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M3 gain recommendations - Page 2

post #16 of 22
10/12/09 at 5:51pm
Thread Starter 
So the extra wire in the feedback loop would not pose much issue then?
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post #17 of 22
10/12/09 at 5:56pm
My own M³ has a gain of 5 and it works well with a wide variety of headphones. My own reference headphones are still HD600s, and at meets, people plug in all sorts of headphones and I have yet to hear anyone complain about too much or too little gain. OK, maybe it's a bit much for IEMs and not enough for K1000 or certain 600 ohm headphones, etc., but I think in general people obsess too much about the gain issue.
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post #18 of 22
10/12/09 at 5:59pm
Quote:
Originally Posted by m1abrams View Post
So the extra wire in the feedback loop would not pose much issue then?
If you implement this, keep the wiring as short as you can. I also recommend the parallel resistor to be placed on R3 because it tends to be the one with lower value, so wire inductance plays less into the overall effect. It also causes the least amount of change to the bass boost curve.
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post #19 of 22
10/12/09 at 6:00pm
Thread Starter 
Quote:
Originally Posted by amb View Post
My own M³ has a gain of 5 and it works well with a wide variety of headphones. My own reference headphones are still HD600s, and at meets, people plug in all sorts of headphones and I have yet to hear anyone complain about too much or too little gain. OK, maybe it's a bit much for IEMs and not enough for K1000 or certain 600 ohm headphones, etc., but I think in general people obsess too much about the gain issue.
Well then I think I will make things simple and go with a fixed gain of 5. Thanks for the input.
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post #20 of 22
10/12/09 at 8:26pm
Quote:
Originally Posted by n_maher View Post
I think what he's saying is that with a pot that has excellent channel matching at even the lowest levels that you could be ok with an extremely high level of gain. I'd argue that 11 is more than enough for just about anything unless you have a low-output source or the K340s/K1000s. Me, I'd go with 2/8 if I was going to implement a switch.
really, you think? I would think a gain of 20 would be absurdly finicky to control.
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post #21 of 22
10/12/09 at 8:35pm
I have an M3 with a gain of 11. Use it with HD650's and used to have SR 225's. It works fine with both, probably could lower for both phones but it sounds fine. I'm sure 5 would be fine.
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post #22 of 22
10/28/09 at 10:40pm
Thread Starter 
Well I just finished my board stuffing and initial tests. Another M3 is born

Sounds great, using pretty much standard BOM with bass boost option, gain 5x, OPA627AP opamps and a sigma11 PS set to 24V.

Now I just need to figure what I am going to do to case it. Probably go with a single case since the Plitron I have seems to be pretty quiet while it sits right next to the input of the M3 board and listen to it with a pair of Grados.
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