Im getting sound through my wired speakers but no bass through the woofer itself, does this mean i have a blown fuse or something more serious?

SOURCE: Regarding Sony SA-WM250 Subwoofer

There is probably a bad solder joint or loose wire inside of the sub box. If you can, unplug the sub, take the screws out and remove the back to inspect the circuit board. A clean solder joint is pointed and shiny, with the solder evenly distributed in the hole. Also check to see if any plugs are loose. Plug in the audio input and then the power, but be very carefull not to touch anything inside the box while the cord is plugged in!! Play some bass at moderate volume so there is pretty constant sound. Now, take a screwdriver with an insulated handle and gently tap around on the connectors and circuit board. Tap a little harder if nothing happens, also tap in different areas to try to force the sound to cut out. You can try to locate where the bad connection may be by tapping lightly and zeroing in on the location. When and if you find the problem, you will need to solder the connection with a soldering iron. If you don't have a friend to help, try a local electronics store. Good luck!

SOURCE: I believe an amplifier problem

I had a problem with no audio and I recently found the fix. When thesub still worked and you turn it on you hear one relay click and thenabout 5 seconds later a second relay clicks and the audio comes on. Theproblem I had lies with that second relay. When you take the case apartthere are 4 circuit boards. The big board with the two big bluecapacitors is the main board. Well next to the two blue capacitors is ablue relay. That relay had a pin that came un-soldered from the circuitboard. I re-soldered that pin and the sub works just like new. If yougo here http://www.eserviceinfo.com/downloadsm/20627/sony_sawm500.htmlyou can find a free service manual that has the wiring schematics forthe amp. Hope this helps!

SOURCE: no sound

I had the same exact problem, here is what someone else suggested I do:

I had a problem with no audio and I recently found the fix. When thesub still worked and you turn it on you hear one relay click and thenabout 5 seconds later a second relay clicks and the audio comes on. Theproblem I had lies with that second relay. When you take the case apartthere are 4 circuit boards. The big board with the two big bluecapacitors is the main board. Well next to the two blue capacitors is ablue relay. That relay had a pin that came un-soldered from the circuitboard. I re-soldered that pin and the sub works just like new.

SOURCE: replacing sub speaker

I wouldn't try reinventing it by replacing the driver. Drivers and their enclosures are designed to work together. And this being a self-amplified subwoofer, there is one more piece that's electrically optimized to the rest. Don't mess with it.

Why don't you just set your receiver's individual relative speaker volume levels so the sub isn't weak by comparison to your other speakers? Weakness, as you call it, is relative.

Is your receiver properly channeling Low Frequencies to the sub? Experiment with the cutoff, too.

This problem doesn't require meatball surgery.

SOURCE: THE SEARCH FOR SONY SA-VA1 SPEAKER WIRES

HEY COWBOY, I ALSO JUST PURCHASED A SET OF THESE TODAY FROM A D.I. STORE IN SALT LAKE (JUST LIKE GOODWILL BUT MANY TIMES BETTER) I TOO NEEDED THE CABLES AND FOUND THEM ON EBAY. HERE IS THE ITEM DESCRIPTION MAKE SURE TO ENTER IT INTO THE SEARCH BOX EXACTLY LIKE I AM GIVING IT AND IT WILL TAKE YOU DIRECTLY TOO THE ITEM.HERE IT IS....Sony #177553111 SAVA SA-VA 1 27 29 55 57 59 SPKR CABLE IF YOU HAVE ANY PROBLEM PLEASE EMAIL ME. i also bought the cable it was i believe 24.95 and 7.95 shipping i think. i used to own this set and they are a very nice tower speaker and sound very good i was fortunate to get mine today for 15.00 minus the center and rears. later jim