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RE: N core

Posted by josh358 on January 21, 2018 at 10:48:16:
You'll have to forgive me, as an old engineer, from being interested in the technical aspects. :-)

The Parasound is IIRC 10 watts of Class A. Which really covers most listening. A well-regarded John Curl design that many consider the beginning of high end amplification and a very popular amp because its economical. I know that I could happily listen to it forever, but it falls short of the very best and more expensive and often less practical (higher power Class A). I think if I could experiment with any amp now it would be a John Curl Class A design but I'm triamping so limited in what I can spend and how much heat and power usage I can tolerate! (Not to mention that my back isn't what it used to be . . . )

I've always been curious about the NAD amps. Would be fun to try. My problem is that there's no dealer here, so I usually hear things only at shows where everything sounds subpar or I have to buy them used or new and try them here, a slow and frustrating process. I bought the A-21 used and the AHB2 new. Most of the used amps I'm interested in checking out now seem to be in short supply, I've been watching the listings.

Apologies for the lack of a profile! My system has been in flux as I rebuilt it after a period with nothing and then a temporary system while we were renovating the house. I really should get around to it.

But basically, it consists of a pair of Tympani IVA's that I bought used and have been fixing up (delamination now repaired, I still have to do some work on the connector panels). I also have 16 Neo-8 planar drivers that I'm going to use to replace the Magnepan midrange, Satie here came up with that mod and by all accounts it's a dramatic upgrade to the old Maggies.

So anyway my plan is to tri-amp but I have to at least bi amp because as you can see in the photo my small listening room and the projection screen require me to move the two mid-tweeter panels in front of the four bass panels, so I have to delay them so everything will be in time:

To do the delay, I got a MiniDSP OpenDRC DA-8, which has SPDIF in and eight channels out. That will also let me experiment with FIR filters and phase and frequency compensation and room EQ. But I'm not sure I'm happy with the sound of the MiniDSP, I have to do more comparisons but in the brief ones I did it didn't equal my other converters.

For my source, I built an HTPC that's both silent and powerful -- fanless power supply and graphics card, SSD's, sound damping case, humongous and therefore quiet fan on the processor:

:-) I've been delighted with the results, you can't even tell it's on from more than a foot away and yet it uses a fast processor that will do any processing I want (I have a projector and my room does double duty for home theater so I couldn't go with a minimal configuration). Running JRiver for audio and video and Tidal's app for streaming. I have a Dragonfly Red that I've been using to experiment with MQA since I don't have a real MQA DAC.

Anyway, I needed a solid source of SPDIF for the MiniDSP and everything I read put the Lynx E22 at the top of the heap so I got one on Ebay. Since then, though, I've been experimenting with the analog outputs of the Lynx and they sound better than the Mini DSP. So if the MiniDSP doesn't prove out sonically, I think I'll have to get a multichannel converter. I was thinking either of the ExaSound e28, which has been replaced by the e38, or a pro rack like the Lynx Aurora 8 (which has also been replaced), but as usual have no way to compare.

In the meantime, I've been using the converter on the Lynx card for analog out to the power amp, and I'm finding that as its reputation suggests it's a very capable converter, if not quite the equal of what's available today.

Also have to do some work on acoustics, I have a couple of GIK QRD diffusers but need some absorption and deal with a cavity resonance (which will probably mean building a cabinet in the cavity).

So as you can see, a work in progress! But really sounding quite excellent even as is, with the Lynx feeding the A-21 and driving the Tympanis full range.

So basically I need a couple of small sweet amps for the mid-tweeter panels (the Neo 8's are more efficient than the woofer panels and of course the tweeter doesn't require a huge amount of power) and I can leave the larger A-21 doing bass duty.