There's a more noticeable difference with high impedance dynamic driver cans like the Senn HD600's series for example, I notice a little bit less of a difference with my LCD-X and LCD2C, is more subtle.
Aune S17 pro
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- aune aune s17 pro
SmartCheetah
500+ Head-Fier
Arya Stealth, HE1000SE. Change is there, but subtle. I doubt I'd noticed it on the fly. But it's definitely there
Greetings to the community.
I'll warn you right away, English is not my native language.
I have been the owner of Aune s17 pro for some time now.
I like the sound of the amplifier.
I've taken some measurements
and they're depressing.
In any case, the reason for the dependence of the amplifier heating on the connected cable has become clear, as I understand it, this is a global problem. But I need confirmation from the community.
And of course it is necessary to get an explanation from Aune.
The main cause of overheating
Depending on the connected cable. This is the self-excitation of the amplifier at high frequencies. From 8 to 15 megahertz.
There are many more observations.
If you are interested, please support
P/S I don't know how to post pictures here.
I'll warn you right away, English is not my native language.
I have been the owner of Aune s17 pro for some time now.
I like the sound of the amplifier.
I've taken some measurements
and they're depressing.
In any case, the reason for the dependence of the amplifier heating on the connected cable has become clear, as I understand it, this is a global problem. But I need confirmation from the community.
And of course it is necessary to get an explanation from Aune.
The main cause of overheating
Depending on the connected cable. This is the self-excitation of the amplifier at high frequencies. From 8 to 15 megahertz.
There are many more observations.
If you are interested, please support
P/S I don't know how to post pictures here.
I would be very interested about your findings. I bet there's a ton of distortion.
Unfortunately, I don't know how to place images. In general, everything is not so bad when the amplifier is working stably.
Hit this small button that looks like a picture and then drop the photos or click to search them in your computer or smartphone /tablet.
Unfortunately, the function of attaching images is not available to me. Probably temporarily.
I'll copy the RAA result tables.
Here is an example of stable operation at low gain and unstable at high gain
I'll copy the RAA result tables.
Here is an example of stable operation at low gain and unstable at high gain
| Testing device | Aune B 1KOhm Hg 50mA D90III |
| Sampling mode | 24-bit, 48 kHz |
| Interface | |
| Testing chain | External loopback (line-out - line-in) |
| RMAA Version | 6.4.5 |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -0.6 dB / -0.6 dB |
| Mono mode | OFF |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | +0.01, -0.01 | Excellent |
| Noise level, dB (A) | -118.9 | Excellent |
| Dynamic range, dB (A) | 118.8 | Excellent |
| THD, % | 0.00766 | Very good |
| THD + Noise, dB (A) | -80.0 | Average |
| IMD + Noise, % | 0.00839 | Very good |
| Stereo crosstalk, dB | -104.8 | Excellent |
| IMD at 10 kHz, % | 0.00818 | Very good |
| General performance | | Very good |
| esting device | Aune B 1KOhm Lg 50mA D90III |
| Sampling mode | 24-bit, 48 kHz |
| Interface | |
| Testing chain | External loopback (line-out - line-in) |
| RMAA Version | 6.4.5 |
| 20 Hz - 20 kHz filter | ON |
| Normalize amplitude | ON |
| Level change | -1.0 dB / -1.0 dB |
| Mono mode | OFF |
| Calibration singal, Hz | 1000 |
| Polarity | correct/correct |
Summary
| Frequency response (from 40 Hz to 15 kHz), dB | -0.00, -0.02 | Excellent |
| Noise level, dB (A) | -121.5 | Excellent |
| Dynamic range, dB (A) | 121.3 | Excellent |
| THD, % | 0.00008 | Excellent |
| THD + Noise, dB (A) | -113.3 | Excellent |
| IMD + Noise, % | 0.00036 | Excellent |
| Stereo crosstalk, dB | -116.5 | Excellent |
| IMD at 10 kHz, % | 0.00028 | Excellent |
| General performance | | Very good |
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That only will look depressing to someone who has bought other, more expensive, headphone amp 
. Probably the bad news are yet to come
. Probably the bad news are yet to comeThe sad thing is that the drop in performance is the result of interference at frequencies of 8-15 megahertz. The level and frequency depend on the cable, headphones. they work like an antenna to self-excite the amplifier. The interference level is very high.That only will look depressing to someone who has bought other, more expensive, headphone amp
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Honestly, i don't know what any of this means, is going above my head completely.
in particular, this leads to rapid heating of the amplifier. The voltage of the parasitic signal can reach several volts. and in the case of high-resistance headphones or only a 10V Rms wire
I think I found this by mere accident by what I think you're describing here, with a particular balanced cable I had for my koss kph40, the temps went up crazy fast, also with my focal clears and the stock 4-pin xlr cable it comes with, but not as bad as with the kph40.
That's not an overall problem - mine is completely cable agnostic: in 100 ma, it heats up to 69 °C in a bit less than one hour with any cable that I have (stock sennheiser, stock hifiman, stock focal, hart modular cables) or with no cable whatsoever connected.
I hope this is not a common problem. But judging by the discussion, it is available. Unfortunately, not everyone can connect an oscilloscope and see what happens on the device's screen. Often, different types of distortion are taken by listeners as an advantage.
.... In this case, with a moderate level of interference, even harmonics, however, and odd harmonics, increase sharply. This leads to the effect of softening the treble and the effect of "beautiful bass", but these are distortions.when I have the opportunity to post images, everything will be clear and understandable. (and sadly)
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Mine (without fans) gets hot just by being turned on (with just the power cable attached), and there's nothing that seems to change the heating behaviour (different cables, headphones, dacs, balanced/unbalanced, low or high gain). The only thing that matters is the current mode (50 or 100 ma). Even on 50 ma it gets to at least 62 °C.
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