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Mini3 Gain

post #1 of 7
10/8/10 at 12:50pm
Thread Starter 

I'm looking at building a Mini3 amp in the near future, and would like some guidance on what gain level to select.

My player is a Philips.  I currently have a pair of Alessandro MS-1, and will have a Head-Direct RE0 very soon.  Both 'phones are low impedence, so I'm thinking a gain of 4 or 5.

 

Thanks,

Brad

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post #2 of 7
10/8/10 at 1:14pm

Unless you have a particularly low output source gain of 2 is the way to go. 

MAYBE 3, but 2>3 in this case.

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post #3 of 7
10/8/10 at 2:13pm

I agree with Nikongod.

Most sources are pretty loud already, gain of two

is plenty in most cases and keeps the noise floor low.

I would only go with a gain of five for op amp rolling

and in a mini^3 that is impractical.

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post #4 of 7
10/8/10 at 3:32pm

With a 2Vrms source and 2x gain (and 32 ohms/100 dB/mW headphones), I can't go over 8:00 without feeling uncomfortable, and this is with a 50k ohm RK27 volume pot.

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post #5 of 7
10/12/10 at 10:58am
Thread Starter 

I forgot to mention that the Mini3 would occasionally be used with my TT setup.  The cart is a Denon DL-110 HOMC, and the preamp is a VSPS set at 40 dB gain.

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post #6 of 7
10/12/10 at 11:06am

I'd agree on the low gain.  In my Carrie (Mini^3 + grubDAC), I did a gain of 2 and have no issues on my high impedance phones, so on low impedance phones you should be good.

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post #7 of 7
10/12/10 at 12:02pm

Don't overspec gain, it's not free.

 

Through-hole resistors are also kinda easy to desolder if you need to up the gain later.


Edited by gimble - 10/12/10 at 12:04pm
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