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Matrix M-Stage amp review: simple, cheap, and excellent. - Page 254

post #3796 of 4882
Quote:
Originally Posted by Chris J View Post


looks like we're both confused.....I doubt you would have trouble with the OPA627.

OPA627 is the Op Amp to use. You are correct!

It's stable at 0 dB gain.

Not too sure why Tam sells the OPA637 though.....

Yes we were..u talked bout 637 and i bout the 627..friends again?beerchug.gif

 

I will tell u a secret..i actually wanted to upgrade from opa627 to 637...and as always i did   my homework..and read bout the high gains needed..so i contacted them again..funny thing is that they replied  me that the 637 was not an upgrade soundwise.eventhough its more expensive...and they advised me to get the quattro..i can remember that i found that weird..they didnt even reply on my gain question of the 637.. And so i didnt bother and kept the 627..

 

So maybe ur right..i dont know myself...as.i only have experience with the opa627..and i dont talk bout products i dont know personally.. Was best investment i did for the little friend of mine to be honest


Edited by hifimanrookie - 3/14/13 at 8:08pm
post #3797 of 4882
Quote:
Originally Posted by hifimanrookie View Post

Yes we were..u talked bout 637 and i bout the 627..friends again?beerchug.gif

I will tell u a secret..i actually wanted to upgrade from opa627 to 637...and as always i did   my homework..and read bout the high gains needed..so i contacted them again..funny thing is that they replied  me that the 637 was not an upgrade soundwise.eventhough its more expensive...and they advised me to get the quattro..i can remember that i found that weird..they didnt even reply on my gain question of the 637.. And so i didnt bother and kept the 627..

So maybe ur right..i dont know myself...as.i only have experience with the opa627..and i dont talk bout products i dont know personally.. Was best investment i did for the little friend of mine to be honest

Sorry about that.
I guess I can't read! LOL

Strange how they answered your OPA637 questions.
Glad your friend likes the M Stage......!

No more of my bickering! biggrin.gif
post #3798 of 4882
Quote:
Originally Posted by imackler View Post

So. I don't have any experience with this stuff. Basically, you'd recommend I should take out the OPA637AP and put back in the original (
OPA134PA)
? If it helps, I'm only using it with the HD600/HD650 and on high gain so maybe it will be stable enough...


If I should, any recommendations where I get a little hex screwdriver...and do I need any other special tools? 

I would stick with the OPA2134.
Even though your amp is set to high gain and the OPA637 is OK for high gain, one of these days you'll forget and try another gain setting! mad.gif

When I get some time I'll try to find the Op Amp rolling instructions, or someone else may know where they are? I think someone posted something on YouTube.
post #3799 of 4882
Quote:
Originally Posted by Chris J View Post


I would stick with the OPA2134.
Even though your amp is set to high gain and the OPA637 is OK for high gain, one of these days you'll forget and try another gain setting! mad.gif

When I get some time I'll try to find the Op Amp rolling instructions, or someone else may know where they are? I think someone posted something on YouTube.

Or try the opa627..safe and sound.wink.gif

post #3800 of 4882

I'll hopefully receive mine today. My body is ready.

post #3801 of 4882
Quote:
Originally Posted by Chris J View Post



OPA627 is the Op Amp to use. You are correct!

It's stable at 0 dB gain.

Chris, is the opa627 ok at all gain settings on the m-stage? I have mine set at 10db.

 

Just I've got one of those opa627bias A mods coming in the post :)

post #3802 of 4882
Quote:
Originally Posted by LugBug1 View Post

Chris, is the opa627 ok at all gain settings on the m-stage? I have mine set at 10db.

 

Just I've got one of those opa627bias A mods coming in the post :)

Dont u worry..opa627 class a mod works flawlessly..i used it for 2 years with gain on zero for my he300 i had..and until now after 3 years still not one fault.


Edited by hifimanrookie - 3/15/13 at 2:12pm
post #3803 of 4882
Quote:
Originally Posted by hifimanrookie View Post

Dont u worry..opa627 class a mod works flawlessly..i used it for 2 years with gain on zero for my he300 i had..and until now after 3 years still not one fault.

