Mackie S408 Operating instructions

S408 REPAIR MANUAL

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.

Tools needed:

***NOTE: not all tools listed below will be needed for your repair***

• Phillips head screwdriver.

• 3mm allen wrench.

• 8mm combination wrench.

• Solid workbench.

Parts needed:

***NOTE: not all parts listed below will be needed for your repair***

• 8” Woofer (Top Left) Part #0011806 pages 3-4

• 8” Woofer (Top Right) Part #0011806 pages 5-6

• 8” Woofer (Bottom Left) Part #0011806 pages 7-8

• 8” Woofer (Bottom Right) Part #0011806 pages 9-10

• High Frequency Driver Part #0008093 pages 11-13

• Diaphragm Part #coming soon pages 14-15

• Input Assembly Part #0012048 pages 16-18

Safety Warnings:

• Make sure that you disconnect all cords before you begin these procedures.

• Always use safety glasses!

• Please try NOT to touch any of the pcb circuitry, capacitors, resistors, etc.

• Take care to read and follow these instructions. It may help to read the

instructions prior to the repair to get an idea of what it entails.

Top left woofer replacement:

1Six screws need to be removed from

each side of the front of the grill (twelve

screws total) using the phillips head

screwdriver. This grill has a tendency to

want to “pop” off, so please be sure to

hold it in place with one hand or arm

while removing the screws with your

free hand. In addition to the grill, the

screws also hold the decorative trim. The

trim should be removed, too. Keep the

twelve screws in a safe place.

2Eight screws need to be removed

from the woofer using the phillips head

screwdriver. Once the screws are

removed, the woofer may be loosened

by prying a ﬂat head screwdriver in

between the cabinet and the woofer;

a good place to start is in the notches

located just above the horn assembly

and below the woofer (as pointed out

by the arrows in the picture above).

Also note the “tinsel dressing teardrops”

(circled above) which are facing down.

The woofer should be placed back the

same way. It is for visual consistency.

More importantly, the cables from the

printed circuit board to the woofer

terminals are quite short; it probably

would not work otherwise. The eight

screws should be kept in a safe place.

3Carefully begin to remove the woofer.

Caution: The woofer is approximately

8 pounds with the weight unevenly

distributed.

Top left woofer replacement continued:

4The positive (blue and black) and

negative (solid black) cables are still

attached to the woofer terminals.

Remove the cables from their terminals

simply by pushing down on the terminal

and pulling out the cable.

5The picture above shows what the S408

looks like with the grill and top left woofer

removed. 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” woofer!

*If you ﬁnd it too difﬁcult to connect the

cables to the woofer terminals due to

the short length of the cables, there

is an easier (albeit lengthier) way to

connect them. Instead of reconnecting

the cables to their terminals, just attach

the woofer to the cabinet as normal.

Follow steps 1-5 on how to remove the

horn assembly (pages 11-12) as this is

an easier way to access the woofer

terminals without having to work under

such tight circumstances!

push down

Top right woofer replacement:

2Eight screws need to be removed

from the woofer using the phillips head

screwdriver. Once the screws are

removed, the woofer may be loosened

by prying a ﬂat head screwdriver in

between the cabinet and the woofer;

a good place to start is in the notches

located just above the horn assembly

and below the woofer (as pointed out

by the arrows in the picture above).

Also note the “tinsel dressing teardrops”

(circled above) which are facing down.

The woofer should be placed back the

same way. It is for visual consistency.

More importantly, the cables from the

printed circuit board to the woofer

terminals are quite short; it probably

would not work otherwise. The eight

screws should be kept in a safe place.

1Six screws need to be removed from

each side of the front of the grill (twelve

screws total) using the phillips head

screwdriver. This grill has a tendency to

want to “pop” off, so please be sure to

hold it in place with one hand or arm

while removing the screws with your

free hand. In addition to the grill, the

screws also hold the decorative trim. The

trim should be removed, too. Keep the

twelve screws in a safe place.

3Carefully begin to remove the woofer.

Caution: The woofer is approximately

8 pounds with the weight unevenly

distributed.

Top right woofer replacement continued:

4The positive (blue and black) and

negative (solid black) cables are still

attached to the woofer terminals.

Remove the cables from their terminals

simply by pushing down on the terminal

and pulling out the cable.

