unit. I've started mounting all PCB's on rails attached to the sides of the chassis. This allows access from the top and bottom. http://www.saltmastering.com/Console/OutputAmpA_TKD-1.JPG http://www.saltmastering.com/Console/OutputAmpA_TKD-2.JPG http://www.saltmastering.com/Console/OutputAmp...
by Gold
Sat Oct 12, 2019 11:27 am
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

I kept banging away at this. I had each channels signal and common wires tied together at a few points with lacing twine. I didn’t have the channel bundles tied together. I separated the wires and saw a 1dB improvement in the cut. Yesterday I was seeing -79dBu on left channel and -76dBu on the right...
by Gold
Fri Oct 11, 2019 1:58 pm
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

Damn, foiled again.The attenuators need the 5K termination for accurate gain steps.
by Gold
Fri Oct 11, 2019 1:54 pm
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

I spent some time trying to improve this. I noticed there was 20KΩ to ground at the Unbalanced Output feeding the Fader-Attenuator. I sub'ed in a couple of values and saw a pattern. Then I put a rheostat in place of the resistor and adjusted for the deepest cut. Curiously the value was 2k5Ω. Half th...
by Gold
Thu Oct 10, 2019 11:53 am
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

I'm seeing something I don't understand. When feeding a 1K 0dBu tone in, with 11db of gain (zero attenuation with the attenuators) and the fader fully CCW I get a kill below the measurement range of the Portable One. With the fader still all the way down I get a kill of -86dBu with the attenuators a...
by Gold
Wed Oct 09, 2019 8:20 pm
Forum: Pro Audio Design
Topic: T Attenuator Termination Kluge
Replies: 42
Views: 6900

Re: T Attenuator Termination Kluge

Thanks. I’m happy with it. Crosstalk -90dBu at 20K. The input is AC coupled. After that everything is DC coupled. Now I have to put the new pot in the other Output Amp.