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Posts by jamescodway

It seems the iDevice RF issue coincides with device becoming fully charged by the HD DAC-1. Today there is less/zero issue while the iDevice is still being charged... go figure!In practice this means swapping between CCK+normal USB and the iDevice interface on the front panel.BestJames
I have owned the Audiolab MDAC for 2 years. It is a very competent unit that as a dac/amp suits some headphones (HD650, RS1, SRH940) but is significantly underweight for HD800 and does not suit other phones such as B&O H6 and Beyer DT250-250. It has no iDevice specific interface. The HD DAC-1 carries much more authority as a DAC and especially as an amp. IMHO, there is no real contest given a UK street price difference of probably around 10%. Best James
My listening tests have been brief and not scientific but my belief is my experience of my 1st and 2nd unit mirrors your own, except the hum on the 2nd unit seems a little less at all gain settings. I've now established the residual RF issue is my iphone 4s that cannot be hard reset (lock button busted). Once I have settled on a new source (I hear the front usb/idevice input as more detailed/more treble than the conventional rear usb) then I think I will be very happy with...
Hello again. I have tried several different 30pin to usb cables. This seems to have no impact on RF incidence or severity. Also re: HF, the response my dealer received from Marantz was to factory reset the HD-DAC1 and 'hard' reset any iDevice to be connected (e.g. hold both iphone buttons until apple logo appears). This seems to have had some benefit. I also now have the dealer's demo unit which hums a little less and initially sounds at least as good if not better than...
I perceived deterioration when the attenuation value exceeded -40db. This was during a trial for the audio lab power amp designed to be used in this way. The dealer was not able to confirm the manufacturers position when I returned the power amp. Best James
Hello all.   For general reference, I took home a HD DAC 1 on trial on Wednesday. It ran hot, hummed a little and suffered serious RF interference on the front IOS USB input. I read elsewhere online of experiences of some faulty units.   On return to my brilliant local supplier today they found their demo unit also demonstrated RF interference (albeit a lot less) with a lower ohm headphone (B&O H6) and so they are going to contact Marantz to obtain a (silver) unit that...
 I find my HD650s direct from the M-DAC headphone out (source: Mac Mini/Audirvana) deliver excellent detail and positioning. Timbral accuracy?...  the jury is still out on that one. Look forward to reading your impressions. Best James
 I find the MDAC headlamp a puzzling thing indeed... synergy with different cans is unpredictable. My favourite listening combination right now is MDAC to HD650 (source MacMini/Audirvana/MP3 320/decent USB cable). They also work well with RS-1s but DT48 and HD800... no no no! With the right can and a decent source, I think the MDAC can be a brilliant all in one solution. Best James  
  You've got me wanting to buy a headphone I gladly gave away 3 years ago... lol!   I don't love my 840s...   Best   James
Interesting! My bad, I meant upper bass dip. I remember being wowed when I auditioned them as the signature gives vocals a high profile. This prompted the purchase. Over time the appeal waned. I confess I have not heard them in over 2 years... Given the 250-250s as a reference (amp differences notwithstanding) I'd be interested in your view a few weeks on. Perhaps my memory is prejudiced... I would be rather surprised if Senn had changed the product given it has been on...
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