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I've noticed that one of the subs in my DefTech BP 2002 goes from 0 to 100 and sounds boomy and bloated. Could this be the 20 year old electrolytics in the plate amp? They get a LOT of use...pretty much daily since I got them in 1995 or so.
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If it stays in the same location and you have noticed it go from good to bloated, yes the filter caps could be the problem. So could a number of other mechanical things mentioned. Electrolytics usually have a useable lifespan of around 15 years. They do deteriorate during that period as well.
I noticed that you mentioned that the speaker has two different inputs. I'm assuming that means one for the speaker and then an RCA connection for the LFE channel.
In any case, my old TrueSub in my office/game room was getting weird and boomy and seemingly oscillating sometimes. I noticed that the cable was bent at the connector and straighten it out somewhat, but it still was not quite right. Finally I pulled out the cable and the center pin stayed in the RCA female on the sub. Needless to say, I had to pull it apart, unsolder the RCA on the sub amp, get shocked by a cap, push the pin back through the RCA female and then resolder to connection on the amp.
It's back to perfectly tuned dinosaur foot fall, sub sonic perfection.
Try swapping the connection between the sub connections.
-Rod
Not a problem to fix it. Adam said it sounds like an amp issue. He will go over some tests with me when I get home. But they support all legacy speakers. Great to hear! I will report back results
That is good they will do that. Switching the woofers will prove beyond a doubt whether it's a bad driver or amp. I tend to lean toward an amp. Fill us in with what you find.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
The volume control for the sub amp? Does it have a crossover frequency control? If so set it low from say 20-40. Does it have a port? Plug it. Ports are often tuned high and add boom. Cram a T-shirt in there and listen.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
No crossover. It's an integrated sub (part of the speaker) so that's not the problem. As far as plugging the port goes, I will try it, but that will only mask the symptom assuming it works. There is another sub in the right speaker that sounds fantastic. In fact, the difference is only felt when watching a movie and the LFE rumble isn't there as brutal (no other way to describe it) as when both subs are "fully operational", as Palapatine would say.
With music or regular TV watching, the missing sub isn't felt. The speakers must do something to differentiate between regular low frequencies and the movie-specific LFE information. I always wondered why these "HT" speakers were better than others at reproducing music.
Actually writing that explanation leads me to believe that the problem may indeed be in the circuitry of the plate amp. Maybe the speaker is treating all low frequencies like LFE info or something. Not sure if that's even possible, but there ARE two seperate inputs.
OK no crossover adjustment as it is fixed and designed to integrate with the other driver. Another key piece of info is the other of the pairvis OK. So bad driver or amp. Switch the drivers and see where the problem is after that. Thatll tell you if its the amp or driver. I thought at first it was a stand alone sub.Good luck.
ET
"If at first you don't succeed, keep on sucking till you do suck seed" - Curly Howard 1936
Thanks!
To you and everyone that's answered. I will tear into it this weekend.
try a different position for openers. If the problem remains, have a tech inspect/evaluate the speakers.
nt
I would suggest that the condition of the woofers surround and the corrugated spider be inspected to check that fatigue has not caused splitting and tearing of the material to occur.
It gets that way near the end you know.
The United States is a collection of laws, badly written and randomly enforced.-Frank Zappa
Haha THATS the problem.
,
Not unstable. Its hard to describe. The bass, which used to be perfectly matched to the rest of the speaker array (that's what they call it) is now either not there or loud and bloated. At first I thought the kids had gone back there and cranked it to watch a movie, but I saw that both the LFE volume and the regular low end volume were right where they are supposed to be. I turned it down and it remained loud and bloaty until I turned it all the way down. Then it was, of course, off.
The slightest tic of the volume knob up makes it immediately too loud. It sounds like I bought a cheap Bazooka car sub and cranked it all the way.
By contrast, the sub in the other speaker sounds just great still.
Yup, send the amp back to DefTech if they say they can fix or replace it. It being 20 years old, don't get your hopes up.
Heck, I found someone to refurb my B&K Reference 50 preamp. I'm as hopeful as a Shirley Temple! Golly mister, my plate amp needs fixin'. Can ya do it for me? :). And he'll say, "Why sure I can!"
Don't know if I can pull of the dress, however.
Could be where it's positioned....try moving it to a different place. It should be set up so that you don't hear it at all...it should make the midrange and highs better.
That's not an option :). These are powered towers with integrated subwoofers. They have been sounding great for 20 years but now something is screwy.
"I've noticed that one of the subs in my DefTech BP 2002 goes from 0 to 100 and sounds boomy and bloated. Could this be the 20 year old electrolytics in the plate amp? They get a LOT of use...pretty much daily since I got them in 1995 or so. "
Yeah, 0 to 100 is your first problem.
:(
Yeah, I can't imagine the volume pot blowing up like that however. I think I will eventually be pulling the plate amp and sending it back to DefTech to see what they can see. Sending the entire tower back is not going to happen.
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