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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. t4t3r
    Love my A100 but I have a feeling I’ll be hitting the Join button before the MD timer flips over to the next day...
  2. Lasakro
    Does anyone have a link to the balanced output pin-outs? I need to make a cable before the amp arrives.
  3. BucketInABucket
    I plan to possibly downsize my dac too, currently have a theta dspro basic iiia...
  4. rkw
  5. Alcophone
    Good news on the button issue! I was told that the amp has a protective circuit that makes the button unresponsive for five seconds after pushing it. And waiting long enough between using the button indeed restores its functionality for me. It seems that pulling the button simply increases the likelihood of waiting long enough between button pushes.

    This could definitely be indicated much more clearly, though with regular use it's probably a non-issue. Turn it on, use it for a long time, turn it off.
    omniweltall and CEE TEE like this.
  6. oqvist
    Wait you didnt even wait 2 seconds for it to switch on before you tried again and thus switched it off?
  7. smallcaps
    Anyone running the 789 with the SU-8? Impressions and comparisons would be greatly appreciated. Cheers
  8. Alcophone
    In normal use, I did, but not when I was trying to figure out whether the button works after reading about issues here (which was before I received mine).
  9. Nosaj1969
  10. Malcolm Riverside
    First time I heard this combo I was floored by the resolution and clarity on display. The THX doesn’t add much in terms of depth of sound or expand the Utopia’s somewhat limited soundstage however the imaging is spot on. There’s definite synergy between the Utopia and the THX. My strong first impression (for a minute I was wondering if the THX could replace my HPA V281 in my chain!) has cooled a bit but I still think the THX makes a good solid state pairing with the Utopias. I’d avoid dacs that add too much brightness to the chain though as both of the Utopias and the THX lean toward that end of the spectrum. I’d also make sure to have a balanced cable on hand to take advantage of the extra power the THX offers through that output. Overall though, a very clean, engaging sound that I’d recommend to Utopia owners. Especially for the price!
    gtbrown50, Fatdoi and Gavin C4 like this.
  11. Nosaj1969
    I have this combo. It's excellent. I'm using a Litte Bear switch to allow me to A/B between my Audio-gd R2R 1 and the SU-8. The sound is very comparable, the Audio-gd is better overall mainly in transparency and openness, but at 1/3 the price I don't think you'll find better in a balanced DAC. It's pretty exceptional. I bought two actually so that I can enjoy one at work! It will definitely be better I than the balanced SDAC which is not dual mono. Also, you get the added abilities for the SU-8 llike filters and volume control via the remote, although I have not played at all with the different sound filters.

    Good luck to you!
    smallcaps likes this.
  12. snip3r77
    What is the THX soung signature?
  13. Oublie
    Got my new toy first comparisons show it to be flat as a pancake and essentially a wire with gain I doubt there will be a better bargain out in headfi land for a while. I need a better dac lol. BTW anyone know where I can find cases the same size and style I want to build a switching matrix for all my gear and possibly linear psu's?
  14. alphanumerix1
    Does the 789 have any sound sig?
  15. oqvist
    This is impossible to say. But it works splendid with a wide range of headphones so doubt it has any major colourations.

    It kind of feels like it has someone kind of velvet filter there is no sharpness anywhere particularly on my rme adi-2 at default settings. Maybe the error corrections in the works
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