Battery powered DAC

I compared the Nixon with the similar Ack! and immediately chose the Ack!. I have since compared it favorably to the EAD DSP 7000 III and with a very nice and smooth recent Van Alstine. The Ack! runs on batteries, always a major improvement, with the added advantage of no powercord to imrove upon. I've upgraded my Ack! significantly by replacing the 3.3 mF AuraCaps with Dynamicaps, a pair of 5 mF and a .01 bypass per channel. It really opened up and the bass improved big time. I use it with an EAD T1000 with a Mapleshade/Insound Zepher dig link. Extremely open yet smooth, dead silent with wonderfull dynamics; the best I've heard.

Thanks for your contribution Piedpiper. May I ask what are the sonic differences you heard between the Ack and the Nixon? Which Nixon did you audition? And, briefly, what's your system like?

Sold my MF A324 and kept the Ack!Dac. You can search AA and read my review. It's great.

Dear Viggen, I was outa town.

I can't remember which Nixon. It was tubed and in a black plastic case. Incidently, Pierre Sprey of Mapleshade would insist that it would sound much better in a maple wood box. He's very strong about the negative qualities of plastic as a dialectric. I just was discussing the ack and the cap mod with him and he suggested that the extra 5 microfarad on each channel was most likely unnecessary, stating that the DynamiCap and particularly the bypass might have been the real poiint here. I don't remeber whether I added the second 5 or the bypass first. I'll revisit it.

I did the Nixon/ack comparison with stock units of both. The Nixon was softer, grundgier, not as clear, not as silent a background. I didn't take alot of time with it because it was pretty clear to me which I prefered. It's not suprising to me given the battery and simpler circuit of the ack.

My system consists of the above mentioned transport and dac into a modified Cary SEI LX20 giving 20 watts single ended into modified Gallo references using all Mapleshade/Insound cables and power cords; pretty tweeked and well set up, halfway into the long length of the room with the listening position fairly nearfield at the apex of a right triangle in a 13x24x9 room with roomtunes.

Another thought, gleaned from musings on the Sutherland PhD: it seems there would be great sonic and logistical advantages to having a cheap AC/DC supply that could be simply switched in for convenience listening and to keep the circuit warmed up. The sonic advantages of batteries are huge and way cheaper to boot than a properly designed AC PS. It's a no contest if you ask me. Until you've heard a battery supply you won't get it, perhaps.