Does the twetter unscrew in a pr 15 400 watt speaker

Yes, can be repaired. Sounds like sound output power chip has gone bad.

I assume you mean the Pr-12RX passive? That seems wrong to me, too. Put an ohm meter across the terminals of the horn driver and the woofer seperatly to see which, if either, is blown. If they're OK, look for a bad solder joint on the crossover.

That depends on where you live and if you want to replace them yourself. If you do then you need to make sure they match what you have, (impedance, wattage etc)

The Speakers can be replaced with any brand. The thing you need to know is the OHM rating for the speaker. OHM is also called impedance. Unless the sticker has fallen off the back of the speaker that information will be on that sticker. OHM rating MUST match the old speaker. For instance 4 OHM, 8 OHM, 16 OHM are common ratings. All different ratings but VERY important to get this correct otherwise you could damage the electronics of your instrument.

it will be wise to replace the speakers.

It sounds like the rubber around the speakers has perished. Open the cabinet to check. If so, measure the size and order replacements easily on internet. It's a simple job for someone with a little knowhow

Disconnect from the mains.
Unscrew the four screws in the top
Slide out the chassis
Remove the knobs
Unscrew the pot nuts
Unclip/unscrew the PCB
Unsolder the pot
Solder in new one.
Re-assemble in reverse order
Strongly suggest you youse a better quality pot
Also the treble pot tends to go on these, replace at same time
All the best, Chris

YOU MUST DIVIDE I= P/E I= AMP = P= WATTS E= TENSION
AND YOU WILL GET THE AMPS.

SINCERELY. God bless you

There is a speaker protection circuit that uses a lamp that will light IF you are driving the spoeakler TOO HARD !!! You can search for "Peavey speaker protection" circuiot online.

you do not need to dismantel . first remove the front grill which is held in place by screws which you are able to see. you need to get a special screwdriver for this, looks like a star screwdriver but i think it has about 6 slots. then only will you will be able to remove the speakers. if you are only removing the diaphragm , all you got to do is remove both handles and unscrew the the driver . then remove the diaphragm from the driver and replace with the new one