Search found 5449 matches

by mediatechnology
Fri Jan 05, 2024 11:02 am
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

Regarding vinyl capture. I still can get in my mind around why would anyone need an a/d with such a low noise, the SNR of a vinyl record is what, like 60 dB? this thing has 129 dB of SNR. What is the logic behind it? In my situation I'd use it just because I had it. Most of my clients who are using...
by mediatechnology
Fri Jan 05, 2024 7:05 am
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

I haven't found a good work-around in AudioTester for ASIO devices that are not full duplex. The TI PCM4222 EVM shows up as the Emu0404 when its SPDIF output is internally routed to the 0404's output. I can use the 0404's D/A and the 4222 A/D simultaneously using the 0404's console. The D/A locks to...
by mediatechnology
Thu Jan 04, 2024 2:18 pm
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

The iFi doesn't offer full galvanic isolation. It's expensive because it has a high mark-up. The added series R in the ground, which sometimes has back-to-back diode clamps in some people's builds, is usually enough to quieten them. Here's a link to E1DA's store: https://www.aliexpress.com/store/110...
by mediatechnology
Thu Jan 04, 2024 1:26 pm
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

For me the Cosmac's fixed input gain and lower input noise would allow it to replace the PCM4222 EVM I use for critical measurements. The 2i2 Gen 3 however is my daily driver for test and measurement. I also have a second one on a desktop PC. Both have an iFi USB ground isolator with external power...
by mediatechnology
Thu Jan 04, 2024 1:10 pm
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

For me the Cosmac's fixed input gain and lower input noise would allow it to replace the PCM4222 EVM I use for critical measurements. The 2i2 Gen 3 however is my daily driver for test and measurement. I also have a second one on a desktop PC. Both have an iFi USB ground isolator with external power ...
by mediatechnology
Wed Jan 03, 2024 6:40 pm
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

I did a quick comparison of the 2i2 Gen 3/Gen 4 here: https://www.proaudiodesignforum.com/forum/php/viewtopic.php?p=17346#p17346 For me the extra 11 dB DR on the A/D makes it worth it. They also lowered the output impedance from 300Ω/leg to 100Ω leg. I think they were able to lower the output impeda...
by mediatechnology
Wed Jan 03, 2024 11:47 am
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

Seems like a good cart, the very significant increase in THD is interesting. Also, the performance of that Scarlett is stellar. Which generation are you using? Considering that it was bundled with the turntable which sold for $179 it seemed like a bargain. THD? The second set of FFTs were done with...
by mediatechnology
Tue Jan 02, 2024 9:57 am
Forum: The Peabody Lounge
Topic: Too many bots?
Replies: 5
Views: 3493

Re: Too many bots?

I haven't tested it in awhile.
I was blocking a lot of Chinese IPs.
Mostly posts relating to Covid.
by mediatechnology
Tue Jan 02, 2024 9:54 am
Forum: Pro Audio Design
Topic: A "Dummy" Cart For Phono Preamp Noise Testing
Replies: 33
Views: 16757

Re: A "Dummy" Cart For Phono Preamp Noise Testing

I decided to zero in a little closer using the PCM4222 A/D. The absolute dBu figures aren't totally accurate due to the very low input impedance of the PCM 4222 EVM board I'm using loading the 100Ω output impedance of the preamp. The relative levels between channels are accurate. The first FFT compa...