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How do I replace the foam in my Bose 501 speakers? Or replace whatever the foam is attached to?

In 2007, I brought them to Bose & they said they couldn't repair them. They probably wanted me to buy new ones. Said the foam was gone.

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Reconnecting/retiring Bose speaker cones. Inside speaker I have four coloured wires....Red,Black, Green & Orange....which connectors do they attach to on the speaker cone?


Since you posted this in cars and trucks I assume this is a bose car system. Most bose auto systems have the amp physically attached to the individual speakers. This means each speaker needs the following wires +12v, 12v ground, + signal and - signal. It also means that the head unit cannot directly drive a non bose speaker. If you are replacing the speakers and bose radio the best thing to do is to run new speaker wires. You can reuse the factory ones if you can identify which ones are what...and that may be a pain. If the bose amps are ok and you want to replace the speaker you would need to leave them connected and wire the new speaker to the wires on the bose speaker that come from the bose amp. Depending on the specific bose system there may be an actual wire that runs to the speaker from the amp but on others the amp is directly connected to the voice coil leads of the bose speaker.

Oct 13, 2016 | Cars & Trucks

1 Answer

Bose free space 51 speaker pair. 1 speaker stopped working. I disconnected non working speaker and hooked up at the working speaker wire and it still didn't work. don't know how to take it apart to...


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.

Jul 23, 2011 | Bose Free Space 51 Main / Stereo Speaker

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To Mr. Hyde: you appear experienced with Bose 501 Series III speakers. I need to replace a burned out glass bulb fuse inside the right speaker, the fuse for the woofer I believe. I think that you said that...


Hello whit_hughes,

Just received your request for some information regarding Bose 501's......... Series III. Your looking for te manufacturers part # for the fuse which is in line with the woofer? The fuses used ON the Series III Crossovers (hard wired/soldered directly to crossover board/componants) have been Identified as BUSS #2494, 2amp, Quick-Blow Glass Tube Type Fuses. The fuse which is in-series with the woofer & the fuse which is in-series with the pair of tweeters are the same! In theory this means that the woofer is capable of twice the wattage of the tweeters due to the tweeters being wired in series with each other..... which in turn divides the power beween the two equaly. On the woofer circuit there is only the one speaker or voice coil obsorbing the power. The woofer circuit being wired in parallel with the tweeter circuit again splits the power between the two cuircuits..... so in an ideal situation the woofer sees 50% total input power while the tweeters each see 25% total input power;;;; totaling 100% total. The way Bose has fused them in the Series III's is such that each branch can obsorb a total of 2 amps before shutting down each indivigual branch. This can be adventageous..... should peak power be exceeded causing loss of full load abruptly, Amplifier Power Output Transistors usually blow..... however when only half of the full cuircuit shuts down due to peak power exeeding limits causing one fuse to open (blow) ... the actual impedance (resistance) of the speaker increases protecting the Amplifiers Output Transistors! Thats the reason for the 2 fuses. Each of them are identical. They are soldered into place.... via the wire which is attached to each end of the fuse. (Note; the fuse "kit" Bose is trying to sell you is an external in line fuse holder for each speaker {costing 1.29 each} & 2 fuses for each holder, One for now & One for Later aftr it blows {costing 1.00 each}..... costing Bose 6.58, neting Bose $13.42 Profit!!!! Keep in mind that this fuse WILL NOT FIX YOUR PROBLEM EITHER! DUE TO THE FUSE WHICH IS PRESENTLY BLOWN HAS NOT BEEN REPLACED!!!!! ) The one that has to be replaced is on the crossover... not between the Amplifier & the Speaker Enclosure. Tools required = 1 Long Big Straight Blade Screwdriver to pry off speaker grill, 1 Phyllips Screwdriver to remove screws seccuring woofer to encloser... be carefull not to damage/tear gasket, 1 pair side cutters to cut blown fuse out of crossover curcuit, 1 pair needle nose pliers to attach NEW fuse to crossover curcuit, 1 soldering Iron & a small piece of solder to re-solder fuses leads securly to crossover curcuit. ( replace gasket, woofer, screws, & speaker grill. ENJOY! Should additionaL informaton be required please let me know.... you'll have to leave me your e-mail address for pictures or drawings.... as I don't think they can be sent through this site. Hope this helps ya..... Its an EASY JOB...... you CAN DO IT! & will be glad you did when your done, they'll sound GREAT! ) GOOD LUCK!

Jun 22, 2011 | Audio Players & Recorders

2 Answers

Hello........ looking for a schematic for Bose 501 series 3 speakers. I need to replace the fuse in line with the tweeters.... its blown & does not have a value on it (unmarked, quick blow, twin lead,...


Did you find a solution? Dunno if it's much help, but I just today picked up some 501s - Series I I think - ugly heavy brown material grilles - but with a manual! No fuses in these, but booklet recommends installing your own in-line fuse holders (!?). Specifies a BUSS AGC-3 fuse for amps under 50wpc; or a MDL-2 fuse for amps over 50 wpc. Can be placed is series with either or the two signal wires. Very strange.... Robin

May 14, 2011 | Bose 501V Speaker

1 Answer

I have a bose speaker and the wires are thick.i couldn't seem to insert the wires into my TX SR 501 receiver.


What model Bose? If the speaker wires have molded ends they are possibly NOT electrically compatible with anything but the electronics they were sold with.

Jan 11, 2011 | Onkyo TX-SR501 Receiver

2 Answers

Recently, I purchased a used set of Bose 901 VI speakers. They are crackling when base sounds play. What is the problem? Was I duped? Is it the speakers or the amp or the volume. Can I repair?


It is likely that the speakers were damaged by someone playing the system at way too high a level.

If the noise sounds like a scraping, then it is the speakers themselves.
If the noise sounds like a breaking sound then it is likely the amplifier.

Another possibility is that if you are not useing a Bose amplifier, then your amp may not be capable of properly powering the speakers.

Jan 18, 2010 | Bose 901 VI Main / Stereo Speaker

4 Answers

Repairing BOSE 901 IV series speakers


The grille will come off if you try to pry it off. Then, unscrew the bad driver. Sort of new ones are sold on E-Bay for not a lot of money. Install the new driver, secure it with screws, and snap the grille back into place.

Apr 24, 2006 | Bose 901 VI Main / Stereo Speaker

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