LH Labs Pulse X Infinity technical measurements - DAC only

Discussion in 'Source Measurements' started by atomicbob, Oct 12, 2015.

  1. atomicbob

    atomicbob dScope Yoda

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    The data presented were acquired as follows:

    1. PrismSound dScope III, picoscope 5243B
    2. DAC unbalanced output RCA (Single Ended output)
    3. 100 Kohm load used for measurements
    4. 44.1 KHz sample rate, 24 bit depth
    5. USB input – Audioquest Forest
    6. Unbalance cable DH Labs Silver Sonic Air Matrix RCA
    7. Vaunix Lab Brick USB hub

    LH Labs Pulse X Infinity powered by LH Labs Linear Power Supply.
    Measurements were performed between 1 and 3 hrs of DAC power on time.
    Due to time limitations only the Single Ended DAC output was measured with FTM filter selected.
    Square wave measurements were made for FTM, FRM and TCM filters.

    Thanks to miceblue for making the Pulse X Infinity and LPS available to measure.

    Frequency Response
    20151010 pulse X infinity SE FR - FTM filter.PNG

    Frequency Response (y-axis zoom) - Both FTM (gray) and FRM (yellow / violet) filter responses shown
    20151010 pulse X infinity SE FR y axis highly zoomed - FTM - FRM filter.PNG

    Dynamic Range
    20151010 pulse X infinity SE dynamic range - FTM filter.PNG

    THD and THD+N
    20151010 pulse X infinity SE THD THD+N - FTM filter - t3.PNG

    IMD
    20151010 pulse X infinity SE IMD - FTM filter.PNG

    Crosstalk
    20151010 pulse X infinity SE crosstalk - FTM filter.PNG

    Inferred Jitter
    20151010 pulse X infinity SE inferred jitter - FTM filter - t2.PNG

    1kHz @ -90dBFS
    20151010 pulse X infinity SE 1KHz -90 dBFS - FTM filter.PNG

    1 kHz gain linearity
    20151010 pulse X infinity SE gain linearity - FTM filter.PNG

    Imaging
    20151010 pulse X infinity SE imaging - FTM filter.PNG
     
    Last edited: Oct 15, 2015
  2. atomicbob

    atomicbob dScope Yoda

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    20 Hz square wave 0dBFS 10Vpp 10ms - FTM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 10mS div - FTM filter.PNG

    20 Hz square wave 0dBFS 10Vpp 10ms - FRM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 10mS div - FRM filter.PNG

    20 Hz square wave 0dBFS 10Vpp 10ms - TCM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 10mS div - TCM filter.PNG

    20 Hz square wave 0dBFS 10Vpp 500us - FTM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 500 uS div - FTM filter.PNG

    20 Hz square wave 0dBFS 10Vpp 500us - FRM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 500 uS div - FRM filter.PNG

    20 Hz square wave 0dBFS 10Vpp 500us - TCM filter
    20151010 pulse X infinity SE 20 Hz sqr 10 Vpp 500 uS div - TCM filter.PNG

    FLIR image - DAC after 3 hrs was 96.5 deg F - LPS was 93.6 deg F
    FLIR0152.jpg

    Test setup
    IMG_0906_a.jpg
     
    Last edited: Oct 12, 2015
  3. atomicbob

    atomicbob dScope Yoda

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    reserved.
     
  4. Clemmaster

    Clemmaster Friend

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    The sound of "clean"!

    Thanks a bunch, again!
     
  5. firev1

    firev1 Friend

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    Any idea why the noise modulation at the lower midrange?
     
  6. atomicbob

    atomicbob dScope Yoda

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    I assume you are referring to the THD+N graph. If I had to venture a guess, I'd look at the Dynamic Range graph spectrum and note the spikes at 60, 120, 180, 240 ... Hz, all AC mains related.
     
  7. joch

    joch Friend

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    pardon the layman question: so the graphs show that it's good?
     
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  8. firev1

    firev1 Friend

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    Didn't expect it to degrade that much though especially since it has an extra LPSU. From the measurements standpoint, it's pretty flawless aside from the degradation in the lower midrange. If GO is anything to go by, this should sound fantastic.
     
  9. Chris F

    Chris F Boyz 4 Now Fanatic - Friend

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    Apologies for the slight off topic post but does anyone know if the filter implementation is the same on the GOv2? I tend to prefer linear phase so if the FRM filter is default on GOv2 I can probably skip buying the "infinity" upgrade.
     
  10. ultrabike

    ultrabike Measurbator - Admin

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    AFAIK, Yup. It looks pretty good. Not cheap tho.
     
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  11. Audio Zenith

    Audio Zenith Custom Title KGB

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    Have to say I much dislike Light Harmonics marketing tactics on squeezing every last penny out of the consumer after initial purchase of the base unit was already secured. All this multitude of perks and upgrades which in some cases ends up quadrupling the original price is presented down the line while customers are anxiously waiting for a product release. Very much appreciate Atomicbob's efforts and hope that he would be willing to also measure my brand new base LH Pulse unit and help us clarify the actual value of those perks/tactics.
     
    Last edited: Oct 14, 2015
  12. atomicbob

    atomicbob dScope Yoda

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    I've got quite a backlog of things to measure in the queue along with that pesky day job which can be demanding at times. However, if the base LH Pulse makes its way to my lab I will measure it. You should spend some time listening to it first. Note any changes you experience over time of DAC power on time.
     
  13. Judeus

    Judeus Facebook Friend

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    dem jitter measurements [​IMG]

    no doubt it's a good product, problem is the retail price is like $3500 if not more
     
  14. CaseyH

    CaseyH Rando

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    Retail price of the Pulse DAC Infinity is $2500
     
  15. Judeus

    Judeus Facebook Friend

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    Oh my bad I thought that was just for x, just checked it's 2399. Xfi right?
     
  16. antifocus

    antifocus Friend

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    So LHlabs lowered the MSRP? It still says $3199 on IGG.
     
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  17. Judeus

    Judeus Facebook Friend

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    Hmm maybe that's why I though it was more.


    I'd be pissed if I was an early backer, that's a he'll of an msrp drop

    Kinda fishy
     
  18. CaseyH

    CaseyH Rando

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    Did any of you pay MSRP?
     
  19. logscool

    logscool Friend

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    The MSRP for the XFI unit is $2400 as far as I know you can not purchase the X Infinity model unless you were a backer. Also the LPS adds at least another $600 MSRP. Listening to my X Infinity + LPS right now and I have to say it is very good. Worth MSRP? Probably not although I would never spend $3000+ (I say + because $3000 would be for the XFI + LPS and X Infinity is another step up) on a DAC regardless of sound so I'm not a good judge I guess.
     
  20. Judeus

    Judeus Facebook Friend

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    Isn't the X infinity = XFI??
     

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