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Massdrop x THX AAA™ 789 Linear Amplifier - Impressions Thread

Discussion in 'Headphone Amps (full-size)' started by XERO1, Mar 1, 2018.
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  1. greenmac
    A question For any UK users, what power block/adapter are you using as mine has arrived with US plug only

    Thanks
     
  2. escalibur
    Sure there is also a 'human part' where some can hear the difference and some not. However in the age of THX 789 and soon to be released THX 887 I wouldn't run for Jotunheim at this moment. Of course everyone on his own. :)
     
    cardeli22 likes this.
  3. aloki
    I just got my THX 789 and I was wondering:

    If I plug two of the same headphones, say Oppo PM-3 (26 ohm impedance and 102 dB in 1 mW sensitivity); one into 3.5mm SE and the other into 1/4in SE, would I run the risk of damaging any of my equipment?

    I want to connect my Modi 3 to the THX, and run the passthrough to my Magni 3 (my previous set up was the Schiit stack) to create sort my own subjective little test bench: Use the Oppos in the THX to see if I hear any difference between the two Oppos (to set the control/base level standard) and then run the Oppos between the Magni and THX to see what differences I hear between the amps, note those differences and then run different kinds of headphones through the Magni and THX to hear any differences there may be, ascertain which pairings I like better, and such.

    The first step is making sure I don't damage anything in establishing the control for my future tests.

    Any input is appreciated!
     
  4. Fat 5miley
    I changed the power cable to one with a UK plug
    You can get cheap ones from ebay, search for IEC C7 power lead
     
  5. ayang02
    S.M.S.L SP200 THX AAA 888. I wonder if it's another 789 clone. At least this time around, the form factor looks smaller.
     
  6. eeagle
     
    aloki likes this.
  7. TJ Max
    The Sony MDR-Z7m2 are probably the best fit for the THX 789 over the other headphones I tried. Beyerdynamic T1 and T5P, and Sennheiser HD579
    I'm going to be the odd one and admit that the THX 789 is a very clinical sounding amp. It benefits from being either connected to a source / DAC or headphones with a distinct sound signature that the listener prefers. If the source and headphones are near flat and neutral, the THX 789 with do no favors. I found the sound to be a bit boring, and I'm not convinced that a near flat musical presentation is what was intended in the recording studio. It may work for full sized speakers interacting with a room, but not for headphones.
    I'm currently using a Bluesound Node 2i connected by digital coax to a Schiit Gungnir Multibit dac using its single ended output to the THX 789, I do have the option of going completely balanced, but the sound comes across a harsher to my ears. I am however borrowing the balanced headphone cable from Beyerdynamic. It's of good quality. Looks better than Sony's, and cost about $180 cheaper and fits the MDR-Z2 perfectly. The Balanced output is fine, with a single ended input. To get a less clinical sound though I added my Schiit Loki Equalizer into the chain. And I'm sorry but I had to put on a bit of a smiley faced EQ because I like enjoying my music in addition to just listening to it's sound.

    thx789SonyLoki.JPG
     
    Last edited: Sep 19, 2019
    cardeli22 and trellus like this.
  8. alpovs
    ayang02 likes this.
  9. ayang02
    cardeli22 and alpovs like this.
  10. protoss
    Anyone here keeps the THX789 on all day?

    Is it okay to leave the unit on all day long?
     
  11. PointyFox
    No, you're wasting power.
     
    protoss likes this.
  12. Fatdoi
    .
     
    Last edited: Sep 21, 2019
  13. protoss
    Anyone using a different power cable/brick with the THX789? Custom 3rd party powercable/brick?
     
  14. RussW
     
    cardeli22 likes this.
  15. kelvinwsy
    I just got my 789 4 days ago hv run it in with the following 24v 2.89amp Linear PSU .. Sounding great from a SMSL VMS D2 Balanced dual ESS0938 pro chip DAC. HP Verum 1 gives good balance of dry sound of the 789 with the richer sound of the Verum ..
    Enough power for the inefficient HE560's too
     
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