THAT1510 Mic pre to summer to THAT1646 question

[pj]

Hi All,

This is a bit of a continuation of the THAT1510 mic pre problems thread, but seeing the interference problems are solved, I thought I should really start a new topic.

I have a quick( and possibly daft?) question on implementing the THAT1646's. I've got the AN242 based mic pre which has a dc servoed buffer which I want to run into a summing amp/mixer so i can assign the mic(s) to both L & R channels. The 2 mic channels will be only inputs to the mixer, so there shouldn't be any unexpected dc on the mixer buses. I'm going to use 10K log pots after the summing amps as master faders.

The other change I'm planning on making is reconfiguring the mic pre buffer to unity gain, as the THAT1646 adds 6dB gain.

Is there any reason to servo or block DC after the summing amp/master fader and before the 1646's? Or any need to buffer the output of the master fader?

cheers
Paul

 

[pj]

Hi Roger,

Thanks for the advice on buffering the 1646. For 1640 did you mean the 1606 (balanced input vers. of the 1646) which also has +6dB gain?

I've got a stack of OP275 I was planning to use, but is this suitable for a unity gain buffer?

cheers
Paul