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kenrothman
3
Mar 8, 2018
Does this have sufficient power to sound great with the Sennheiser HD-6XX?
LAMA
1
Mar 8, 2018
kenrothmani was wondering about that too, mine are gonna arrive in the next few days
kenrothmanIf output voltage is as such, 2 volts RMS (5.7 volts peak-to-peak), then you should be fine. Even a bit under 2 would be OK at lower listening levels.
TonyRizo
179
Mar 8, 2018
kenrothmanNo, a 300ohms HP needs a minimum of 63mW output power at the HP to run decent. This one puts out 57mW. Not good.
david_abadia
35
Mar 8, 2018
kenrothmanI own a Oppo Ha-2 (Gen.1) and it´s output 30mW into 300 Ohm, and for me it´s enough, even that i don´t listen at too high volume, but I put it on 4 out of 5, and for me its really high. but I also own the AUNE T1se and I find it more dinamic and better bass punch, at low listening volume, so the point it´s not only to been able to give enough power to have high listening volume, but also how it will scale with better gear. But if I would not have the AUNE the Oppo would be fine, and It´s a real improvment from a laptop or a phone. So in conclusion I guest this is more than enough to drive it, but with a better gear the 6xx scale and improve, a bit in my opinion.
bhuys
7
Mar 9, 2018
kenrothmanHi, I use the NX4 DSD with the HD6XX. I am impressed with the performance. Drives them well, even at normal listening levels. Also pairs wel with low impedance IEMs. The sound is clear, detailed and slightly warm of neutral. The 9038 dac sound better than other 9018 based dacs I own (or it's a better implementation).
wlice
1
Mar 10, 2018
TonyRizoThis one is not 57 mW. From specs: "Output power: 293 dB x 2 at 32 ohms, THD+N <1%; 114 mW x 2 at 300 ohms, THD+N <1%"
A community member
Mar 11, 2018
TonyRizoHow did you arrive at that number?
TonyRizo
179
Mar 11, 2018
By reading this... Maybe I am understanding it wrong? THD+N (A-weighted): <0.0009% at 1 kHz output = 140 mW (32 ohms), <0.0037% at 20 Hz–20 kHz output = 140 mW (32 ohms), <0.00046% at 1 kHz output = 57 mW (300 ohms), <0.0005% at 20 Hz–20 kHz output = 57 mW (300 ohms)
A community member
Mar 11, 2018
TonyRizoSorry, @TonyRizo, I should have been more clear. How did you arrive at the conclusion that "a 300ohms HP needs a minimum of 63mW output power at the HP to run decent"?
jaydunndiddit
3262
Mar 11, 2018
kenrothmanThese are the power requirements for the 650/6XX: SOURCE REQUIREMENTS: The HD 650 has a high impedance (300 ohms) and needs more voltage than most portable devices and PC headphone outputs can provide. Generally you need about 2 volts RMS (5.7 volts peak-to-peak) for wide dynamic range music at realistic levels. PC and portable audio gear is typically limited to around 1 volt or less with many managing only about 0.5 volts. So you might need a headphone amp. While the 650 may deserve better, even the $20 FiiO E5 can manage about 1.3 volts which might be enough for many tastes. The FiiO E9 can do a great job with the 650 as its 10 ohm output impedance is relatively insignificant compared to 650’s 300 ohms and the E9 has a very healthy 7 volts of output.
Full article here: http://nwavguy.blogspot.com/2011/06/sennheiser-hd-650.html?m=1
TonyRizo
179
Mar 11, 2018
Oh, I read it on Headfi at one time, a person that appeared to be very knowledgeable on impedance and how all of it works. He gives the run down to a t. You can probably search for it on Headfi forum.
A community member
Mar 11, 2018
TonyRizoYou are referring to this thread/post? https://www.head-fi.org/posts/11824662/
His calcs are not wrong, but they refer to power required to accommodate 115 dB peak levels. That is really f'ing loud.
In my experience, the HD6xx get plenty loud from only 2 Vrms or about 12 mW.
To reach a loud, safe level of 105 dB peak volume (90 dB avg volume), only about 5 mW is needed.
A great resource is here - https://diyaudioheaven.wordpress.com/tutorials/power-impedance-etc/ Tabulated data is here - http://www.mediafire.com/view/dzwe1g73q6pbhnx/headphone%20power%20table.pdf
TonyRizo
179
Mar 11, 2018
No, I can't find where I read the breakdown numbers but I can tell you that my Fiio X7mk2 supplies 17mW of power onto my 300ohm Sennheiser hd600 and it does not run them good. However on balanced mode the Fiio supplies 63mW of power onto my 300ohms and it runs well enough. So I would not buy anything with less than 63mW if using 300ohms. I'm not a tech so you can take this for a grain of salt but the proof is in the pudding for me as I have been able to compare. As I own the hd600 at 300ohms and the Fiio X7mk2 dap.
A community member
Mar 11, 2018
TonyRizoI believe you. However, power output is not the full story - it's the voltage of your source and how much current it can source before clipping. When you listen in balanced is your volume maxed out? No? Then you're not using 63 mW. Volume dials are also seldom linear in power levels...
Using specs from here - http://fiio.net/en/products/71/parameters - in single ended mode the X7 mk2 has 6Vpp or 2.1 Vrms. In balanced mode you have 10Vpp or 3.4Vrms. Both specs are less than is available for the NX4 DSD (2.9Vrms low gain, 5.8 Vrms high gain).
I'm not saying one is better or worse, but they should drive the hd6xx equally well (and loud!). However, your understanding of what the specs mean is a little off. Happy listening, at any rate!
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