Help with speaker cabs

Simo98 · #1 05-21-2010, 01:57 AM

Hey guys,

I've had a large combo amp (Peavey MKIII) for a while, but the speaker is a 15" and its buggered, as a 15" is rather expensive to replace a bought a 2x10 cab off ebay recently for a bargain, its cut down from an older Peavey cab with 2x10 1x15 or 18 (not sure).

Now it says 4 ohms on the back, but since its being cut down and re-wired I guess that has changed. I got the multi meter onto it and it reads 6.5 ohms resistance, is this the same as the impedance (or close enough?).

The back of the Mk III has 2 outputs that read '130 watts, 4 Ohms'.

Now im under the impression that more ohms isn't going to blow up a ss amp, just limit the wattage you can get out of it?

Is it safe to hook this baby up? It should be fine and just give me a lower wattage that id get with 4 ohms if im not mistaken.

If im doing something drastically wrong, please let me know before I fry myself, as im keep to see what sort of volume I can push with it

**Rune Bivrin** · #2 05-21-2010, 02:57 AM

6.5Ω would be typical DC resistance for a nominal 8Ω speaker.

This won't harm the amp in any way.

Simo98 · #3 05-21-2010, 03:13 AM

Quote:

Originally Posted by Rune Bivrin

6.5Ω would be typical DC resistance for a nominal 8Ω speaker.

This won't harm the amp in any way.

Ah, cool.

So its likely 2 16 ohm 10" in parallel, which originally had an 8 ohm 15" also in parrallel (as that would give 4 ohms total impedence)?

So all it should do is cut my 130W output down to 65Ws, correct?

**Rune Bivrin** · #4 05-21-2010, 02:36 PM

Depends on the amp. Most amps don't really put out twice the power at 4Ω as at 8Ω, so the result will probably be a little more than 65 watts. Not that it will matter.

And yes, that's very likely two 16Ω drivers in parallel.

Simo98 · #5 05-21-2010, 04:38 PM

Cool, thanks

jtc_hunter · #6 05-21-2010, 06:15 PM

If your Peavey combo is still in one piece, you could just replace the 15" and have a great amp. Go to: http://www.avatarspeakers.com/ and click on "scratch and dent/overstock". Dave is selling 4 ohm Eminence Delta LF 15" speakers for $68 incl shipping. Sell that other stuff you had and stick with a great combo. The 15" Delta LF will be killer in that combo for $68, you cant go wrong.

Sundogue · #7 05-21-2010, 06:44 PM

Peavey only uses 4 or 8 ohm speakers. If it's an 8 ohm cab, they are two 4 ohm speakers wired in series.

**Rune Bivrin** · #8 05-22-2010, 02:52 AM

If the drivers that were put in are Peavey drivers. That we don't know. Not that it matters.