Cavalli Liquid Crimson technical measurements

Discussion in 'Headphone Amplifier Measurements' started by atomicbob, Nov 28, 2017.

  1. atomicbob

    atomicbob dScope Yoda

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    Liquid Crimson technical measurements

    If you are unfamiliar with audio measurements please use a search engine with the query:
    "audio measurements" or "audio measurement handbook"
    Look for publications by Richard C. Cabot and also by Bob Metzler, both from Audio Precision. There are other useful publications as well. These will provide basic knowledge.
    Interpretation of the following measurements is beyond the scope of this post.

    The data presented were collected as follows:

    1. PrismSound dScope III, picoscope 5243B
    2. 300 ohm loads used for measurements to 4XF connector on Liquid Crimson
    3. Unbalanced cables Worlds Best Cable Gotham GAC-2 RCA
    4. Vaunix Lab Brick USB hub for measurement equipment
    5. 0 dB gain @ 0.775 Vrms 0 dBu except as noted, typically -16 dBu (0.122 Vrms)
    6. Liquid Crimson gain switch set to High
    7. Liquid Crimson gain knob at approximately 12:00 to achieve 0 dB gain
    8. Shielded power cords for all equipment

    Reference:

    0.775 Vrms @ 30 ohms is 20 mW producing approximately 101 dB SPL in HE-500 with sensitivity of 89 dB/mW
    0.775 Vrms @ 300 ohms is 2 mW producing approximately 101 dB SPL in HD650 with sensitivity of 98 dB/mW
    0.122 Vrms @ 300 ohms is 50 uW producing approximately 84 dB SPL in HD800 with sensitivity of 97 dB/mW


    Highlights:
    Extraordinarily clean; low residual noise, high bandwidth, fast transient response, low distortion.
    This is one of the few amps that will never depart my acoustic lab inventory.

    Picture of the Audio Lab setup for Liquid Crimson / Bottlehead Crack
    DSC_0005a.jpg

    300 ohm load part 1 of 3


    Liquid Crimson square wave 20 Hz 2 Vpp 10 mS / div 300R load
    20171128 SigGen LiqCrim 20 Hz square 2000mVpp 10mS div 100KHz filter 300R.png

    Liquid Crimson square wave 20 Hz 2 Vpp 10 uS / div 300R load
    20171128 SigGen LiqCrim 20 Hz square 2000mVpp 10uS div 100KHz filter 300R.png

    Liquid Crimson square wave 20 Hz 2 Vpp 1 uS / div 300R load
    20171128 SigGen LiqCrim 20 Hz square 2000mVpp 1uS div 10MHz filter 300R.png

    Liquid Crimson amplitude - phase - gain (A01) 300R load
    20171128 Liquid Crimson A01 amplitude - phase - gain 300R.png

    Liquid Crimson signal to noise (A07) 300R load
    20171128 Liquid Crimson A07 SNR 300R.png

    Liquid Crimson THD+N THD nth harmonic distortion (A04) 300R load
    20171128 Liquid Crimson A04 THD+N  THD  nth-HD 300R.png

    Liquid Crimson THD+N THD nth harmonic distortion (A04) with FFT 300R load
    20171128 Liquid Crimson A04 THD+N  THD  nth-HD FFT 300R 4XF.png

    Liquid Crimson Crosstalk (A08 A09) 300R load
    20171128 Liquid Crimson A08 A09 Crosstalk 300R.png
     
    Last edited: Nov 29, 2017
  2. atomicbob

    atomicbob dScope Yoda

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    300 ohm load part 2 of 3

    editorial - I believe there is a tendency to focus too much on numbers such as THD attempting to reduce a complex topic to a single number representing a sort of goodness rating. Graphs can present far more data conveying a better understanding of the measurement over a range of frequency, levels, etc.

    Here are graphs for the various measurements

    Liquid Crimson Frequency Response and Interchannel Phase pg 1/2 300R load
    G2_L1T2_1_A.png

    Liquid Crimson Frequency Response and Interchannel Phase pg 2/2 300R load
    G2_L1T2_1_B.png

    Liquid Crimson Gain vs Amplitude Left 300R load
    G2_L1T3_1_A.png

    Liquid Crimson Gain vs Amplitude Right 300R load
    G2_L1T3_1_B.png

    Liquid Crimson THD+N vs Frequency Left 300R load
    G2_L1T5_1_A.png

    Liquid Crimson THD+N vs Frequency Right 300R load
    G2_L1T5_1_B.png

    Liquid Crimson THD+N vs Amplitude Left 300R load
    G2_L1T6_1_A.png

    Liquid Crimson THD+N vs Amplitude Right 300R load
    G2_L1T6_1_B.png

    Liquid Crimson Crosstalk Left to Right vs Frequency 300R load
    G1_L1T10_1.png

    Liquid Crimson Crosstalk Right to Left vs Frequency 300R load
    G0_L1T11_1.png
     
    Last edited: Nov 28, 2017
  3. atomicbob

    atomicbob dScope Yoda

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    300 ohm load part 3 of 3

