Full Range EQ

[Eric]

Did some measurements today and discovered one of those amazing and rare times when theory matches practice: my measurements exactly fit the Micro-Cap sim! Awesome sauce!

 

[Zen Mod]

Papa's
Kung
is
Funniest
Fu

 

[kp93300]

Hello,
What is the V+ of this circuit ?
2N 3819 is a reasonable substitute for J 113?
thank you

 

[Eric]

Power supply is 24v. RCRC reduces it just a bit. I don't have any input on reasonable substitutions, but the necessary transistors come with the board.

I opted to finish mine "breadboard" style. I added little rubber feet and it will sit behind my preamp.

 

[Eric]

After a few days of listening, these little wonder boards are awesome! I've been using my TangBand 1772 speakers in a 40L vented enclosure for several years. I've been fiddling with an external speaker-level crossover on and off during this time and have made some improvements to the rising top end and the enormous hump from 7-10k, but it never sounded quite right to me. With Nelson's EQ board, I was able to dial things in with much more precision, add a little bass, and now I have a flatter response plot without the nasty 7-10k hump.

This had definitely increased my enjoyment of these speakers! Thank you, Nelson!