General Boards > Sources for Suppliers, Parts and Maintenance Materials
Bose Invisable Amp Needed
Edward Buker:
Steve,
Bose uses some steering logic and it is not true dolby digital 5.1. Depending on the unit era it may be far from it but will still sound quite good. Before scrapping it try paralleling the speaker leads at the amp end removing the center channel speaker and paralleling it with a right or left. In one or another of the speaker modes you may find little difference in sound and it is worth a try. You will halve the impedance of the speaker to the amp which may up its output a little but I doubt that it would care much. That will avoid the drop outs that you have been hearing which are noticeable.
BTW what was the advice and problem that you found with the fan?
Later Ed
Steve Huber:
Jim,
Let me know if it is available. I'd like to get it.
Ed,
Will try tying right and center together. For a while I had switched right and center but DW is starting to complain about erratic loss of sound so need to fix it.
The fan has been an "adventure". Driver's side gave me good volume but not passenger side. Both had same voltage at input. Switched fans, no joy. then decided it must be a blocked duct or air leak. Pulled ducting, everything looked good. Diverter box worked correctly. Went back to voltage. Both fans getting about 10.5 V on high. But driver's air duct much shorter with vents closer to fan, probably giving the better flow. Spoke with Gerald and he suggested adding relay to supply battery voltage to fan when in High position, bypassing resistor and using High signal wire from switch to drive relay. Fan runs significantly faster with battery voltage applied. Will finish wiring tomorrow.
Steve
Edward Buker:
Good idea Gerald had. Your wife will have her hair flow back hair in the wind now like the models do with all that fan power :-)
Voltage drop in these motor home applications are an issue. They do not want to pay for proper wire sizes adjusting for voltage drops...
Later Ed
Steve Huber:
And the "adventure" continues.
Good news: Finished installation of relay circuit and am now getting ignition buss bar voltage at fan. Fan noise has increased as one would expect when running faster. Also got the wiring diagram of the dash AC/heat circuitry from Ken Carpenter. Original circuit also used relay but the voltage supply ran through a number of crimps as it feeds all 9 relays in circuitry. Also now I know what those relays at the front of my elec. bay are for.
Bad news: No appreciable increase in air flow/volume. (Arrgg..). Since I know fan motor, squirrel cage, and ducting are ok, it almost has got to be that I'm not getting enough air into the input plenum. Had the heater core replaced a while ago so wondering if they somehow managed to seal off the air input to the plenum. Will try to wedge myself up there tomorrow to see what I can see.
Good news: Think I solved the Bose amp problem. While reassembling the dash I moved some wires and found that a couple of the wires were barely connected, just a couple of strands. Ran it for a couple hours today listening to the excellent IMHO music of Thomas Micheal Riley who entertained us at the Kerrville rally. No problem so far.
Guess 2 out of 3 aint bad.....
BTW, if anyone wants a copy of the dash HVAC circuitry, let me know and I'll email it to you.
Steve
Steve Huber:
Repair shop (yeah, I gave up on it) figured out why I wasn't getting good air flow out of the passenger dash vents. The squirrel cage vanes were canted in the wrong direction. Apparently the marquis uses one right and one left canted squirrel cage for passenger and driver fans.
Steve
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