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Monoprice Monolith THX 887 Balance Headphone Amp: New Champ?

leafhonor

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Have some interest on the 887. I already have a dx7s so can I use it as a dac and connect to the 887? Will it souds better?
 

NemoReborn

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Have some interest on the 887. I already have a dx7s so can I use it as a dac and connect to the 887? Will it souds better?

well , will it sound better ....? first what are the headpone ? this is the most important , if the amp of the dx7s have enought power for the headphone u use , than it might sound just a little better cleaner etc ... but if they are under powered by the dx7s's amp , well ull see a bit difference using the 887 ...
 

leafhonor

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well , will it sound better ....? first what are the headpone ? this is the most important , if the amp of the dx7s have enought power for the headphone u use , than it might sound just a little better cleaner etc ... but if they are under powered by the dx7s's amp , well ull see a bit difference using the 887 ...
Thanks! My headphones are hd650, sony z7m2, and grado rs2e. I also have se846. What I worry about is that dx7s amp’s output independence is too high(about 20) so it sounds weird when I connect to rs2e and se846.
 

Celty

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Any news on a manual being available yet?
 

richpjr

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Any news on a manual being available yet?

Astonishing that they can ship a product with no manual or at least an online manual. I asked when it would be available as a question on their website and it was deleted - lol.
 

Pillars

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Here's actual pictures of the internals. This is the EXACT layout as the THX 789 with the exception of using OPamp 1612A instead of 1602A. The power supply is even the exact same and from the same manufacturer.

*edit* from what I could see, clarified below additional upgrades were done by manufacturer.

IMG_20191119_143147.jpgIMG_20191119_143139.jpgIMG_20191119_143154.jpgIMG_20191119_143421.jpg
 
Last edited:

Celty

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lambdastorm

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MonolithGuy

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Just an FYI, for the 887 we upgraded over 50 internal components to increase performance:

5 Opamps – same opamps as 888 to reduce noise

32 Resistors – Upgraded to reduce noise

12 Capacitors – Upgraded to reduce distortion

I'm glad to see there is interest in the unit!
 

Pillars

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Just an FYI, for the 887 we upgraded over 50 internal components to increase performance:

5 Opamps – same opamps as 888 to reduce noise

32 Resistors – Upgraded to reduce noise

12 Capacitors – Upgraded to reduce distortion

I'm glad to see there is interest in the unit!

Thanks for clearing that up, though, we're talking 2db difference here in performance. An exceptional design made even better.
 

ArtemisXCIX

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Just an FYI, for the 887 we upgraded over 50 internal components to increase performance:

5 Opamps – same opamps as 888 to reduce noise

32 Resistors – Upgraded to reduce noise

12 Capacitors – Upgraded to reduce distortion

I'm glad to see there is interest in the unit!

Hope to see the new DACs coming out perform well too. Pretty interested in those especially the Liquid Platinum with AKM4499.
 

idkwho

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Well, I don't have any measuring equipment or expertise, but I can take a stab at a subjective report. I was surprised to find the SU-8 arrived today, so contrary to expectations and tracking information, I have it before the 887!

I do have a planned use for my STX, I have my "gaming" headset - a SteelSeries Arctic Pro with "GameDAC". Though the GameDAC has some nifty features, I was not really impressed with the sound. So I tried the headphones plugged into the STX and wow. It truly was an immediate and dramatic difference.

So the Arctic Pro and the built in microphone will be partnered with the STX when I need the microphone for whatever application or game. BTW, the Arctic Pro on my big head would be very uncomfortable on my ears, so I replaced the stock pads with a set from Wicked Cushions, and it made it far better.

One thing I found with the headphone output of the STX was that there was an audible noise floor when I plugged in my headphones (20 Ohm impedance) however when using the RCA output to the THX 887 it was much cleaner with no hiss/noise. I think the output of the STX may be comparable to the SU-8 (V2) in terms of quality. By the way do you have the SU-8 V2 or V1? I assume the V2.

Let me know your impressions of the SU-8 compared to the STX (both plugged into the THX 887) though Balanced output from the SU-8 will be louder than the RCA of the STX so take that into account.
 

Celty

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One thing I found with the headphone output of the STX was that there was an audible noise floor when I plugged in my headphones (20 Ohm impedance) however when using the RCA output to the THX 887 it was much cleaner with no hiss/noise. I think the output of the STX may be comparable to the SU-8 (V2) in terms of quality. By the way do you have the SU-8 V2 or V1? I assume the V2.

Let me know your impressions of the SU-8 compared to the STX (both plugged into the THX 887) though Balanced output from the SU-8 will be louder than the RCA of the STX so take that into account.

Yes it is a SU-8 (V2). I do plan on hooking up the RCA's to the STX, as well of course through USB to the SU-8. It appears I may not get my XLR headphone cables until next week! So initial listening will be single ended on both headphones.
 

Celty

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Just an FYI, for the 887 we upgraded over 50 internal components to increase performance:

5 Opamps – same opamps as 888 to reduce noise

32 Resistors – Upgraded to reduce noise

12 Capacitors – Upgraded to reduce distortion

I'm glad to see there is interest in the unit!
Glad to see you are posting here. Please share any information you can, I should have my 887 arriving Thursday. Amirm mentioned in the review:
"The unit I received for testing is the limited production run. I am told it is representative of the retail products as manufacturing ramps up." Do you know if there were any changes made since the limited production run and the most recent run?
 

lambdastorm

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Just an FYI, for the 887 we upgraded over 50 internal components to increase performance:

5 Opamps – same opamps as 888 to reduce noise

32 Resistors – Upgraded to reduce noise

12 Capacitors – Upgraded to reduce distortion

I'm glad to see there is interest in the unit!
I'm really curious about capacitors making a difference in measurement. The only capacitors I know that have excellent measurements are Nichicon's audio line, most of which measure completely flat from 20-20k. Seeing that you guys didn't use Nichicon, is the capacitor type low ESR?
 

Pillars

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Glad to see you are posting here. Please share any information you can, I should have my 887 arriving Thursday. Amirm mentioned in the review:
"The unit I received for testing is the limited production run. I am told it is representative of the retail products as manufacturing ramps up." Do you know if there were any changes made since the limited production run and the most recent run?
I know they ditched the sweet 887 sticker, I'm sour on that one :(
 
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