Official THX Measurements of the Massdrop x THX AAA 789

[The Jniac]

Source here, originally posted on Massdrop here
EDIT: The THX representative confirmed that the distortion measurements are 20Hz-20kHz. I am now wishing I had bought one.
EDIT 2: Updated the 16 Ohm balanced output frequency response graph.

Spoiler: Balanced Output

Spoiler: 1kHz Spectra

1mW @16 Ohms

1mW @ 32 Ohms

1mW @ 300 Ohms

100mW @ 16 Ohms

100mW @ 32 Ohms

100mW @ 300 Ohms

Spoiler: 10kHz Spectra @ 100mW

16 Ohms

32 Ohms

300 Ohms

Spoiler: Frequency Response

16 Ohms

32 Ohms

300 Ohms

Spoiler: IMD DFD @ 100mW

32 Ohms

300 Ohms

Spoiler: THD vs Output

16 Ohms

32 Ohms

300 Ohms

 

[The Jniac]

Spoiler: Unbalanced Output

Spoiler: 1kHz Spectra

1mW @ 16 Ohms
View attachment 12981
1mW @32 Ohms

1mW @ 300 Ohms

100mW @ 16 Ohms

100mW @ 32 Ohms

100mW @ 300 Ohms

Spoiler: 10kHz Spectra

100mW @ 16 Ohms

100mW @ 32 Ohms

100mW @ 300 Ohms

Spoiler: Frequency Response

16 Ohms

32 Ohms

300 Ohms

Spoiler: IMD DFD @ 100mW

32 Ohms

300 Ohms

Spoiler: THD vs Output

16 Ohms

32 Ohms

300 Ohms

Output Impedance vs Frequency

 

[DonH56]

Click on the spoilers -- last plot is Zout (~0.05 ohms at LF rising to ~0.5 ohms at 20 kHz -- pretty low).

 

[The Jniac]

Is there an output impedance measurement? Perhaps I'm missing it.

It is in the Unbalanced Output spoiler.

 

[Dialectic]

Click on the spoilers -- last plot is Zout (~0.05 ohms at LF rising to ~0.5 ohms at 20 kHz -- pretty low).

Oops, my bad.

Pretty low, yes, but not as low as I'd hoped.

 

[ThatFreakyLittleMan]

The initial Balanced FR graphs for 16 ohms and 32 ohms are the same; THX accidentally copied the 32 ohm graph and indicated the file as 16 ohms.
https://www.massdrop.com/buy/massdr...k/2096115?utm_source=linkshare&referer=4WDXBV

The corrected Balanced FR 16 ohms graph:

Spoiler

 

[The Jniac]

The initial Balanced FR graphs for 16 ohms and 32 ohms are the same; THX accidentally copied the 32 ohm graph and indicated the file as 16 ohms.
https://www.massdrop.com/buy/massdr...k/2096115?utm_source=linkshare&referer=4WDXBV

The corrected Balanced FR 16 ohms graph:

Well that ruins everything. How am I supposed to enjoy my music when the amp has lost 1.5dB at 80kHz?

 

[ThatFreakyLittleMan]

I understand. It's a travesty, and an omen of things to come as the four horsemen will soon descend upon our world to herald its end. Bedlam will envelop the planet, and the once-secluded cosmic entities of the universe will swarm like maggots unto the decaying carcass that was once called Earth.

But for real, as someone that got in on the drop in March, your pressing for more measurements and posting the released graphs on r/headphones is greatly appreciated.

 

[The Jniac]

I am glad to be of service.

 

[yummy]

I am glad to be of service.

don't know what happen with you, you remove the whole "spolier" section, we no talking movie here, just plain post, no tricking like this click and click fun wasting us time, sir.

 

[yummy]

for those who no wanna click a zillion times

ubal

bal in next post

 

[yummy]

be warn: only THD no THD+n

 

[mi-fu]

the drop is back again:
https://www.massdrop.com/buy/massdrop-x-thx-aaa-789-linear-amplifier/

 

[amirm]

the drop is back again:
https://www.massdrop.com/buy/massdrop-x-thx-aaa-789-linear-amplifier/

Nice but yet another insane ship date:

How are they making the first batch if they can't make a second batch until next year???

 

[FunctionalDoc]

I am glad I bought one the these in the first round. I have heard this amp design at the THX booth last year at RMAF and was blow away how clean and powerful and cool running it was.

 

[mi-fu]

Argh! I didn't notice the ship date is Feb 2019!!!!

I was hoping that there will be some real-life measurements of the first batch before making any decision.

 

[amirm]

FYI Benchmark has kindly offered to loan me one of their THX units. I am trying to work through my backlog before asking them to ship it.

 

[mi-fu]

That's great. Looking forward to it

 

[amirm]

When is the first batch of these supposed to ship?

 

[FunctionalDoc]

They ship the end of October for the first batch.