Recent content by Jensigner
  1. Jensigner

    Approximating Headphone Volume Output (dB)

    Quote: Glad to help out in some way. Related to audio level, I recently have built some basic gear to verify audio specs (typically "A-Weighted in a 20 kHz BW" noise and S/N) of some audio equipment I have. This is a very interesting area and opinions are strong (as you can see from the...
  2. Jensigner

    Approximating Headphone Volume Output (dB)

    Quote: Assuming roughly that at 60 ohm load, we have ~ max output voltage of 3.3Vrms, then here are some results:   A 2 dB step per volume increment means the output voltage factor is reduced by a FACTOR of 0.794  (or the POWER is reduced by a factor of 0.631).  So, these are the output...
  3. Jensigner

    Approximating Headphone Volume Output (dB)

    Quote: Yes I agree with that. I think the only useful comparison (and it is only at one frequenc so is really of limited practical use and give a very rough idea of overall "loudness") is the spec'd dbSPL at 1 kHz for either 1 mW or 1Vrms. Being a Physicist, I like to "assume it's a sphere"...
  4. Jensigner

    Approximating Headphone Volume Output (dB)

    Quote:   Thanks for the useful comments and reference. I'll check it out. dBL as in: "Unweighted sound pressure level is called "linear sound pressure level" and is often written as dBL or just L"  (wiki info). I didn't measure the rms voltage with a voltmeter. I wrote an...
  5. Jensigner

    Approximating Headphone Volume Output (dB)

    My understanding is that the dBSPL ratings of headphones/iems are ALWAYS given as either dBSPL / 1Vrms (at 1 kHz)  or dBSPL / 1mW (at 1kHz) irrespective of how ear damage threshold values are specified (i.e. if they are A-weighed or not). Is this true?   Also, I was interested in comparing...
  6. Jensigner

    HD598 Is their spl rating per Vrms or per mW?

    According to my HD598 box, the spl is stated as being 112 dB @ 1kHz and 1Vrms. However in several places including a review, I see the spl rated as 112 dB /mW for the HD598. Obviously they can't both be correct with the nominal 1kHz impedance being ~ 50ohm. If 112 dB/1Vrms is correct that...
  7. Jensigner

    RMAA Comparison: FiiO E17 Alpen and E12 Mont Blanc

    The main ADC on the X-Fi Elite Pro sound card I use is the AK5394 (123 dB 192kHz/24bit) which is very good for a sound card. At any rate, using a simple loop-back (sound card line-out to line-in) this is my measurement capability (at least based on RMAA which i realize overstates the Xtalk)...
  8. Jensigner

    RMAA Comparison: FiiO E17 Alpen and E12 Mont Blanc

    A more detailed frequency response plots comparing E17 and E12:  http://www.jensign.com/FiiOE17/BodePlots Note that the low frequency peak with Bass enabled for the E12 has been moved to higher frequency (~ 50Hz) compared to earlier version.
  9. Jensigner

    RMAA Comparison: FiiO E17 Alpen and E12 Mont Blanc

    Quote: I haven't tried that but the L7 line-out adapter for the E7/E17 probably won't work with the E12 since the E12 doesn't have a DAC.  That Creative sound card has a very good line-in A/D which I have characterized and used extensively (although the line-out of that sound card limits...
  10. Jensigner

    Reply to review by 'jensigner' on item 'FiiO E12 Mont Blanc'

    according to FiiO, this is their new style case which they say is waterproof and can prevent mildew. They have stopped production of the older-style flannelette case
    • Jensigner
    • Head Gear rating reply
  11. Jensigner

    Reply to review by 'jensigner' on item 'FiiO E12 Mont Blanc'

    Carrying cases for E17 and E12 http://www.jensign.com/FiiOE17/pouches.jpg
    • Jensigner
    • Head Gear rating reply
  12. Jensigner

    Reply to review by 'jensigner' on item 'FiiO E12 Mont Blanc'

    nice review. I just got one. The carrying pouch isn't like the one you show but is sort of more elastic and holds the E12 in very nicely (with a velcro wrap-around strap). Also the pouch doesn't have the FiiO logo on it. Anyone else have this type of case?
    • Jensigner
    • Head Gear rating reply
  13. Jensigner

    RMAA Comparison: FiiO E17 Alpen and E12 Mont Blanc

    You can really notice the E12s uneven frequency response, with a slight grade at ~ 1 kHz. Measurements are with 33 ohm loads and with line-in level ~ 1.0Vp and gain adjusted to get ~ 2.5Vpeak headphone output:   http://www.jensign.com/FiiOE17/RMAA/CompareE17E12/Compare_E17_E12.htm
  14. Jensigner

    FiiO E17 RMAA results

    another tidbit ... tested the coax SPDIF input and it is (probably not surprisingly) identical to the optical SPDIF input. This just verifies that there is nothing odd occuring between optical/electrical digital conversion. The RCA/phone-plug adapter provided with the E17 sits with about 1mm+ ...
  15. Jensigner

    FiiO E17 RMAA results

    Quote: Here are some more tests of my E17 for the line-in connection comparing 16bit/44.1kHz with 24bit/96kHz:    http://www.jensign.com/FiiOE17/RMAA/LineIn/ComparisonE17_LineIn.htm Loaded into 33 ohm and at a headphone output level of 1.8Vrms. Unless I misunderstand the InnerFidelity...
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