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Matrix Quattro amp: unboxing and initial impressions - Page 11

post #151 of 229
Quote:
Originally Posted by Loquah View Post

I assume so - the instructions weren't really clear. I used the pads where the screws mount the PCB to the chassis as my earth which seems to yield good, consistent readings.

I've since realised that I had AD843 op amps installed instead of the stock OPA604s though. New readings are much closer to 10mV, but still a little high and higher on one pair than the other (ranging from 11-12mV up to around 14mV on the higher pair).

I think it was in this thread that someone said Matrix says do not roll Op Amps.
I suppose we can see why they said that!

Sounds like they have got you to measure DC offset at the headphone outputs?
post #152 of 229
Quote:
Originally Posted by Chris J View Post

I think it was in this thread that someone said Matrix says do not roll Op Amps.
I suppose we can see why they said that!

Sounds like they have got you to measure DC offset at the headphone outputs?

Damn it!
The AD843 is an excellent Op Amp but it is not pin for pin interchangeable for the OPA604.
The offset trim is quite different.
post #153 of 229
Quote:
Originally Posted by Chris J View Post


Damn it!
The AD843 is an excellent Op Amp but it is not pin for pin interchangeable for the OPA604.
The offset trim is quite different.

 

Oh, crap!

 

Hope I haven't cooked anything else!!! I thought (naively perhaps) that all audio specific DIP-8 op amps would be interchangeable

post #154 of 229
Quote:
Originally Posted by Loquah View Post
 

 

Oh, crap!

 

Hope I haven't cooked anything else!!! I thought (naively perhaps) that all audio specific DIP-8 op amps would be interchangeable

 

A shame, the AD843 would be a nice alternative to try.

The amp is probably fine if you put the OPA604 Op Amps back in.

post #155 of 229
Everything seems fine (other than the lost smoke issue)
post #156 of 229

:beerchug:

post #157 of 229

I would like to ask 2 questions, please.I have Atlas Hyper 2.0 speaker cables, HK 6550 vintage amplifier, Technics SB-EH750 vintage 3-way speakers and Atlas Hyper Asymmetrical RCA interconnect.I currently have Arcam rPAC + Furutech ADL Formula 2 USB cable, and I quite hate it.It has soft, boomy, totally rolled-off bottom end, I would not call it bass anyway.I am looking for a worthy upgrade..I have tried the white Arcam RDAC with WOLFSON chip inside, and there was very little difference.

 

1.Do you think the Quattro would be a worthy upgrade then? I am after detail and clean bass.

 

2.Does any of you think Quattro`s bass sucks ?

post #158 of 229
The Quattro is a headphone amp, not a speaker amp, is that what you're after?
post #159 of 229

Damn...wrong thread, sory for this - I am after the Quatro DAC.

post #160 of 229
What makes you think the problem is the DAC?
You should not get boomy bass from an Arcam DAC.
Maybe the speakers?
post #161 of 229
+1
I'd be looking at the amp and speakers. Is the amp still 100% sound (ie caps intact, etc.)?
post #162 of 229

Yes, it was professionally restored.I have tried the DAC with many different speakers...Boston Acoustics A25 and A26, MA Bronze BX2, MS Aviano 2, Kef Q100, Quadral Argentum 330, PSB B5...I get the same blurred, non-detailed, totally uncontrolled bass with headphones, namely AKG K450 with a custom OCC cable, and also from V-Moda V80.I have tried a few USB and RCA cables as well.I get similar results from Arcam RDAC - rolled-off, unclear highs, and forwarded mids / vocals.Sorry, Arcam, this brand is blacklisted for me.The tech support e-mail from a very reputable UK online shop said that DAC is essential - if the source detail is not there, no speakers can " invent " it.I am sorry for asking in the wrong thread, I would not mind if my question will be moved, or if I have to start a new thread.


Edited by nimanchev - 4/1/14 at 8:46pm
post #163 of 229

Weird, I've always found Arcam equipment to sound slightly warm, but also transparent and crystal clear. Bass was very well controlled.

post #164 of 229
Hello everybody.
My setup is Matrix x-sabre + quattro + balanced connection using Kimber Kable Tonik XLR 0.5m and headphones ATH AD1000.

So quattro is terrific staright out the box. I never heard such a wide scene and details in mid and highs. My experience is with Dr.Dac2 Dx opa 627.

Im not sure that quattro added much bass to my ATH where bass is very flat. Though I still believe That ATH AD1000 a very detailed with the most widest scene to the price, so I can excuse them for the bass.

My IE8 and Bose qc15 demonstarted sufficient bass, but I saw limitations of this models in terms of possible scene and details which Sabre+Quattro can provide.

Back to quattro + Sabre. I Cant imagine I can have better sound (details, scene and dynamic) in this price range.

Can you recommend HeadPhones with details and scene of ATH AD1000 but with solid/right bass as well?

Is it worth to supply quattro with some premium power cord?

X-Sabre is powered with Oyaide Tunami and Oyaide premium connectors smily_headphones1.gif sic!
Edited by Gibalok - 4/16/14 at 1:24am
post #165 of 229

Just bought a CD here

 

http://www.hdtracks.com/top-50-best-sellers/audiogon-presents-the-wake-up-your-ears-sampler

 

for some 5$. Its a very good music in Hires, which will give you understanding what is your system can :)

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