XLR In & Out EQ/Reverb with Phantom Power

Posted by M. Spencer on Mar 25, 2016; 7:08pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/XLR-In-Out-EQ-Reverb-with-Phantom-Power-tp29256.html


My sax player buddy asked me to build him a box that would be useful for small gigs. In it he wants:

* 2 XLR ins
* 4 band EQ
* Reverb
* 1 XLR out
* Phantom Power

He wants two xlr ins in case he has two mics set up for different instruments (he doubles on trumpet), or he needs a background vocal. At least one of those XLR ins has to provide phantom power for his clip-on condenser mic. This box is basically for rooms with little more than a lunchbox PA and no audio engineer; to give sax man some control over his sound from the stage.  

I was thinking using the 2 Channel Mixer, series into the 4 Band EQ , series into the Box of Hall, then to a DI with XLR out.

My questions:
- How would I implement two XLR ins? So far I haven’t built anything much more complicated than compressors and reverb/delay with standard 1/4” jacks.
I’d rather not make the XLR ins “unbalanced” by shorting the 3rd pin - prefer to keep the XLRs shielded and balanced to shunt radio interference, etc.  

- Are there any recommended DIY phantom power box builds that supply their own +48v?

- How do I deal with the phantom power? As far as I understand I need it to power the active DI at the end, and the condenser mic at the front of the chain. Would I be able to power both the EQ/Reverb sections of the circuit and the Phantom Power from a 9v power jack?

- Are there any other issues I should be concerned with (matching impedance, etc)

Is this all feasible? I know this is a big ask and a complicated box, I appreciate your input.