Indeed. The photo doesn't really do them justice.

No, they're HiFi2000 Pesante Dissipante with custom milling/drilling on the front, back, and heatsinks.

Cases in today.

I have, in fact, done some listening. Eighteen of the boards are under construction; not pictured are the two boards that are completed and hooked up to temporary heatsinks, a σ22, and my source. It is, to put it mildly, pretty damn good. For the uninitiated: the above is a whole batch of...

One at a time, ladies.

Progress:

I would suggest contacting them directly.

Quote: Originally Posted by MrSlim It is the most sophisticated DIY amp in existence, Not anymore

What? No :P HD650.

Quote: Originally Posted by stew1234 I know in the first post you said it is powered by a wal wart. Would there be any improvement in SQ by using a different psu like the sigma 11? No. The wall wart only provides AC; the onboard Jung regulator is likely superior to the σ11.

Sweet, someone who knows what they're doing more than me :P Quote: Originally Posted by jcx I hope the R37,38 are open - the Vcom inputs of the diff op amps try to split the supply V and connecting to one rail would a bad idea further the data sheet highly recommends bypass C on...

Yeah, once I'm confident enough in the state of the design (read: have properly benchmarked the regulator, and have had other people take a listen and say that it sounds good), I think I'll do a group buy. I also have a metric assload of the smaller surface-mount components (I got a lot of...

I don't have an M3, sadly... I think I'll ship a prototype out to some folks in California with lots of things to compare with and have them do a shootout.

Quote: Originally Posted by smeggy heh, and all for a projected price of under $300 That's what you said right? hehe Ahahahahahahahahahahahahahahahaha :P

Quote: Originally Posted by bada bing This looks like a very good design to integrate the differential outputs of a WM8741 DAC chip on. It seems like you could eliminate a bunch of buffering and cabling monkey motion pretty easily. I don't want to say too much too early, but... I...

Quote: Originally Posted by Koyaan I. Sqatsi Yes, there's only a single voltage regulator because there is only a single supply, the bottom of which is "ground" and variously labeled "-UB" and "V-" in your schematic. That is not correct. -UB and V- are not the same node. Look at...

Quote: Originally Posted by 00940 is this better ? Much The other thing to remember is that unless your amp is wired with a perfect star-grounding scheme, ground is not a "node" in the EE sense - it's a whole bunch of nodes all connected together by various low, but nonzero...

Quote: Originally Posted by Koyaan I. Sqatsi It's NOT a personal issue. It's not about who's right or who's wrong. It's about what's going on and what's not going on. <snip> <snip> And this illustrates that a ground channel does not divert load current from ground as has been...

Quote: Originally Posted by 00940 Very nice idea and an apparently perfect implementation. More economical than building bridged amplifiers. The opa1632/ths4131 opamps are neat little things, with a decent quiescent current. How hot do they run in your build ? Toasty. It's a bit...

Quote: Originally Posted by Koyaan I. Sqatsi The load current still flows through ground. As I've said before, it doesn't just hit the power rails and then magically disappear. What is "ground"? Most amplifiers have a pair of power supplies, whether they be tracking or...

Quote: Originally Posted by TzeYang It's basically m3 with a fully differential input and output, so sound wise they should be pretty similar. I'm more curious on the PCB layout since there are so many stages on the PCB. How did you do your grounding? Star ground or ground plane...

Ask and ye shall receive.

I've been working on my own amplifier design for a while now, and have finally come up with something that seems to be working well. My design goals were straightforward enough: - Make it fully balanced. 2 channels will work well with good enough grounding, 3 channels improves things, 4...

Snazzy! There's no way I can pick up another build project now, but I think someone should build one of these with a Switchcraft TY4F four-pin mini-XLR connector. Much more elegant than two 1/4" jacks. :P

Quote: Originally Posted by linuxworks arduino for the win! lol. No Arduino, just a solitary ATtiny24.