These instructions are intended to help restore any ailing S408 Passive Loudspeaker back to factory working conditions. They show how to remove and replace the drivers. Please contact Mackie Technical Support (1-800-898-3211) to receive a Service Request Number and Order Number for parts needed for this restoration. They will also help you determine the nature of the problem and what parts will repair the unit.
Page 3
Top left woofer replacement: Eight screws need to be removed Six screws need to be removed from from the woofer using the phillips head each side of the front of the grill (twelve screwdriver. Once the screws are screws total) using the phillips head removed, the woofer may be loosened screwdriver.
Page 4
#0011806) where the old one was. Follow the same steps as above, but backwards push down push down 4 to 1. Power up the S408 and the new woofer should now be pumping out glorious lows. Awesome, you just replaced an 8” woofer!
Page 5
Top right woofer replacement: Eight screws need to be removed Six screws need to be removed from from the woofer using the phillips head each side of the front of the grill (twelve screwdriver. Once the screws are screws total) using the phillips head removed, the woofer may be loosened screwdriver.
Page 6
Place the new woofer (part #0011806) where the old one was. Follow the same steps as above, but backwards 4 to 1. Power up the S408 and the new woofer should now be pumping out glorious lows. Awesome, you just replaced an 8”...
Page 7
Bottom left woofer replacement: Eight screws need to be removed Six screws need to be removed from from the woofer using the phillips head each side of the front of the grill (twelve screwdriver. Once the screws are screws total) using the phillips head removed, the woofer may be loosened screwdriver.
Page 8
Place the new woofer (part #0011806) where the old one was. Follow the same steps as above, but backwards 4 to 1. Power up the S408 and the new woofer should now be pumping out glorious lows. Awesome, you just replaced an 8”...
Page 9
Bottom right woofer replacement: Eight screws need to be removed Six screws need to be removed from from the woofer using the phillips head each side of the front of the grill (twelve screwdriver. Once the screws are screws total) using the phillips head removed, the woofer may be loosened screwdriver.
Page 10
Place the new woofer (part #0011806) where the old one was. Follow the same steps as above, but backwards 4 to 1. Power up the S408 and the new woofer should now be pumping out glorious lows. Awesome, you just replaced an 8”...
Page 11
High Frequency Driver replacement: Six screws need to be removed from Twelve screws and fl at washers need each side of the front of the grill (twelve to be removed from the horn assembly screws total) using the phillips head using the phillips head screwdriver.
Page 12
High Frequency Driver replacement continued: Carefully begin to remove the entire horn assembly (with the high frequency driver still attached). Caution: The horn weighs about 8 pounds, and the weight is unevenly distributed. This is what it looks like with the grill and horn assembly removed.
Page 13
(part #0008093) where the old one was. Follow the same steps as above, but backwards 8 to 1. Power up the S408 and the new driver should now be pumping out those highs again. Fantastic, you just replaced...
Diaphragm replacement: At the present time (January 2007), diaphragms are not currently available, so you will have to replace the complete driver following the previous section (pages 11-13). If you have received a diaphragm, please follow the steps below. Follow steps 1-5 of the high frequency driver replacement instructions, as the horn will need to be removed in order to access the diaphragm.
Page 15
(part # coming soon) where the old one was. Follow the same steps as above, but backwards 6 to 1. Power up the S408 and the new diaphragm should now be pumping out those highs again. Sweet, you just...
Page 16
Input assembly replacement: Eight screws need to be removed from the input assembly (located on the rear of the cabinet) using the phillips head screwdriver. Once the screws are removed, the input assembly may be loosened by prying a fl at head screwdriver in between it and the cabinet.
Page 17
Input assembly replacement continued: J3 J3 J4 J4 Thru Thru Input Input Pull out Pull out J3 J3 J4 J4 Thru Thru Input Input Once loosened, the input assembly may be easily removed from the cabinet. Do not completely take the input assembly off yet, as two cables need to be Two cables need to be removed from removed fi...
Page 18
(as shown in the picture above) and place on the new input assembly. Power up the S408 and relish in the fact that you just replaced an input assembly. Hats off to you for a job well done!