5The picture above shows what the S408

looks like with the grill and top right

woofer removed. 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” woofer!

push down

*If you ﬁnd it too difﬁcult to connect the

cables to the woofer terminals due to

the short length of the cables, there

is an easier (albeit lengthier) way to

connect them. Instead of reconnecting

the cables to their terminals, just attach

the woofer to the cabinet as normal.

Follow steps 1-5 on how to remove the

horn assembly (pages 11-12) as this is

an easier way to access the woofer

terminals without having to work under

such tight circumstances!

Bottom left woofer replacement:

2Eight screws need to be removed

from the woofer using the phillips head

screwdriver. Once the screws are

removed, the woofer may be loosened

by prying a ﬂat head screwdriver in

between the cabinet and the woofer;

a good place to start is in the notches

located just below the horn assembly

and above the woofer (as pointed out

by the arrows in the picture above).

Also note the “tinsel dressing teardrops”

(circled above) which are facing

upwards. The woofer should be placed

back the same way. It is for visual

consistency. More importantly, the

cables from the printed circuit board to

the woofer terminals are quite short; it

probably would not work otherwise. The

eight screws should be kept in a safe

place.

1Six screws need to be removed from

each side of the front of the grill (twelve

screws total) using the phillips head

screwdriver. This grill has a tendency to

want to “pop” off, so please be sure to

hold it in place with one hand or arm

while removing the screws with your

free hand. In addition to the grill, the

screws also hold the decorative trim. The

trim should be removed, too. Keep the

twelve screws in a safe place.

3Carefully begin to remove the woofer.

Caution: The woofer is approximately

8 pounds with the weight unevenly

distributed.

Bottom left woofer replacement continued:

4The positive (blue and black) and

negative (solid black) cables are still

attached to the woofer terminals.

Remove the cables from their terminals

simply by pushing down on the terminal

and pulling out the cable.

5The picture above shows what the S408

looks like with the grill and bottom left

woofer removed. 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” woofer!

push down

*If you ﬁnd it too difﬁcult to connect the

cables to the woofer terminals due to

the short length of the cables, there

is an easier (albeit lengthier) way to

connect them. Instead of reconnecting

the cables to their terminals, just attach

the woofer to the cabinet as normal.

Follow steps 1-5 on how to remove the

horn assembly (pages 11-12) as this is

an easier way to access the woofer

terminals without having to work under

such tight circumstances!

Bottom right woofer replacement:

2Eight screws need to be removed

from the woofer using the phillips head

screwdriver. Once the screws are

removed, the woofer may be loosened

by prying a ﬂat head screwdriver in

between the cabinet and the woofer;

a good place to start is in the notches

located just below the horn assembly

and above the woofer (as pointed out

by the arrows in the picture above).

Also note the “tinsel dressing teardrops”

(circled above) which are facing

upwards. The woofer should be placed

back the same way. It is for visual

consistency. More importantly, the

cables from the printed circuit board to

the woofer terminals are quite short; it

probably would not work otherwise. The

eight screws should be kept in a safe

place.

1Six screws need to be removed from

each side of the front of the grill (twelve

screws total) using the phillips head

screwdriver. This grill has a tendency to

want to “pop” off, so please be sure to

hold it in place with one hand or arm

while removing the screws with your

free hand. In addition to the grill, the

screws also hold the decorative trim. The

trim should be removed, too. Keep the

twelve screws in a safe place.

3Carefully begin to remove the woofer.

Caution: The woofer is approximately

8 pounds with the weight unevenly

distributed.

Bottom right woofer replacement continued:

4The positive (blue and black) and

negative (solid black) cables are still

attached to the woofer terminals.

Remove the cables from their terminals

simply by pushing down on the terminal

and pulling out the cable.

5The picture above shows what the S408

looks like with the grill and bottom right

woofer removed. 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” woofer!

push down

*If you ﬁnd it too difﬁcult to connect the

cables to the woofer terminals due to

the short length of the cables, there

is an easier (albeit lengthier) way to

connect them. Instead of reconnecting

the cables to their terminals, just attach

the woofer to the cabinet as normal.

Follow steps 1-5 on how to remove the

horn assembly (pages 11-12) as this is

an easier way to access the woofer

terminals without having to work under

such tight circumstances!

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