Peavey Classic 30 extension speaker?

Gerard Rowan · Post by **Gerard Rowan** » 27 Apr 2002 12:36 am

I have a home-made cabinet with a 15", 8 ohm Fender speaker. I've tried using this as an extension speaker for my Classic 30 but it's very quiet compared to the built-in speaker (16 ohms). I believe the amp can run 8 or 16 ohm speakers. Do I need to modify the amp somehow to get this to work properly?

Jim Smith · Post by **Jim Smith** » 27 Apr 2002 5:12 am

Extension speakers should ideally be the same type and impedance as those in your amp, so you should use a 16 ohm extension speaker.

Also, an extension speaker is wired in parallel, which makes the total impedance less than the lowest impedance of the one with the least impedance.

In your case, with an 8 and a 16, your total impedance is somewhere around 6 ohms. Two 16's in parallel give you 8 ohms, which according to you, is the minimum impedance for your amp.

Mike Brown · Post by **Mike Brown** » 30 Apr 2002 11:26 am

The Classic 30 is designed to operate with a minimum 8 ohm speaker load. With an 8 and a 16 ohm speaker connected, the load is 5.34 ohms and the 8 ohm speaker. The ideal load on the amp is either 16ohm(internal) or a 16 ohm(external) speaker and a 16 ohm(internal) speaker for full power.