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JUST MY TWEETER IS WORKING. BLOWN FUSE? CAN IT BE FIXED MYSELF?

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Turn off the amp, change over the speakers turn on amp at LOW volume and listen to music, if same speaker is faulty them bass unit is blown replace or recone.

Posted on Apr 30, 2008

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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 & Video Receivers

1 Answer

My bass part of the pro 150 is working but not the tweeter part...whats gone wrong the diaphragm looks goog so im confused are there fuses in them for seperate tweeter bass etc..thanks hope you can...


Tweeters blow pretty easily. Access the back of the tweeter and touch a weak battery across it's leads. It should click if the coil isn't fried open or shorted.

May 16, 2011 | Audio & Video Receivers

1 Answer

I was doing a party iconnect the mic to mixer, they star to talk paralell with music and blow the upper part of speakers, they sound but not any treble


Hi,
What happened is that the tweeter is blown. or a fuse in the speaker that goes to the tweeter has blown. Hopefully that is it.
There are several causes. Here is the theory so you understand how to match an amplifier to a speaker system.
Tweeters have a much lower capacity for amplifier power then woofers do. All professional speakers as well as home speakers reflect this.
You may ask exactly what blew the tweeter?
Usually what destroys the tweeter is not amplifier power but distortion. If someone is overloading the microphone, or the microphone is not trimmed to the mixer. You get distortion. This distortion is what caused the tweeter to blow. The signal must be clean. If you put too much power in, it may survive OK but if you put distortion in, it will more likely blow.
It is no shame for this to happen. I have had it happen to me when mixing a live show. You just have to watch what is happening and not turn things up too loud so the mixer or the amplifier distorts.
Also when doing sound work, the ears of an engineer naturally lower the perception of loudness. Engineers often keep turning up the equipment up more and more during a performance because they have lost the perception of loudness that was there when they started. That is also the reason that many professional studio musicians and drummers loose much of their hearing at an early age.
Hope this helps,
Happy New Year,
Mark

Jan 02, 2011 | Audio & Video Receivers

1 Answer

Mission 753 spares / tweeters hi can you help me please ? my tweeters from my mission 753 floorstanding speakers have blown.. been in contact with mission, and have been told that they no longer have...


Hi Ricky...saw your post re the 753 Mission tweeters. Your post goes back some months ago but I wondered if you got fixed up with replacement ones or a workaround ??
Regards
Wayne
urban494@hotmail.com

Jan 29, 2010 | Audio & Video Receivers

1 Answer

No tweeter output


sorry but if the woofers work you have blown the mids and tweeters

Apr 30, 2009 | Yamaha RX-V663 Receiver

1 Answer

Will not produce sound through the top end of my speakers,


While this may sound strange, it is not likely the receiver that is the probem, at least at this point. Remove the "tweeters" from the speakers and measure across the two leads. You should read continuity. If not, then the tweeters need to be replaced. I believe that you may have blown the tweeters.

Dan

Feb 06, 2009 | Sherwood RV-7050R Receiver

1 Answer

Tweeter broke need replacement wharfedale


Just google the brand name of your reveivers and ask link site of thier service center so you can order the spare for tweeter don,t forget give also the model number.

Hope it may help you;
Regards;
VOTIT

Jan 02, 2009 | Audio & Video Receivers

1 Answer

I have a kenwwod AX-7 home theatre systems. the right side top speaker (tweeter) on one side does not work. i'm thinking there is a fualt with the amplifier on the right side.


If the only problem is the tweeter, and the woofer is still working, you do not have a problem in the amplifier. The problem is the speaker. The tweeter is blown or you have a problem in the cross over network in the speaker.

You can always switch the speakers and connect them to the opposite channel. You can do this very easy at the back of the receiver where the speaker wires are at. Put the left speaker wires on the right speaker and the right speaker wires on the left speaker. If the same speaker still has no tweeter you know that the speaker is the problem.

The only way this could be a problem in the amplifier is if you have two different sets of inputs for each speaker, one being the low end for the woofer and the other being the high end for the mid range and tweeter. That would mean you have two sets of speaker wires going to each speaker. Each set of speaker wires would have a positive wire and a negative wire for a total of 4 wires going to each speaker. I don't remember this system being set up that way, but I could be wrong.

I hope this was helpful, you should be able to get the speaker fixed at an authorized Kenwood repair center in your area for a reasonable price. As a guide, my shop only charges $25 for the labor plus the cost of the tweeter to replace a tweeter. Any other shop should be similar. Kenwood does sell replacement drivers for almost all of their speakers.


Jun 21, 2008 | Kenwood Audio & Video Receivers

1 Answer

Overload


internal wickman fuses blown check speakers high unts tweeters\ gone short primary transistors /ic blown

Dec 31, 2007 | Technics SA-DX940

2 Answers

No Sound - LCD Volume says 99


Found a solution that works. Power down the receiver. Unplug it from the wall. Wait 10 minutes. Plug it back in and power it back up. Worked like a champ to fix this exact problem with my TX-SR601.

Nov 10, 2007 | Audio & Video Receivers

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