bass boost

[odysseybmx414]

i was wondering what is the simplest way to build a simple bass boost circuit using a small op amp? maybe u could post me a schematic? thanx

 

[guzzler]

You could use a simple shelving filter, as used in the PPA.

http://elvencraft.com/ppa

C7, R7, S1. It's very simple and I really like the sound

 

[odysseybmx414]

but how would i connect that into a normal non-inverting amplifier like the one in the national datasheets

 

[cellofan]

One way to do it
http://www.linkwitzlab.com/filters.htm#9