Motion Sound KBR-3D - Manual (Page 6)

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Rotary Horn: The horn driver of the rotary channel utilizes a proprietary 80-watt diaphragm
specifically designed to reproduce organ sounds from modern and classical keyboards.
These instruments rarely needed response above 8 kHz. The driver provides rich,
“musical” response over this most desirable range. (You must use a Motion Sound MS
1.2 proprietary diaphragm.)
-INTERNAL ADJUSTMENTS AND MAINTENANCE-
Cabinet Finish
The new Polymaric (proprietary polymer) finish is similar to a “truck bed-liner” coating.
Wiping the finish with a damp cloth should be all that is needed.
Speaker Replacement/Removal
Remove the screws holding the respective grill cover on to gain access to the speakers and horns.
The 10“ speaker is removed from the front and must be removed first to allow access to the rear
mounted horn. The horn crossover is mounted on the rear of the horn and must be included with
a replacement.
Carefully remove the four mounting screws and remove the speaker from the front. Disconnect
the two crossover wires (note polarity) to allow removal from cabinet.
Amplifier, Tube, Belt, Diaphragm Removal/Access
1. Remove the 4 screws on each grill cover and remove both grill covers.
2. Carefully remove the two 10” speakers and disconnect the spade lugs (note connection
polarity when removing the wires), then remove the two tweeters.
3. Remove the 3 screws on the round black plastic axle support on the top center of the cabinet
and lift up and out the support. This is the last part to be replaced on re-assembly.
4. Inside each speaker cabinet there are phillip screws that go up into the metal chassis, remove
them. (7 in the left and 5 in the right side).
5. Remove 6 phillip screws on the back of the chassis.
6. Slide the chassis out the rear, be careful to feed the speaker wires through as the chassis
moves out.
For Horn Diaphragm Removal
7. The diaphragm is located through the bottom access hole of the chassis. Remove the 2 spade
lugs.
8. Remove the diaphragm, it may be a tight fit so a little force is okay. (note orientation)
9. Diaphragm Replacement Instructions will be sent when you order your MS 1.2 from Motion
Sound.
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