Tweeters and horns need to be replaced and want

You will need to determine if it's the amplifiers or the tweeter themselves that are not working. If you open up the cabinets and check each tweeter with an ohm meter for continuity it will show if the tweeters are working, in which case the amp is the problem. if the meter shows that the tweeters are blown, you should still hook up another tweeter or speaker to the horn amp to see if it's blown and therefor took out the tweeters.
If any of this sounds complicated, you'd be best off taking the cabinets to the repair shop.

There are a number of versions of SP-3, but normally you would remove the screws holding the horn into the cabinet, take out the horn and then unscrew the driver from the horn. At that point, either replace the diaphragm on the driver or the whole driver.

Usually the colors you will find are red and black pair and yellow and white... USUALLY the red/blk pair go to the tweeter horn with red going to the + lead of the horn drivers. Usually the yellow/white pair go to the woofer with the white going to the + lead of the woofer in Peavey speakers... HOWEVER you never know if someone has rewired the cabinet so going by colors is NOT the best way to go... This should have the "soundgard" circuit in it and the lead that goes throught the lamp and resistor that is NOT connected to the inout jack is the TWEETER + lead. The pair that connects to the inout jack DIRECTELY is the woofer leads and the TIP connection of a 1/4 inch jack is the + woofer lead. Verifying these connections is the best method.

The typical cause of this is a blown tweeter or the tweeter has broken off of the horn and fallen inside the cabinet. Remove the screws from the horn and carefully remove the assembly. Try the speaker at low volumes to see if you hear any sound at all. Next, remove one of the wires and using a 9Volt battery quickly touch the 2 leads on the tweeter. If you don't hear a click, the tweeter needs to be replaced. Contact Mackie service for a replacement.

If you hear a click, then the problem is in the crossover or amp and further investigation willbe required.

Dan

This site says that's a tweeter...

http://www.speakerbits.com/products/speakers/horn-tweeter-diaphragms/list-170.aspx

The crossovers in professional speakers don't fail that easily. It could be a blown tweeter. To confirm remove the metal grille-- remove the screws of the Horn Tweeter -- remove the cable connectors on the tweeter terminals ( Red and Black wire ). Now if you have a multimeter put it in Ohms range and touch the probes on the tweeter terminals-- It should show a reading betwwen 4 to 8 Ohms depending what is written on the back of the tweeter magnet. If you do not have a Multimeter you can take an ordinary cell/battery ( 1.5v ) from a TV remote and touch the terminals of the Horn Tweeter with the battery. + to the tweeter + ( a small red dot or mark will be there on the tweeter ) and -- to the tweeter -- . When you touch the terminals or give 1.5 volt supply the tweeter will make a scratching noise.
If you do not hear the scratching noise - it indicates a blown tweeter coil and will need replacement.See link below for spares:-
http://legacysoundservice.com/catalog1/product_info.php?products_id=1417
But if it does, you are in trouble and will need professional help from a electronic technician.
Could be blown HF Amplifier, suspect the crossover last. They seldom fail.
Revert back for more help

Go to nearest Jamo Service station. Otherwise get a new coil wounded for its tweeter by a local speaker specialist.

The most common cause of this is a blown horn. A replacement can be ordered from Mackie directly. Remove the screws that hold the plastic horn in place. At the rear of this part will be the tweeter assembly that unscrews from the horn. This needs to be replaced.

Another possibility is that the tweeter driver has broken from the horn itself and is inside the cabinet. Remove the horn and you may find that the aluminum part has broken. Replace the horn which comes with that part and you should be fine.

Dan

It is a one piece horn need to replace the whole thing. These are not like normal PA speakers where the driver can be unscrewed from the horn lens and replaced.

Confusing - please rephrase and resubmit in form that can be clearly understood.

If speaker works then it is ok. Could be the amp or the crossover cap that feeds the high frequencies to the unit