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Posted on Sep 19, 2017

I need a replacement bass / mid driver for a KEF Cresta SP3322 centre speaker. The cone is off centre, voice coil is rubbing on the magnet. It's a low quality unit for KEF with a plastic chassis but I can't afford to upgrade yet. KSP 1451. WF-FC250C are the numbers on the magnet shield. I've sent an email to KEF HK but no reply yet. Thanks if you can help. Roger.

5 Related Answers

Ty Keller

  • 2 Answers
  • Posted on Jan 19, 2007

SOURCE: how to test your speaker

Units going into auto protect are usally due to open or dead short conditions to keep the system protected from blowing the final amps. based on what you suggested I woould test or change out the cables 1st.

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Anonymous

  • 14 Answers
  • Posted on Dec 13, 2007

SOURCE: Kef Q Series iQ1 problem

You may have broken the cross over, which is fixable by an service agent, or you may have damaged the voice coil in the mid driver. you can check this by sofly pushing the main driver in, making sure that you done push the cone, if there is a lot of resistance then you have damaged the voice coil, and you will need to replace the driver.

A

Anonymous

  • Posted on Mar 06, 2008

SOURCE: speaker disassembly

I'm going to try to heat it a little with a blow dryer to loosen the glue a little then pry, thanks for your suggestions again

Anonymous

  • 1 Answer
  • Posted on May 11, 2008

SOURCE: The bass speaker doesnt work

OK, Bose owners out there listen up and listen good. Here's the real scoop on 1.(getting access to the inside of most bose subwoofers, 2.( repairing said subwoofer.
 
Follow these steps in removing the cover of your subwoofer. Unscrew the two screws from the cover. (They are on the input/output side of the cover) Remove the two knobs (Bass and treble volume).
 
On the opposite side of the cover, (put those damn shoes back in the closet) there is a lockout tab that needs to be swung out, it moves 90 degrees in a counter-clockwise direction and is located under the center of the cover.
 
A small flat blade screwdriver works great for swinging this tab out and will be necessary for the next step (the screwdriver that is).
 
On the same side (opposite the input/output side) there are two small tabs near the edges of the cover, one on the right and it's counterpart on the left. If you look closely in the gap between the cover and the sub itself, you will see these 3/8" wide tabs near the edges and towards the top of the cover.
 
With the flat blade screwdriver, put the blade between the cover and on the tab and pull down. Then with your hand balled into a fist, gently hit that side of the cover towards the input/output side. the cover will move only slightly but the tab should remain depressed.
 
Do the same procedure on the opposite side of the cover and it will slide about a 1/2 to 3/4" towards the input/output side and can then be removed by pulling it straight up and off of the cabinet.
 
Yay! If you get this far without incident then you are ready to implement repairs. In the case of the AM15's, normally what happens is a resistor will open up and prevent the triac (turn-on device) from firing.
 
The fuse is on the underside of the PC board and this above mentioned resistor is a 100 ohm, surface mount "chip" resistor on the top side of the PC board. It will not appear to be bad but trust me, if the fuse is good and the sub will not turn on... replace it!
 
You don't have to use a chip resistor since as a consumer you may have a rough time finding one but a 1/8 watt or 1/4 watt resistor you can find at any Radio Shack will work just dandy in this application.
 
Cut the leads short and solder the two cut leads to the pads on the circuit board where the chip resistor is currently sitting. The chip resistor will be black, about 1/4" long, 1/8" wide and have "101" printed on it's surface. On some models they used two 200 ohm resistors in parallel but the result is the same. One 1/4w axial lead resistor will do just fine. Plug it up and give it a try. (Before you replace the cover).
 
Secondly, if the fuse is blown on a "Lifestyle" Bose subwoofer, contrary to popular belief, it blew for a reason. The speaker outputs and the subwoofer output devices are TDA7294 IC's with TIP142 and TIP147 Motorola transistors used as current supplements to these said output devices. If the fuse is blown and replacing it only results in another blown fuse then chances are good that one or more of these are blown. In some cases it's very easy to tell, the front of these IC's will be blown off and/or you will see burn marks on the board where they are mounted. These devices are located inside the amp portion of the subwoofer. (The black metal heatsink underneath the input/preamp PCB. As a consumer, if the fuse is blown, unless you are familiar with soldering techniques and troubleshooting electronics, leave this to the pro's. It isn't as easy as you might think and you can destroy the PCB in your attempts to repair it.
 
 This was from a Guru of Bose systems at ecoustics.com: Mark Burgess

Anonymous

  • 1 Answer
  • Posted on May 28, 2009

SOURCE: speaker repair

Contact MMats Pro Audio at 561-842-0600. They can re-cone it for you, or sell you the re-cone kit. If that does not work for you, contact MWA Speaker Parts in Tuscon - 520-647-7193. They can sell you a re-cone kit, or they can direct you to a speaker repair center near you. A third option would be to contact Sundown Audio in Troutman, NC. They may be able to re-cone it for you.

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