Velodyne HGS-10B question

I bought it new in 1998 and it stopped working about five years ago. So, I thought I would try to fix it. I had forgotten how it worked when it failed so thought it might be a fuse. I plugged it in yesterday and It makes a low pitched sound that gets louder as I turn up the volume control on the back. So, if it has a fuse, that is not the problem. It looks great and I would hate to put it in the trash. Guess I'll put it on ebay.
 
A miricale just happened. Yesterday, only tried it with the interconnect running to the right channel. So, before putting it on ebay I just connected the IC to the left channel and it sounds great. I reconnected the IC to the right channel and it also sounds great. Maybe it sat unused for too long a time and just needed a kick start. I'm playing some jazz with upright bass and forgot how musical the sub is. It was always in a front corner of the home theater room and used for movies with loud, deep bass like top gun. Now I plan to use for stereo music so would the balance be better if placed centered between the front speakers?
 
I hope it will keep working, but it seems you only temporarily fixed some loose contact by rattling the case.
It may work for a while, but don't be surprised if one day it doesn't start up when you switch it on.

If you know someone who can tell which end of a soldering iron is too hot to touch, maybe ask him if he can look for cold solder joints or simply resolder anything in reach (what I do in such cases).
As the fault seems to be non destructive, it may be OK to just leave it as is for now, use it and wait until it quits again.

In most cases a trained tech or good DIYS gux will see what are the weak spots of such an electronic PCB. Heavy parts and places where the PCB bends when heated up are mostly effected.
Maybe no good idea to start your DIYS electronics career on a part that has unprotected mains voltage when you remove it from the cabinet.

Good luck!
 
Sir,
I have no idea what kind of experience you have with electronics. So I try to stay on the safe side and will not push you into any situation that may harm you.

OK, you know a little about soldering and electronics. Perfect. If it plays up again, remove the plate amp from the cabinet and disconect the speaker. You had a problem with that, so you may take out the woofer and look at the inside for some hidden fastener.
Then clean the amp PCB, compressed air works great. Now put it in a comfortable position on your workplace, with a lot of light and check for any visual defects, burned part, just anomaly. You may just solder over any point at the PCB, if you find nothing obvious.
Also, search the internet and Youtube for known problems of your specific sub model.
You may post some high quality pictures, often people here see things you missed.
 
Two day ago it didn't make any sound. Yesterday I reconnected it to the preamp and it sounds great. It was always in a front corner of the home theater room and used for movies with loud, deep bass like top gun. Now I plan to use for stereo music so would the balance be better if placed centered between the front speakers?
I placed it a corner and it sounds great. There is no sensation that the bass is coming from the corner. The bass sound is coming from the same location as when there is no subwoofer. I'm a happy camper.