To remove the 15" speaker...remove front grill, remove the four screws holding the speaker driver, then lift speaker out.
Observe the driver.....it's light due to a small magnet, small voice coil, bottom of the line driver. It's worth about $30 and Mackie direct replacement costs $90 to $130. Look online for another 15", 8 Ohm driver instead. Also, add some additional polyester batting. Tuck it up behind the horn and into the cabinet. Be sure to leave space at the bottom so that the bass ports are clear. Compare the two speakers and tell us how it sounds.
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"How to replace bass driver in mackie thump 15a".
Did you mean,disassembly the speaker enclosure?
Just remove the 16 screws at the rear cabinet, using a screwdriver.
Then remove the 4 screws that secure the speaker, using the hex key. Is the bass driver blown up / broke?
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