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From the TI OPA161x datasheet: Input capacitance is negligible if nothing has been added to the input circuit. However, there is usually a parallel capacitor added to ensure stability and/or block RF. Is that present? If so, what's that cap's value? Is there a ferrite bead on the input...

Still no input capacitance specified. The preamp's Cinput is pretty much a non-issue for MC cartridges, but it can be important for MM cartridges. It's probably best to keep the Cinput as low as possible, since there will be significant capacitance introduced by the tonearm wiring and...

Did you post the input capacitance and impedance for MM and MC inputs? I'm sorry if I missed them.

The discussion is about the relevance of SINAD as *the* figure of merit for an RIAA phono stage.

Good point!

No sane person claims better specs for vinyl playback compared to digital. Vinyl playback is electro-mechanical, therefore it includes much larger errors than digital encoding/playback. But, being an electro-mechanical playback system, it is subject to resonances all through the playback setup...

It's a simple 'how to'. Not really documentation. You know, I think it's funny that we have a phono stage being judged on its superior SINAD, which you're extremely unlikely to get to hear because the surface noise from any record is going to absolutely bury the noise from the preamp. This...

Is that documented anywhere? Even after repeated requests, I don't see a reply from Fosi about this, and the Fosi site only has this for specs: Specifications Input Mode: MM+MC RCA Output Mode: RCA THD: ≤0.009% SNR: ≥ 92dB Device Dimension: 4.1 x 6.5 x 1.4 inches Power Supply: 16V/1A No...

That should be a nice improvement. Will it make an audible difference? :D

Ah, I see. Technically speaking, a USB output is digital too. That confused me. I see the E2x2 OTG adds a second USB-C port (labeled "OTG") and an optical S/PDIF Out. - The function of the S/PDIF Out port is clear enough, if limited to stereo. No ADAT? I guess not. - Is the OTG port only...

There are two USB-C ports on the back panel. One is labeled "Power", the other simply "USB-C". What is that USB-C port there for? Input only? Normally I'd expect the digital audio captured by the interface to be sent out through its USB-C port to a computer for recording directly to hard drive...

I missed that post. 25k ohms is nice. Relatively easy to drive, even by vintage tube preamps like the Dyna PAS. No worries at all with any modern sources.

It's a glaring oversight that the input impedance is not specified in the manual or in Fosi's FAQ on their website. The one clue we might have is that in the photo of the amp with its case open the volume control pot is 50k ohms (labeled "A50K", ganged, presumably audio taper). Usually the...

EDIT TO ADD: I just got a Fosi V3 stereo amp with 48V psu. It sounds pretty good! I don't know if it's 'shiny new toy' bias or not, but subjectively, it sounds quite good driving my old Snell Type E/III speakers (6 ohms nominal, has a 4 ohm woofer). I've yet to try it with my JBL Studio 530...

Oh my goodness. If you do a web search you will find literally hundreds of threads about this. Here are a few links I got. https://www.audiosciencereview.com/forum/index.php?threads/replace-op-amps-completely-pointless-or-not.27058/...

I can't seem to find this DAC for $48. Amazon says $79.99. For $80 this is an 'also ran', in my opinion.

This makes me cry, just about every time... The Divine Sarah Vaughan...

Swingin' in the tradition, a great guitarist (and composer too!) from New York City, Pete Bernstein. This is "Chant" written by Duke Pearson.

This is more contemporary. A great guitarist and composer from Philadelphia, USA, Kurt Rosenwinkel.

Thanks for the snippets. What's in those quotes reinforces what I've already posted, but they do not support your claim that "Douglas Self in his books on power amplifier distortion defines class B as optimally biased class AB. Not underbiased and not overbiased, just biased to get lowest...