how exchange this for more power?

[tadiam]

I want use the same voltage.
20w no more......... put drivers?

http://www.users.otenet.gr/~athsam/p...er_12w_fet.htm

[cotdt]

use the amps in balanced mode for 4x the power.

[h_a]

Does not look like a very sophisticated design to me. I don't remember if I've ever seen zeners as frontent voltage regulators. A fet for a source follower was maybe to expensive

Any way, build it if you like it.

Have fun, Hannes

[tadiam]

i build one similar but bipolars in the output.
20w rms and regulatorsin ci and drivers sound good and cheap