Good stuff thanks :)

post #3804 of 4882
Quote:
Originally Posted by hifimanrookie View Post

Dont u worry..opa627 class a mod works flawlessly..i used it for 2 years with gain on zero for my he300 i had..and until now after 3 years still not one fault.

I agree, the OPA627 is fine for 0dB gain.

Personally, I leave the gain at 10 dB but I use Q701s.
post #3805 of 4882
Quote:
Originally Posted by Chris J View Post


I agree, the OPA627 is fine for 0dB gain.

Personally, I leave the gain at 10 dB but I use Q701s.

Yep i agree also..for my he300 i used 0db gain

for my he400 and 500 i used 10db gain

 

never used higher then that..never needed that.

post #3806 of 4882

So, I put the OPA2134 back in. Now, if I want to do the Class A mod in a safe way, even for low gain, what opamp do you guys recommed? the OPA627? Should I buy one from Tam Audio w/ class A biasing mod already done or is there another site you recommend? I'm totally open to recommendations... Thanks all! 

 

(Feel free to comment, but I just read 50 pages: hifimanrookie will probably recommend the Class A OPA627 Mod and Chris J will probably recommend the LM4562NA. Thanks, guys!)


Edited by imackler - 3/18/13 at 3:15am
post #3807 of 4882
Quote:
Originally Posted by imackler View Post

So, I put the OPA2134 back in. Now, if I want to do the Class A mod in a safe way, even for low gain, what opamp do you guys recommed? the OPA627? Should I buy one from Tam Audio w/ class A biasing mod already done or is there another site you recommend? I'm totally open to recommendations... Thanks all! 

(Feel free to comment, but I just read 50 pages: hifimanrookie will probably recommend the Class A OPA627 Mod and Chris J will probably recommend the LM4562NA. Thanks, guys!)

I recommend the............never mind, you've already read my posts! tongue.gif

Seriously, the change in sound between various Op Amps is actually very, very subtle.
post #3808 of 4882
Quote:
Originally Posted by Chris J View Post


I recommend the............never mind, you've already read my posts! tongue.gif

Seriously, the change in sound between various Op Amps is actually very, very subtle.

And my posts too wink.gif

And i agree..diff in sq is subtle..but in my eyes worth it..biggrin.gif

post #3809 of 4882

I have a quick question about the M-Stage that I'm possibly a bit concerned with.  I've had one now for a few months and it seems to work fine with my AKG Q701 and Grado SR80s.  But if I plug in my HD25-1 II, I can hear a constant 'hum' as soon as I plug them in.

 

The hum is the exact same level regardless of gain or volume or opamp.  I use the M-Stage with my Q701's 90% of the time and didn't notice it until I just switched over to the HD25-1 II.  When I first received the amp, I tested it with all my headphones and I don't recall hearing it at that time.  However, it may have been there and I just didn't notice it.  If I could only go back and check again :)

 

Now since my SR80 and Q701 are both open while the HD25-1 are closed, I'm wondering if I'm just noticing it because they are more sensitive and isolating.

 

Reading the forums, some have mentioned a similar issue relating to ground loops.  But those seem to change with the gain and volume on the pot, while mine doesn't.  I've loosened and tightened the screw on the bottom of the unit just in case but didn't help.  I opened it up and took a look and everything seems fine as far as I can tell.  I have the OPA627 Class A opamp in there, so I swapped it back to the stock opamp but no change.

 

Can anyone with a similar headphone or possibly an iem comment on this?  Is everything fine and the M-Stage just has a slight power hum to it that I'm only picking up on sensitive phones?  Or should I be concerned?  This is my first real desktop amp (former amp is a PA2V2) so I'm not sure if this is ordinary behaviour.  I seem to recall in a comparison thread between the M-Stage and the O2, that the M-Stage had a bit of noise while the O2 was entirely 'black'.

 

I like the sound of the M-Stage but want to make sure my unit isn't defective either.


Thanks

post #3810 of 4882

If some of you could save me 225 pages of reading... how is the M-stage with Senn HD 600's?

 

Specifically, how is the USB Matrix M-stage v 2.1 with OPA627AP Class A Biasing Mod with the HD 600's?

I'm currently powering my HD 600's with a FiiO E9/E10 stack, and am wondering if the M-stage (with USB and mod above) will provide a significant upgrade? Thoughts?

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