Any opinions on the AMR Digital Processor 777 Dac?

Hi JazzOnTheHudson, some comparisons have been to Murray James, FIM Gold, Argento (CRAZY EXPESNIVE!!!!) and I always go back to my design. Not sure exactly what you are referring to by "Magnetic Cables". DIY cables can be as good and better than aftermarket if you know what you are doing and start out with superior materials. Do not fall for the Continuous Cast marketing non-sense. I am not going to get into that except to say do some googling and find out what and why that inferior form or wire manufacturing was created. Leave it to the cabling liars (oops sorry marketers) to completely obfuscate the truth.

Loftarasa; I will state that my experience with the iTube is completely to opposite of yours. I find the 3D Holograhic indispensable and absolutley transpatent in zero gain mode. Again, it bettered both my MFA Reference and Baby Reference and Equaled "No Preamp" (i.e. using PureMusics 64 bit volume control in conjunction with a wide dynamix range 24/176.4khz recording and -6dB on PM) as far as transparency. I can't speak for your system but the iTube is ABSOLUTELY transparent over here. Listening to Enya via my SP10-MK3/AMR PH77/AMR dP777 and iTube and i defy anyone to hear a loss of detail when the iTube is installed (if it were out of my system which it never is :).

I have never needed to use the digital antidote with the AMR.

One thing to note, the wall wart IS orientation sensitve, the cord leading from the wall wart should be aligned with the ground plug receptacle on your wall socket. This is easily heard if it is in the wrong configuration.

I have found this to be the case with all of my amplifiers Reimyo PAT777, Graaf Modena, both Graaf GM 200's, Acoustic Reality Thaumaturges and the EAR 1001 REFS and my own 230 watt monos.

The MFA Reference units are some of the finest volume attenuators out there, the Concert Fidelity Pre is world class and I still went with the iTube. I know nothing of NADs gear having never purchased it, perhaps it is simply not sympatico.

YMMV

@audiofun, your gear is higher-end than mine and I don't doubt your claims about the iTube's performance in your system.

But I'm sending my iTube back as it's not adding enough value for me. Having to go from variable balanced to fixed output single-ended may be a factor in my evaluation (different output stages, different cabling, voltage levels, SNR, CMMR things), though.

Fiddling with the wallwart connector thing sounds bizarre; not quite what you're onto there.

My last comment is I know iFi are coming out with the iTube mini, where we should expect higher performance (for higher outlay). That in itself may also suggest the iTube's most obvious use-case is computer/desktop/second-systems. I'd be interested in that if it supports balanced inputs/outputs and/or I switched to a fixed output DAC.

Cheers.

Loftarasa; I totally understand that all things don't work in all systems and you are correct, the iTube Mini is on the way and as I understand it, that you unit will sport S.E. and TRUE Balanced inputs and outputs along with multiple inputs. The Mini will also sport a better analog volume control and a better power supply, although the P.S. included with the current iTube is already quieter than a battery supply.

I have always contended that the iTube used with its own volume control and/or in +6dB gain is absolutely NOT transparent :)

Question for you... If you went to "fixed" S.E. were you using the iTube as a preamplifier? If you were (using the iTube as a volume control) then I TOTALLY understand your comments/findings and agree with them. That is a great feature to have in a lower end system (not being a snob) or as a backup in the case that your preamp is in the shop for repairs or the such.

Back to the music., listening to Reference Recordings Rachmaninoff on 200gram vinyl as I type this :)

Hi Audiofun, I played around it with again last night. I agree with you; in Preamp mode (both 0 or 6db gain), it's deleterious. The loss is much less detectable when in buffer mode, but here I preferred 0db to 6db. I also agree the Digital Antidote feature is not really my cup of tea and that the 3D feature is pretty neat. So I think we're on the same page, except for me, going from balanced to single-ended is too much of a net loss. I may wait for the iTube mini.

I'm no E.E. but I still don't quite get why switching the orientation of the wallwart will make any difference -- I mean, it's converting AC so electrically, how can it matter?

The polarity issue would take way more time to get into and explain than I have :) Let your ears be the judge, try it oriented in both positions and ponder what you hear :)

Just so you know I am not one of those people as it relates to high end who believes everything can be explained. FYI, I have no idea why some power cords sound better into my SP10MK3's power supply than others ??? well, ok.., I have some ideas ...