no direct sub... but the LM359 is a possible sub. Its a dual Norton amp that may be better than the LM3900 by far. Please try it and let us know :^P Bob Pease hates the LM3900... (he says its not even an opamp) but has no experience with the LM359 H^) harry William Berzinskas wrote: > looking for a sub for lm3900.. can i just use a standard opamp for > this?