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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. Th3Drizzl3
    i went ahead and ordered a second one im hoping this is a nice as it seems. ill use one at my office and the other with my full complete massdrop stack (so far every product in the housing style) for the price this thing sounds like it may be a killer lower priced amp. i think ill be fine with the change to the gain i dont know though i like both options lol would have been killer just to add the negative option along with the others and adjust the cost a bit.
    Last edited: Aug 15, 2018
  2. ufospls2
    My DAC is 3v from the SE outputs, 6v from the XLR, but it can be turned down. I'd be using the 4 pin XLR output. I was thinking of using the amp with really hard to drive headphones, so the high gain was attractive. My old amp had +24db gain as well.
  3. AndrewM888
    I recommend using your 6V XLR output (bal XLR is always better) and setting the 789 amp to 0dB gain. Then you'll achieve 6V from amp TRS or 12V from amp XLR4. Yes that's 1.3dB less than the full 7/14V amp clean capability, but will give you super clean SNR. And it will be ridiculously loud.
    omniweltall and cardeli22 like this.
  4. Por_Tu_Guy
    I see these shipped out a week ago any body received their amps yet?
    Any impressions to share?
    cardeli22 likes this.
  5. Baten
    Por_Tu_Guy likes this.
  6. FunctionalDoc
    I got mine on Tuesday and been enjoying the dead quiet aspect and amazing speed on my Auteur's. I having issue with using the balanced XLR input getting a ground hum and not knowing if these new custom interconnect cables have a wiring issue or a problem on outputs on my Topping DX7S . I ordered a pair of XLR interconnects from amazon to see if I still have a ground loop hum. I used high gain on my Auteur's and was at 10-1 o'clock volume position and that was plenty loud.

    The amp is much heavier then I thought and it is put together very well for a $350 amp.

    The amp shipped from New Jersey and I live in Ohio.
    mtmercer, Por_Tu_Guy and Baten like this.
  7. heliosphann
    Still waiting for mine to be delivered. Massdrop uses a fleet of giant tortoises to send out their packages.
    Por_Tu_Guy and cardeli22 like this.
  8. Alcophone
    Mine is scheduled for tomorrow.
    Edit: actually out for delivery today. Originally scheduled for two days from now. Woohoo!
    Last edited: Oct 25, 2018
  9. heliosphann
    Yea, mine was too. I'll hook it up tonight when I get home!
    CEE TEE likes this.
  10. Shredicus
    Lol, the tortoises heard you!
  11. heliosphann
    Got my THX AAA 789 delivered today.

    Unfortunately I can't get the unit to power on at all. Went to hook it up and I'm pretty sure the power button is defective. It won't "catch" when you depress it. It just pops right back to it's initial resting place.

    Looks like I'll have to wait a little longer... *sigh*
    cardeli22 likes this.
  12. FunctionalDoc
    Bummer . I guess I am lucky mine is working .
  13. Daemon Ursus
    The switch doesn't catch, its just a button because it has an auto off setting. Make sure its plugged in properly, and then just fully depress the button, you should get a teeny tiny little red led in the middle of the amp that turns white after a second.
    cardeli22 and heliosphann like this.
  14. heliosphann
    Ah, thanks. That makes sense.

    Well, looks like it's just DOA then. Or possibly the power supply? I might try to test it.
    Last edited: Oct 25, 2018
  15. Alcophone
    Mine is partially borked, too. Often, pressing the button doesn't do anything. Sometimes, toggling the auto off setting helps and the next time the button will turn the unit on, and can turn it off again before refusing to work again. Sometimes, disconnecting and reconnecting the power supply helps, too. Not really consistent.
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