Mini dsp 2x4 output buffer

Beau

Member
2003-07-17 3:29 am
I have a Minidsp 2x4 (V1.5) that I want to use in my system.

Configuration is

Source

Preamp/source selection Vol control

PGA2311 LCD Volume Remote Control Gold RCA Jeff Rowland | eBay

Minidsp

Ucd400 amplifiers

Problem is the input signal to the amp is too low. I need at least 2v input, my minidsp only outputs .9v and its just too quiet.

I was thinking of putting in a line driver after the minidsp, like this,

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Anyone have any suggestions?
 

paulb

Member
2001-06-01 4:53 pm
Calgary
Last edited:
I would try the second board. It looks like 1k resistors in a standard configuration, so it should yield a 6db increase in output level on your UcD amp just from the unbal/bal conversion. Even if it doesn't, it's much easier to work on (with larger components) so you could modify it if necessary.

Cheers,

Dave.
 
I assumed the jumper was already in the 0.9v position. Maybe not?

The miniDSP is nearly unity gain when in this configuration, so you shouldn't notice a volume difference whether it's in the circuit or out.....depending upon how you program it.

It also depends upon the power amp used and it's voltage gain and required voltage input for rated power.

Cheers,

Dave.
 
The miniDSP 2x4 balanced version would be perfect for that application. I assume you purchased your 2x4 miniDSP before the balanced output version was available?

Anyways, the unbalanced/balanced converter should do the job and increase your effective power amplifier gain to 32db. If you need more voltage you can always change a couple of resistors to increase it.

Cheers,

Dave.
 

Beau

Member
2003-07-17 3:29 am
No, second hand so no choice and no idea at the time.
I think I may have stumbled on an answer, change formst to
Input-minidsp-pga2311 pre/volume-ucd400

I think the vol control puts out 2v, no response from the manufacturer
Is there an easy way to test?