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You have to disassemble the cabinet with a 18 inch long screwdriver first in order to get access to the driver, then remove the 4 allen nuts on the plastic that covers the diaphragm and proceed to change the diaphragm, most of times they start to sound low because they break the titanium in peaces or in a small portion.
1) try a different power cord.if that doesn't work, unplug it for steps 2&3. 2) if you have a multimeter, check the switch to make sure that it's good.3) you should find a fuse on a circuit board if you have the amp opened, check it.If none of these work,send me a good,clear pics of the boards in the amp section. I'll try to ID everything for you. Those are workhorse speakers, well worth fixing.
Go to the link below to either locate a dealer near you for the part or to contact Mackie directly for the part. Please note that the diaphragm may be available as a separate part. Do you need the entire tweeter or just hte diaphragm?
Sorry about the late response. These units are sealed at the factory and opening them up for the first time is a bit of work. Make sure that all the screws are out of the unit and using a large screwdriver, carefully pry up one side. It will be difficult. Apply steady pressure and the back will eventually free up.
I'd just order a new diaphragm and see if that's the problem before any other dismantling. If that's not the problem, I'd take it to a certified repair shop. The fact that it's still working but not producing certain frqs,tells me you won't be able to see the problem with the naked eye.
a new diaphragm can be fitted into the original driver and the speaker will be like brand new. first you must determine if you have the older RCF version (M44TI) or the newer Mackie versions (0008093). There is only one RCF diaphragm that will work for this repair and they are scarce. There are both authentic and aftermarket Mackie diaphragm options and both work very well.
WORLDWIDE DISTRIBUTORS RomaniaRomania - Sales & Technical Support
Mackie sales and technical support in your area are managed by the
distributor(s) listed below. They'll be happy to assist you with your
A.V. Audio Sys
Str. Londra nr. 49 sector 1
011762 Bucuresti , Romania Phone: +40 21 456 1765 Fax: +40 21 456 1765 Web:www.avaudiosys.ro
Stage Expert Ltd
Bucharest Phone: 40 1 334 9924 Fax: 40 1 334 99 28 Web:email@example.com Email:firstname.lastname@example.org