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  1. skip129

    Just tried my Senn. 598 with my receiver... I think I might need an amp. everywhere else now.

    It would be interesting to know the output impedance of this receiver. The HD598 has a large variation in impedance with frequency, and if the receiver has a high output impedance, it could be colouring the sound, and the sound you get with a high quality low impedance headphone amp may not be...
  2. skip129

    New Products from Firestone Audio -- the FireKey Line

    Does the GreenKey support USB 2?
  3. skip129

    New Products from Firestone Audio -- the FireKey Line

    If you weren't having any noise/interference problems without the GreenKey, it's not going to do anything else to improve the sound I don't think.
  4. skip129

    FiiO E17 "ALPEN" - First Impression + Final Thought

    OOPS!! The spec is 20mW, as I said, so the correct calculation is: 10*log(20mW/1mW) = 10*log(20) = 13dB gain.   97 + 13 = 110dB SPL   110dB SPL plus into the HD600.   Greg.    
  5. skip129

    FiiO E17 "ALPEN" - First Impression + Final Thought

    Assuming the E17 allows the maximum output voltage swing for a full scale signal on the USB, that means it can generate >= 20mW into 300 ohms, and since the HD600 is in fact 300 ohms, that means >= 20mW into the HD600. The HD600 has an efficiency of 97dB @ 1mW. The gain at 10mW is...
  6. skip129

    Amp for 600 ohm K240's

    The 600 ohm DT880's appear to be significantly more efficient than the K240 - 96dB/mW vs 88dB/mW.   http://asia-pacific-india.beyerdynamic.com/shop/hah/headphones-and-headsets/at-home/music-pleasure/dt-880-edition.html   (the "nominal SPL" does mean the SPL at 1mW - I checked with Beyer)...
  7. skip129

    Clarification of Corda 2Stepdance input impedance needed

    Ah - is it 120K in low power mode, and 17K in high power mode? That would make more sense.
  8. skip129

    Clarification of Corda 2Stepdance input impedance needed

    What does "120 / 17 Kohm" mean, for the input impedance spec for the Corda 2Stepdance? 17K looks right, but what does the 120 mean? Is there an option to configure it for 120 ohms input impedance? If so, I don't see any mention of that in the manual.   Greg.
  9. skip129

    iBasso D6 "Fer-de-Lance" USB DAC/Amp

    Quote: I am satisfied with my AKG K601 headphones connected to my NAD 320BEE integrated amp, thankyou very much.   Greg.  
  10. skip129

    amp for AKG Q701

    Note that there are no power specs that I can see for the amp. So, I don't know whether it can reach 11 volts peak-peak with your headphones.   Also missing is the output impedance of the amp.   So, the actual level achievable with your headphones may be less than the ideal maximum I...
  11. skip129

    amp for AKG Q701

    IMHO, it will be able to generate approximately 117dB SPL into those headphones, and will easily be loud enough. This is just going by the raw specs though.   The maths: 11Vp-p = 11/2/sqrt(2) = 3.89V RMS. Sensitivity of the headphones: 105dB/V   Gain in dB at maximum output of the amp...
  12. skip129

    FiiO E6 Amp question

    Ah, fair enough then.    Just as an aside, does anyone have a pointer to the electrical specifications for the Monster Turbine Pro?
  13. skip129

    Need DAC/amp under $250 for DT880/ 250

    Good luck, and I'd appreciate your opinion when you've had a listen.........
  14. skip129

    Need DAC/amp under $250 for DT880/ 250

    The adaptor is not essential. It won't make a HUGE difference. It is just to get the most out of those very high quality headphones. The headphones will still be very good WITHOUT the adaptor.   I'm sorry for overwhelming you with information - I did not want to do that.   Greg.
  15. skip129

    Need DAC/amp under $250 for DT880/ 250

    The adaptor may, in theory, change the frequency response of your headphones - it may make it closer to what the Beyerdynamic engineers designed the headphones to sound like.  As I said, Beyer's own headphone amp - the A1, has an output impedance of 100 ohms, wheres all these amps we have been...
  16. skip129

    Need DAC/amp under $250 for DT880/ 250

    FWIW, here's a 100 ohm adaptor: http://www.zombie-x.com/zxamateurcablesrev2/index.php?main_page=product_info&products_id=199     (sorry - I don't know anything about the surround audio stuff)   Greg.
  17. skip129

    iBasso D6 Volume Impression...where's the beef?

    Sorry - having now re-read their email, I do believe they have confirmed that it is a peak voltage of 4.56V  They said it's less than the PEAK TO PEAK voltage, but more than the RMS voltage. This is quite clear to me the PEAK voltage (which is of course half of the PEAK TO PEAK voltage).  ...
  18. skip129

    iBasso D6 Volume Impression...where's the beef?

    According to iBasso, the "max" voltage is indeed 4.56V. However, we are at loggerheads over what this means. They insist that it is NOT peak, and it is NOT RMS. It is "max".  I'm going to assume for now that we have a language barrier, and they really do mean "peak".  They have also re-confirmed...
  19. skip129

    iBasso D6 "Fer-de-Lance" USB DAC/Amp

      @Allforheather, I agree with you completely, and in fact, iBasso kind of indicated to me that the maximum is only achievable when using the D6 as an analog amp. However, the reason they gave for that is that the DAC output is only 1.2V. (they didn't specify peak or RMS - I guessed peak, as...
  20. skip129

    iBasso D6: Does it work well with ASIO4ALL?

    Has anyone tried the iBasso D6 with the ASIO4ALL driver? If it does work, how small can you make the ASIO buffer? I'd probably need 256 samples or less @44.1kHz.   Thanks, Greg.
  21. skip129

    Bass clipping (I think) on HD 595 -- looking for advice

    I've just discovered that I have probably been using the sensitivity specification for the K601 as the efficiency specification.  ;^) Here are the specs for the K601: http://www.headphonesolutions.com/akg-k601-wired-headphones.html   Am I correct in saying that these specs only provide the...
  22. skip129

    Bass clipping (I think) on HD 595 -- looking for advice

    And yes - another thread bump.   I was still a bit uncomfortable about this V-Can/K601 clipping issue. As you can see in my previous reply, I had put it down to a clicking sound in my ears (eustacian tubes). There's no doubt that my ears DO make little clicking sounds if I wiggle my ears in...
  23. skip129

    FYI: Here's a quick & dirty impedance (sort of) vs frequency curve for AKG K601 headphones.

    Thankyou!  I've actually emailed headroom.com asking them for the plot, but you've now saved me the trouble!  :) (I didn't know about the archive - see that I could have accessed the archive myself - great stuff)   Greg.
  24. skip129

    FYI: Here's a quick & dirty impedance (sort of) vs frequency curve for AKG K601 headphones.

    I forgot to mention that without the loading of the K601, the frequency response was very flat.    Also, if someone does have a pointer to a proper impedance vs frequency plot for the K601, please advise - thanks.   Greg.
  25. skip129

    FYI: Here's a quick & dirty impedance (sort of) vs frequency curve for AKG K601 headphones.

    I couldn't find an impedance vs frequency plot for the AKG K601 headphones, so I did a quick test. I connected the K601 to the headphone output of a NAD 320BEE integrated amp, the line out from a soundcard to the line in of the NAD, and the headphone output, in parallel with the K601, back to...
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