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I don't like to buy items that must be returned to a different country. A dac I sent back for repair was $85 shipping to China from the USA. So, can these be 3e-audio amplifiers be bought anywhere in the USA besides Aliexpress and Audiophonics? Also, the "sell more opamps" comments, are...

I've been puzzling over where the advantages of open baffles end in frequency, that is, where should one transition from open to box. I'm using a homemade simi-isobaric sub (in a box, with a port on the interior chamber, hence a "semi-isobaric") with two 10 inch driver for each sub fthat goes...

I fixed that, thanks. Truthfully at 68 ears old, I might be at -90 in my ability to hear distortion in amplifiers. I'm not sure that's age related. I've never actually tried to anything systematic to figure that out. I've just noticed things like the Mini-Dip HD, when added to my system...

I just finished this thread, reading it off and on over time. The times it was dragged off topic made me lol several times, especially about the patent issues, but I still enjoyed it. Now I see the off topics posts as "bird walking", off (and back on) topic a number of times. I'm still...

I need an amp for a 6 way speaker I've built, and these might good be for the tweeter, the Corundum that is 92 db efficient. I am using a mini-dsp hd to crossover at 3100, with a 48 slope. Why do you think these would be a good tweeter amp? My thoughts are the low distortion, and SINAD., and...

Around 115, if I remember correctly. Does that change as we get older, has anybody seen studies on that?

Unfiltered class D does not sound good, as engineer Bruno Putzney points out in this article on the evolution of class D sound: https://hometheaterhifi.com/30th-anniversary/life-on-the-edge-a-personal-perspective-on-the-past-present-and-future-of-class-d-audio-amplifiers/

A couple Double Blind testing stories for your amusement.. Op Amp testing that showed differences? I bought a half dozen op amps, got some more from an engineering friend, set up testing that took most of the day. We used a battery powered Elliot Sound Products pre amp board, and a battery...

I have DIY Open baffle speakers. They are 5 way, using the 4 way Linkwitz's as a basis (mine are a 12, 8, 6, and a 1, plus a sub on each side) for comparison. Moving the speakers out into the room about 3 feet is sufficient to produce a very good soundstage. I put my speakers on furniture...

I built a kit Transcendent Sound Grounded Grid Preamp, about 25 years ago, and since it was inexpensive, I decided to splurge on caps and tubes. I got some Bugle Boy (not that expensive at the time, but considered some of the best, now and then) 12au7's. I was surprised that they didn't make...