hi everybody.
i purchased a r2r 7 he to replace my he7 i am currently selling.
I have updated it to the v2 firmware smooth/accurate, thanks to the informations shared on this post
I am now trying to identify the best jumper setting.
Currently I only have bypass jumper on, which I think, sets the NOS mode 3 8x oversampling. Is that correct?
What are your experiments and best settings?
Do we have some recap table or something somewhere in the post?
Thanks!
Hi, this should be posted on the R2R7 & R8 post. - I am trying to see if I can repost this there
Over the past week my R2R7 has really burned in or getting more stable (now at 1000 hr or beyond playing non-stop in past month). I have been listening to NOS modes except the beginning with OS8 with the default setting.
NOS2 has been working really nicely in the last few days, no signs of fatigue, liquid smooth and at times organic quality with not much digital glare when fully warm up, from a great recording.
PCM sound is now getting very close to DSD sound, though some stage/sense of realism is somewhat less impressive on digital files compared with CD transport (which remains amazing) but the details may at times be better than CD transport (to be expected given I am comparing 24/96 versus 16/44)
Here are the few differences between the 3 different NOS modes I have observed:
NOS 1: very wide sound stage, uncanny detail, really analogue/smooth and musical, and almost Vinyl-like, definitely having DSD-like quality, detailed layering; This would have been the best mode if not for some side effects of rather unforgiving sharp edginess or certain recordings, will tend to brighten the sound a bit too much at times, esp on poorly recorded bright recordings. Tutti passages in large ensemble/orchestral recordings can sound a bit chaotic or disorganized, like all instruments are sounding with same loudness. So despite great and even amazing spatial imaging and separation of instrument, they are not necessarily that well organized on certain recordings, may sound a bit raw and uncontrolled. Also my CD transport cannot input to R2R7 with NOS 1, as it causes electrostatic distortions. No issue with NOS 2 or 3.
NOS 3: A most refine mode, music neatly played, most forgiving mode, no harshness at all even with more nasty recording. Probably has the most forward sound stage of the NOS modes. But may feel a bit too much cover up or warmth of the tones, like you put on some warm tubes in the gear. A bit too juicy ? Probably the mode to go to if you have some real nasty recordings that need some more conditioning (or your playback source is sub-optimal).
NOS2: Seems to have the best of both NOS 1 and NOS 3, currently my favorite. There is no harshness/digitalis, just like the NOS 3, but also the transparency and detail, smooth analogue feel of the NOS 1 and also reasonably wide sound stage, not sure if wider than NOS3 but not as forward, probably more focused than NOS 1 and layering/instrumental placement is excellent, does not have the rawness of NOS 1 and has some of the refinement of NOS 3, even if perhaps not as refined as NOS 3.
NOS 2 using CD transport is amazing. The more relaxed sound stage helps with reducing the hardness of the poorer more "digital" recordings; Wide natural sound stage that can approach DSD. You can tell the difference between analogue remastered recordings (very analogue and smooth, no grain, with SD DAC they often sound rough and edgy), the great recordings in the 2000s, ( ? using digital tapes) and the more dynamic and brighter recent 24 bit recordings which can sound more digital/unrealistic. Dynamic range is amazing, and can tell a gain in larger dynamics with 24 bit late recordings compared to earlier ones. I don't recall SD DACs having such distinction
Note I did not test NOS 0 (with digital filter, with bypass off, IPS0 and IPS1 on. )
All NOS modes are tested with PLL off. I did use NOS1 + PLL on and that solves the issue of upper freq edigness/distortion,but sound stage is narrower, it sounds more lilke NOS3, but since it cannot tolerate my CD transport I stopped listening to NOS 1 very soon.
FW: latest smooth - V2S
Macbook Air --> Audirvana --> idefender + ipower ---> DH lab Mirage USB ----> iGalvanic --->isilencer ---> Regen USB adapter ---> F1 internal USB board ---> R2R 7
Sony Esoteric CD Player SA-60 ---> DH lab Toslink --->. R2R 7
Testing done with open baffle speakers only (all tube amps, pure silver interconnects and speaker wires); not really listening to Headphone enough
The CD source has the simplest chain and has best/amazing result
I may return to NOS 3 again to reevaluate to see if it can become the best mode still, but for now very satisfied with NOS 2 !
. Hope this helps those newcomers!