help lost high frequencies on Energy C8 speakers

[jwmm7]

Ok so the situation is, I have a pair of C8HB-1 tower speakers hooked up to a marantz SR19/V1B reciever. I was playing it moderatly loud nothing crazy for sure and then the high frequencies just dissappeared.

The two 8 inch speakers in each speaker seem to be working fine still i think but everything sounds really muddy and low no distortion mind you, even when turned up very loud. But i think it just sounds so low because the tweaters are blown out on both speakers. It seems weird that both tweaters would completly blow out (no sound is coming from either of them). Two times now they've randomly turned back on for a very short while (seconds) and they sounded fine but didn't have time to investigate because they turned off quickly.

I checked out the crossovers in the back and didn't see any scoring but i don't really know what i'm looking for either, there didn't appear to be any burn marks on them.

So i was thinking it might also be the reciever with some weird problem but when i switch it to surround sound mode there are still high frequencies in the other speakers but still not the tower speakers. I'm still not ruling out the reciever.

About 10 minutes before the speakers lost their tweaters I had a huge feedback problem where a microphone hooked up through a mixer caused a very high pitched feedback loop. I thought i was lucky they didn't blow at the time because they still sounded fine but then 10 or 20 minutes later the high end just turned off like a switch on both speakers at the same time. I have a mixer hooked up for recording purposes and don't overuse the stereo system.

Ok after all that anyone have any idea. Its my brothers stereo system, and i was watching his house while he was gone, so i need to fix this

[BHTX]

Sounds like an issue with some kind of protection circuit on the tweeters malfunctioning for some reason..
But then again, I don't know very much.

Have you tried connecting them to something else?
It doesn't sound like it'd be the receiver, but just to make sure..
If you don't have anything else to hook them up to, try connecting them to the surround outputs?

[jwmm7]

I just tried switching my center channel on the reciever, which i no works fine, with my tower speaker and it still sounded the same (the tweater still didn't work).

I also thought about some sort of protection circuit also but have no idea what that could be.

So the problem is definiatialy in the speakers. I talked to the Energy speakers guy and he didn't have an answer either. mmm

[BHTX]

Originally posted by jwmm7
Two times now they've randomly turned back on for a very short while (seconds) and they sounded fine but didn't have time to investigate because they turned off quickly.

..If it weren't for that statement, it'd sound almost exactly as though the tweeters were just blown. However, that little bit of information kinda throws everything off and raises some questions. With that said, I'm pretty sure it's something within the crossover.

However..

Originally posted by jwmm7
About 10 minutes before the speakers lost their tweeters I had a huge feedback problem where a microphone hooked up through a mixer caused a very high pitched feedback loop.

I've always felt as though good doses of feedback from a mic at good enough volume levels often has the tendancy to melt mediocre tweeters in consumer-grade loudspeakers easier than a lot of people realize. And the same goes for very high frequency test tones, too.

Still though, I think it must be something weird going on with those crossovers. It seems strange though that it'd happen to both speakers at the same time, if that was the culprit. I don't know. I've been checking back here myself from time to time, waiting to see some replies from others, but it seems as though the majority of reglar members are busy for the Thanksgiving holiday.

Is your brother still gone? How much time do you have??

[bluesmoke]

Polyswitch on the tweeter...?

I've seen a few Xovers with them, and they can fail with age, or fatigue/self destruction from having opened often with overloads.

[marchel]

Did you smell the tweeters for burn smell?

I've blown tweeters before when I plugged and played my distorted electric guitar into my stereo system when I was young.

[jwmm7]

Two times now they've randomly turned back on for a very short while (seconds) and they sounded fine but didn't have time to investigate because they turned off quickly.

I don't know if i'd put too much thought behind this statement because it could mean anything because even blown tweeters can kick in sometimes i think and it was for such a short time but it is weird.

Ya and the feedback i was talking about was pretty extreme at the time. But I did not spell any burning at all. This isn't a cheep consumer stereo either its an classic (90's haha) audiophile type system with hard to find expensive parts.

I can't see there being a polyswitch on it they don't usually put those on speakers i thought and i don't think it would be overloaded too often my brother is pretty careful so you think it would do its job if it did exist and reset it self. But if you know what it would look like I'll look for it.

I think i need a way to try and test the tweeters themselves but don't know how to take apart this speaker quite yet but i'm working on it.

My brother actually comes back in 2 days haha so i'm sure i wont fix it before he comes home.

[jwmm7]

Well I had an engineer buddy come over here and we tested some things. Long story short the crossover is fine. And the tweeter must be blown unless there is a fuse or something on the tweeter (unlikely)

So if anyone knows of where to find any energy C8 tweeters I'd be very happy. Or if anyone knows how to get the tweeters out of the speakers that would be very helpful also. thanks

[BHTX]

Here's a photo of the speaker from another website, and some links below. Anyone??
http://www.energy-speakers.com/source/s%20manual.pdf
http://www.audioreview.com/cat/speak...2_1594crx.aspx

[jwmm7]

Ok so we figured out how to get the speaker out by our selves. And the sourround sound speakers are all matched up to this system so we just switched the tweeters out and it all works well. Further inspection shows the tweeters are actually blown but I still think the whole thing is odd.

So now i'm still looking for some good replacement tweeters if anyone knows of any. (still for the C8's because its the same tweeters) And C8's have the same tweeters as C 2's and C 4's. But i don't necessarily need the exact one from energy. recommendations, and i'm paying for it so i don't want to spend a ridiculous amount