Currently plugged in are the DT880 600 ohm, but I tested with
Focal Listen Pro
HE4XX
V-Moda m100 Master
Koss KPH30i
Beats EP
Grado SR80e
DT880 600 ohm
TIn HIfi T2 pro
Maybe none of them are sensitive enough, but on those, it is hard to hear any significant difference. Certainly not a $200 difference in my opinion, but that’s subjective.
Hmm, I would say the 880 600 ohm might be the more sensitive to differences, but I’m talking like the 1k-700 range where the differences get more apparent imo
I’m going to be on the hunt for some more premium models soon, any recommendations if we own all of the ones listed above.
That tends to be the range that I do notice the most difference. It’s the range that some amps seem to have a better resolution and sparkly that some amps don’t have. If that makes sense.
It’s amazingly obvious when you compare amps like the Magni 3 vs the Heresy, not so much or at all on some others. IMO
I was mainly talking about the range of price of headphones lol. But you are correct in noting that range where human hearing is sensitive
Like it’s been said over and over again, too, you must really be able to pick those differences up in the first place, but saying they all sound the same isn’t true and HEAVILY depends on the headphone used. For instanced Argons simply sound lightyears better with way fuller bass on the SP200 compared to the Atom. Every random test person on the street could tell as much.
True: The power makes a difference. If you ever look at frame rate test on PC they use a high end CPU to remove it as a limiting factor. Volume matching is very slightly the same idea as power doesn’t necessarily scale with volume.
Ex. The Magni 3 has more thump/impact in the bass compared to other $100 amps… this is due to power. But… The results are the same across all the headphones tested on it. Sure power hungry headphones are going to sound better to a degree on a more powerful amp…
At the same volume level with headphones around the same power requirement / ohm load. All things even the amps should really close. Or rather they did In my A/B testing.
To your point though. The 600 ohm DT880 requires the volume to be much higher on something like the Archel vs the SP200 vs the Heresy.
I used a sine wave and meter to volume match the amps…
But again the Heresy VS the SP2000 is a much close match in terms of power… but I get your point. That’s why i mention the headphones I use for testing in the article.
My RNHP arrived! And I’m still stuck at university for a few hours 
Will report back later with pictures and my first impressions 
Curious to see how you feel about it, hopefully it’s good lol
First Impressions before listening to it:
It absolutely screams quality. The volume knob is now the nicest one I’ve ever used, even better than the NFB1’s pot. The unit is a lot heavier, bigger and especially nicer looking in person than I had anticipated. It looks actually really nice in person.
The input selection LED is (as mentioned before) really bright and in dark environments I’ll probably have to tape over it with some electrical tape.
Even the 1/4" jack is so nicely done. It’s just snug in there without any play whatsoever.
Will now give it a quick test listen and report back with my first impressions!
Can’t wait to see what you feel about it 
Alright, after a quick listen to them on my Amiron Homes, Sundaras and TIN T2s:
I went into this test thinking It’d be the THX sound but just … better, which isn’t true at all.
The amp sounds noticeably different from the THX offerings, by a good shot. Compared to the SP200 and the Atom the RNHP sounds a lot more musical and lively, however at the cost of precision in my opinion. It doesn’t sound as clinical as the Atom and the SP200. The RNHP sounds like everything’s getting a lot smoother and laid back. In my opinion it depends on what the expectations are whether or not this can be classified as an upgrade.
For me personally, I love how my music sounds more lively and coherent on my Amiron Homes and Sundaras, however I have problems with my T2s.
Even using an iFi iEMatch my T2s have a noticeable whistle sound, even when the volume is set to 0. Mind you this isn’t noise, it sounds like someone is blasting their whistle a good 500 meters away and I can hear that. Even when the source is switched / unplugged and the pot is set to zero, it’s still audible. Interestingly enough this is a constant whistle sound and won’t worsen the louder I go. It’s so audible however that I can hear it through music and that’s kinda … worrying? I haven’t had this issue on my Atom at all and on the SP200 I only had background noise but not this weird whistling. It’s also not present on my overear headphones, just the T2s.
So my first impression is kind of mixed. It trades absolute precision for smoothness and thus sounds more musical which is really nice for enjoying music, however it absolutely ruins my T2s.
Anyone got an idea? If this isn’t anything fixable I might not keep this unit as I’m getting more and more into IEMs and there’s plenty even more sensitive IEMs than the T2 who’d probably even suffer more.
That’s very strange, my t2 does not do this with my rnhp
Also regarding that amp, it’s not going to sound as apparently detailed as the thx stuff at first, you gotta grow into it and then you see how accurate it actually is
I’ve plugged the shipped power adapter right into the wall socket, no extension cord or power strip. Is there anything I could try? If it’s even audible at zero it should be something with the power?
Yeah you may have noisy power. Perhaps plug it into different outlets if you can and see if that changes
The rnhp has almost no output impedance which works very well with iems from my experience
Tried it now on different sources:
It exhibits the same whistling on all. I was able to record it (mind you it’s pretty quiet, just holding my phone next to my T2s): Google Drive MP3
What do you think of that sound?
That sounds like power supply noise, or a ground loop. Was that with the same outlet?
Different outlets, same issue 
yeah, that’s like a coil whine noise. I hear that from my video card all the time. I’ve never heard it from any amps, though.
