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Power amplifier section circuit in the amp fault. Check and replace damaged component/s at this section circuit. Contact any service technician. This is a skilled work. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
The wattage listed on the speakers is the peak wattage the speakers are rated to handle. You need amplifiers that do not exceed that maximum. A 50 watt amp would drive them fairly well but you would do better with a 100 to 200 watt amplifier. Note: the speaker rating is peak power handling. Amplifiers these days are usually rated at peak output too but sometimes (old or very high quality) amplifiers are rated at sustained power (RMS). If you are working with one of these amplifiers you will need an amplifier with a lower rating. Also make sure the amplifier is designed to run the same load as the speakers. This is usually either 8 ohm or 4 ohm. Make sure the speakers and amplifier are rated the same.
I assume the other two speakers are working fine. Contact Bose and ask them. Could be a simple fuse. Sounds like a fried speaker driver, but do this first. Take the back off and check the power amplifier for a blown fuse. If none, disconnect the power amplifier. Reconnect the speaker cabinet w/o the built-in power amplifier to a known good amplifier to see if the speaker works. If it works then you know its the built-in power amp that's fried. Contact Bose for a replacement or better yet buy a another one with a higher RMS watt capacity. Wattage ratings in other than RMS are worthless. JBL and Cerwin Vega produce high wattage units. You need to keep the volume lower to avoid the problem in the future.
You need an amplifier with at least 200 wpc to get the most out of your BOSE. Look into getting a NAD, ADCOM or CARVER amplifier. I prefer CARVER myself. I am running a CARVER M-500T(251 wpc) on my 901's and they sound incredible.
there are more than 2 fuses in the unit, one is power supply, the others are rail voltage for the amplifier. All must be exact in rating for proper protection from fire and overload. The voice coil coild melt or short, offering partial fuctoinality, but presenting an overload to the amp. Usually this is accompanied by somewhat distorted sound. If you have another one, and are on a budget... swap the amplifiers in the 2 units and see if the problem goes with the amp, or stays with the speaker. Then you will have your answer as to which half of the thing is causing problems. Speaker you can prolly chasnge yourself, the amp will need professional service.
Depending on the wattage of the amp to the wattage off the speakers depends on what to use and how to control them..If your speakers are rated for more power than the amp can produce it will blow the fuses just as if the amp is rated for more than the speakers it will blow the fuse..Those type of speakers do need a good supply of power to run and speaker wire size could play an important part of that.If wire supply is to small it will over heat the coil in speakers and also blow the fuse...Look in side of the boxes to see what kind of capacitors they have on the speakers or there size to insure correct for speakers them selves..Also look at all of the wire routling in the amp to insure proper installation..Hope this helps you..Have a great day
I can think of no reason any amp pushing 120 watts would not work with 901-VI's. They're very efficent and will probably play louder and cleaner than you would ever need. As I recall, my old series IV's have no maximum amplifier rating specified, but I did blow up a bridged Carver M-400 Cube (pushing 400 watts to one speaker with a DVD-Audio of Yes - Fragile cranked dangerously high) with them. I'm convinced my speakers are indestructible in any home application.
Keep in mind that whatever you decide to use as your control/amplifier section, a pair of 901's need a dedicated stereo amplifier. I suspect you're thinking surround sound so a receiver with separable preamp/amp channels, due to the Activbe EQ, would be needed and as far as I know they don't exist. A separate stereo amp for the 901's was my solution. I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers and the Rear Surround channel, with the Active EQ between the receiver and the 901's amp channels. My receiver controls everything and just drives the Center and Surrounds.
Modest amps would work but at very loud volumes may go into clipping, which is bad for any speaker. 120 clean watts is good. I'm using only 110W for mine.
A Carver M-200 is a fine, efficient amplifier that would have you cooking just fine (2x100W).
I would recommend a high power 2-channel amplifier, minimum 16 guage speaker wire, and of course the Bose 901 active EQ that matches the series of your speakers. I use a Yamaha mx-830 power amp & cx-830 pre amp 170 wpc They (Bose) claim that they're unlimited power handling, But if you use a amplifier with to little power and overdrive it to make it louder, you could damage the speakers or amp. With my 170 watt class A amp,the 901 series 6 will blow wind across the room. Go with the best amp you can afford! best for money- Yamaha,Denon,Onkyo!
speakers are suitable to any amplifier, exept for the rating of it. (wattage) sometimes there are some speakers that are voltage needed. well you can use it as a subwoofer output for your tv for better sound.
just buy a aux splitter for the two amplifier, so that you could use them both.
hope I helped you for this.. have funn.^^