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Matrix M-Stage amp review: simple, cheap, and excellent.
Jan 20, 2013 at 4:40 AM Post #3,526 of 5,176
Quote:
jc89 said:
about the unbalance... it's completely due to my noobiness and carelessness...
 
I didn't realize that the two sets of gain controls are controlling left and right channels separately... I thought they are for input 1 and input 2 separately.
 
I'm confused by this design though... Why would anyone want to have different volumes coming out from left and right sides?
Are there any technical reason for this design? 
 
 
Thanks!
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Quote:
hifimanrookie said:
I dont know also...maybe just a joke of the designer?..but check my amp..its even worse!..i even have two volume knobs, two on-off switches and even two power cables..lolz..
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Quote:
chris j said:
 
Nobody wants two different volumes from left and right! 
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They would have to use a more expensive switch than the little switches you see on the bottom of the M Stage.
So you could say it keeps the costs down.
Most people set gain to 10 dB with Q701 and leave it there.....forever.
 
I just compared 5 different phone pre-amps, they all have that funny feature: separate switches for left and right.
It's even worse, because you can adjust:
input resistance
input capacitance
pre-amp gain
subsonice filter
but all switches are separate for left and right! 
But once you set the switches the way you want them, you never change them unless you change to another phono cartridge.
 
Seems to be  mark of passage for M Stage owners, they all need to mix up gain settings.
 
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As far as headphones go, it's mostly for people with differing levels of hearing between their ears.  For example, I'd say I have maybe 85% hearing with my left ear compared to my right.  All I have to do is adjust the balance a bit towards the left speaker and voila my hearing is magically fixed 
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Jan 20, 2013 at 4:47 AM Post #3,527 of 5,176
wild said:
As far as headphones go, it's mostly for people with differing levels of hearing between their ears.  For example, I'd say I have maybe 85% hearing with my left ear compared to my right.  All I have to do is adjust the balance a bit towards the left speaker and voila my hearing is magically fixed 
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And in my case the two volume knobs are to correct possible inbalance of the tubes also
 
Jan 20, 2013 at 11:00 AM Post #3,528 of 5,176
Quote:
hifimanrookie said:
To do or not..the opa627 sounds almost the same as opa637..and yes..the opa637 CAN oscillate on lower gains..its wellknown..it gets stabile on 18db and forth... So in my opinion the opa627 is a good update choice
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At 18 or 20 dB of gain they should sound identical.
The difference between the two is academic when used for audio.
So why use the OPA637?
Be safe, use the OPA627.
Quote:
bracko said:
 
I don't know though if the amp gets hotter with LM4562.
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The amp won't get any hotter if you use the LM4562, or stock Op Amp, or OPA627, or Class A mod OPA627.
 
The amp will probably get hotter if you have an oscillating OPA637! 
 
Jan 20, 2013 at 2:59 PM Post #3,529 of 5,176
Quote:
chris j said:
Under certain conditions (Gain set to 0 or 10 dB) the Op Amp will probably oscillate.
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I find the oscillating gives a neat surround sound effect to the soundstage.
 
Jan 20, 2013 at 3:03 PM Post #3,531 of 5,176
Jan 20, 2013 at 7:35 PM Post #3,533 of 5,176
Something's wrong with my mstage.  I was sitting here and I started to smell something burning and started to sniff around.  No smoke coming out but an obvious burning smell coming out of my amp. I opened it up and the burnt smell is stronger but I dont' know which part of the board.  Everything looks fine to me.
 
Jan 20, 2013 at 10:09 PM Post #3,534 of 5,176
Jan 20, 2013 at 10:10 PM Post #3,535 of 5,176
Quote:
burrrcub said:
Something's wrong with my mstage.  I was sitting here and I started to smell something burning and started to sniff around.  No smoke coming out but an obvious burning smell coming out of my amp. I opened it up and the burnt smell is stronger but I dont' know which part of the board.  Everything looks fine to me.
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never a good thing, is it still under warranty?
 
what happened before the burning smell?
 
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