gcompari
you asked me to check the crosstalk at 32ohm(originally it was measured at 16ohm) I did that. Sorry, I have no time to investigate all your frequency responses, you can try to ask that in our discord channel. 88 and 176k are not supported, that's stupid and that's why G3 got Comtrue USB audio bridge.
So if I get G3 I get also:
- 88.2, 176.4 (352.8?)
- drivers for Win 7, 8.x and 10
is it correct?
Sorry to disturb you with my questions, but (7) about HP1 and HP2 was a "rhetorical question": IMHO the HP2 is far better than HP1.
These plots are from Inner Fidelity website: it's the only source I found for reliable measures about headphones (I hope that
@amirm may find a system to test HPs as soon as possible. I hope also that
@amirm will include crosstalk on low impedance load in its standard test, something about "stability", like full range 10kHz square wave on a inductive load, for example 32ohms in parallel with 0.5uF and a slew rate measure).
HP1 is an HiFiman H400e, this is the HP I found most similar to the HP I saw in your video about #9038D: please note I am not an expert of planar HPs. I have red only plots from Inner Fidelity website. However also Audeze and other planar HPs give similar results.
HP2 is the Sennheiser CX 1.00 IEM.
I think we are speaking about a 400$ planar HP vs. 20$ IEM. You don't consider all of us that are using IEM because your DAC+HeadAmp is only for planar and high impedance HP, but we are all searching for a good product for our IEM or unbalanced low impedance HPs and your product may be the solution, because its very low output impedance, very good performances and high portability. The very high "output level"/"gain excess" and the balance limitation are big issues for most users.
After I saw the Inner Fidelity test of Sennheiser CX 1.00 and CX 2.00 (and tried them), I put in a box my Sennheiser HD-600 that is now covered by dust. I don't like to use something "IN" my hears, but the difference of performances is so much that after listening these IEM, I can't go back to HD-600.
I think you have to reconsider the
@raanany suggestions about a gain control of 9038S/D: you may sell 100x or more products if you add the analog gain control: perhaps in substitution of "modes" that we leave to "normal" in the 99% o cases. Having a very high gain/output level w/o an analog (ev. digitally controlled) volume is only losing bits (i.e. rising quantization errors) for each sample, whereas with a higher negative feedback loop gain you can even rise the specs/performances of the #9038x.
Please note that yours "portable" DAC+HeadAmp solutions, is very significant if used in a true "portable" solution. Planar HPs and high impedance HP (like Sennheiser HD-6xx, HD-7xx and HD-8xx) aren't very useful "portable" solutions.
I hope you may insert some of our requests in the #9038D that we are all waiting: I had to convert (i.e. destroy) a couple of CX 1.00 to "balanced" to test my #9038S and it wasn't very simple... The 90% of existent HPs are unbalanced, so the #9038S limitation is very problematic for most of us.
If the HP L/R cables are separated until the 3,5mm jack (as happens with many Sennheiser products) there aren't true reasons to use balanced connections: problems only.
I scratched the case of my #9030S-G2 (beacause, w/o 88.2kHz & 176.4kHz support,it is near useless for me: the 90% of my HiRes files are PCM converted from SACDs) from my trivial trials I think that the case is not connected to the ground: probably, to solve EMI problems, is better to start to ground the case/shield of the #9038x: from my reminiscence of the university electromagnetism exams, a not-grounded shield is an "antenna" for EMI . Please note that non-ferromagnetic shield (as aluminium) don't stop EMI very well. A ferromagnetic metal case will better to stop EMI
(aluminium is better than nothing, also because its better conductivity).
I hope you can solve another issue that is the problem about the lose of many seconds at the start of tracks with Foobar2k/WASAPI when you switch between different sampling rate files: it's a very annoying problem.
We are waiting for #9038D: please don't suggest us to get a Meizu HiFi DAC ("Pro" or/and "not pro") because it doesn't work with WASAPI "event" mode and its crosstalk @32ohms load is disappointing, whereas your product is absolutely top level as showed by your plot.
If you'll realize a Meizu-like DAC+HeadAmp (Crystal chips) with a "serious" crosstalk, I'll put my order today for my sample.
P.S: a more flexible/thinner USB-C to USB-C cable and a USB-C to USB-A adapter are very useful options to add to your #9038x products. The "Y" cable, with "softstart", is losing importance.
I think it is really good idea to use PPM scale instead of lots of zeros, .00017% = 1.7PPM that's it.
