This seems unusual, at least to me. A colony of Carpenter ants has moved into the bass speaker cavity of my Bose CD Radio. I've removed the grille (with top of case) and have removed the nest material in the front of the channel, but they have built a solid nest toward the back, where it curves, and it looks like the whole thing has to come apart to get it all out. So, the question is, what are the steps to disassembling it to this level. Does the plastic curving bass channel even come apart, or is it glued together.
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Generally, they are held on with a rubber type adhesive. Try carefully to pull up one corner of the grill edge. If it moves, the above would apply. If it doesn't, don't push the issue. Contact Bose. They can tell you.
You should check your 901 speakers for phase.
Heres how to do it........ Remove the 901 speaker grill so you are able to see all the drivers cones. Now connect the 901 speaker wires to a 9 volt battery. Now u can check if all the cones would move forward or backward at the same time. Make sure that they all move in the same direction, otherwise you have to reverse the polarity of the driver that dont move with the rest.
Sounds like you have a problem in the circuits, which of course would take an experience technician to find and repair. But a 1994 electronic item has pretty much reached the end of its expected life cycle (sadly, compared to older equipment which is still working great). Basically, it sounds like the power amp circuit is shutting down a few seconds after startup. Might check to make sure no speakers or cables have shorts, which could activate a protection shutdown circuit. If any of the cubes don't hiss when you turn it on, that would be the first place to look for a problem.
The Bose engineers in their "infinite" wisdom developed a $300 radio with no, that is NO, tone control. This means the only way to tune bass response is to reposition the Wave radio itself. If you put it in a corner of a room, it will produce the most bass. If it is only against one wall, not so much bass. To reduce bass response to a minimum, you would have to suspend the device from a wire in the middle of the room. Good luck. I would never buy a radio without a tone control; I literally inherited by Bose Wave Radio and use external speakers which do have tone controls.