    Liquid Crimson THD THD+N vs Frequency with 1 KHz spectrum Left and Right 300R load
    20171128 Liquid Crimson THD THD+N vs Freq 300R 4XF.png

    Liquid Crimson 1 KHz spectrum Left and Right 300R load
    20171128 Liquid Crimson 1 KHz THD+N THD FFT 0dBu 300R 4XF.png

    Liquid Crimson 50 Hz + 7000 Hz spectrum Left and Right 300R load
    20171128 Liquid Crimson 50+7000Hz 0dBu 300R 4XF.png

    Liquid Crimson 600 Hz + 1700 Hz spectrum Left and Right 300R load
    20171128 Liquid Crimson 600+1700Hz 0dBu 300R 4XF.png

    Liquid Crimson IMD spectrum Left and Right 300R load
    20171128 Liquid Crimson 19+20KHz -16dBu 300R 4XF.png

    Liquid Crimson residual noise spectrum Left and Right 300R load
    20171128 Liquid Crimson residual noise A=0dB 300R 4XF.png
     
    Last edited: Nov 28, 2017
  4. atomicbob

    atomicbob dScope Yoda

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    reserved 4/7.

    30R measurements will go in posts 4 through 6 when I have time to measure again.
     
    Last edited: Nov 29, 2017
  5. atomicbob

    atomicbob dScope Yoda

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    reserved 5/7.
     
  6. atomicbob

    atomicbob dScope Yoda

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  7. atomicbob

    atomicbob dScope Yoda

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  8. ultrabike

    ultrabike Measurbator - Admin

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    Holly Liquid Crap Bob! Diz not possibl. Not at room temperature.

    Open up the amp and you will see all the Mikhail in it. Board of the wrong color. Solder paste, toothpaste and tomato paste all over. Everything in this amplifier is a bad choice. If this thing uses JFETs, FETs, MOSFETs, BJTs, BJs, HJs, and/or MILFs they are all mismatched. It also sports the wrong choice of everything. Inputs, outputs, and whatever goes on the middle is wrong. The casing is also the wrong metal. The volume knob uses the wrong alloy. The amp is too heavy and too light, all at the same time.

    This is fake news Bob. Your equipment and ears are lying to you. I haven't heard the amp, but I know so.

    [​IMG]
     
    Last edited: Nov 28, 2017
  9. ultrabike

    ultrabike Measurbator - Admin

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    BTW, great job Bob, and thanks for all the good stuff that you do.
     
  10. Armaegis

    Armaegis Friend

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    What am I going to do with the pretty pretty graphs for things that I can't ever get?
    Is there a word for audiophile blue balls?
    It's probably German if there is one.
     
  11. Luckbad

    Luckbad Traded in a unicorn for a Corolla

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    I am listening to those measurements right now. It really does wow with how clean it is.
     
  12. sorrodje

    sorrodje Carla Bruni's other lover - Friend

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    L.O.L !
     
  13. atomicbob

    atomicbob dScope Yoda

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    You can compare them to the graphs for the MCTH when I obtain one and measure it.
     
  14. purr1n

    purr1n Desire for betterer is endless.

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    Square wave looks good. I heard square waves are the the one measurement that rules them all. I am happy.
     
  15. Vansen

    Vansen Gear Master (retiring)

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    Ah, the square wave hard on is strong with this amp. It looks photoshopped, but I don’t care.
     
  16. gixxerwimp

    gixxerwimp Professional tricycle rider

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  17. aamefford

    aamefford Nothing like chamberpot coffee

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    @atomicbob, thank you for doing this. The amp is out of production and heading toward unobtanium, but it is also kind of a cult thing, and there are a few owners around, and several that have heard it. It seems to be a solid reference.

    Edit - stock Genalex?
     
  18. Luckbad

    Luckbad Traded in a unicorn for a Corolla

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    Genalex is a safe bet since he never rolled that tube out. I switched back to it for now as well.
     
  19. Cellist88

    Cellist88 Friend

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    massdrop x liquid crimson seems to be the solution ><.
     
  20. atomicbob

    atomicbob dScope Yoda

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    Yes, stock Genalex. Sounds pretty good to my ears.
     

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