Do all speakers have fuses? I may have blown one of my Bose 151 outdoor speakers, but can't find a fuse inside.
I get no sound from one of my Bose 151 outdoor speakers. I was hoping it might be as simple as a blown fuse, but I can't find a fuse inside. The speaker cone appears to be in perfect condition, but no sound is being produced. Yes, I hooked up the other speaker to the same channel, and the other speaker works find. Many thanks.
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Re: Do all speakers have fuses? I may have blown one of...
Unfortunately many speakers do not have fuses. Most likely the voice coil has opened up inside the speaker itself. You can either get a replacement driver (speaker) or re-cone the one you have. In any case, the driver needs to be replaced.
You can verify this if you use an ohmmeter. With an 8 ohm impedence speaker, the reading should be about 6 ohms. If you read a higher number or infinity, the coil is bad.
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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.
In my case the speaker only played the higher frequencies but not the low mid range to base. Most likely your speaker is "blown". Outdoor use is hard on electrical components. The fix is easy. The free space 51 speaker is identical in size to the standard Bose 901 4 1/2" speaker. You can buy a Bose or a good quality knock off (either way they will need to be broken in before yielding the best sound). It is not clear to me whether the original Bose uses a special moisture resistant cone. I treated my replacement with a light coating of silicone spray (for upholstery) carefully protecting the foam surround and cap at the center.
Just unscrew the three screws holding in the plastic grill in front of the speaker (using a nut driver or socket wrench). The speaker will drop out. Be careful with the foam wrap around the wire as it tends to be fragile and greasy. Solder in the new speaker making sure you get the polarity right (although for outside use this is probably irrelevant). I would test the speaker in place before soldering just to make sure. Reassemble and break in the speaker. Again I don\'t know know well the replacement will weather the elements. Keep your finger crossed.
Fuses are used to control the inflow and outflow of electrical current. They are mainly used in speakers in order to protect them from being blown out. This is why there is a specific number of ohms on the instructions that it can handle. I'm sure there is somewhere. There are fuses in all high quality speaker systems. You'd just have to open the back up in order to find it.
Of course it's worth it - just unsolder the old fuse and solder a new one in. But first make sure the fuse is really blown. Buy a cheap $10 ohmmeter and check it - a good fuse will make the meter respond, or make the ohmmeter beep. Note that a blown fuse might still make the ohmmeter respond, since other circuits connected to the fuse will affect the reading. So look for zero ohms. If you get like 5 or 10 ohms or more, the fuse is blown. It may not be the fuse, but this is the first step to find out. Best way to check fuses is to unsolder and lift one end, so that you're only reading the fuse.