Monitor 7C tweeter repair

[MarkL]

I blew both tweeters in my pair of sweet Monitor 7C's. What is the recommended part to replace them?

[NJPOLKER]

Welcome to the Club.
It's going to depend on which tweeters they are. Can you post pictures? If not look search the forum to find a picture of what you have and post it here and the guys will assist.
What are you using to drive the 7's?

[george daniel]

I can't remember,, are the 7c's fused? If so did you check them,,if not check the polyswitch??

[MarkL]

Both tweeters play, but they are fuzzy and distorted. The other drivers seem fine. (I've blown out the mids before, many moons ago, so I know that that sounds like too!)

I was driving them with a Carver Receiver 900 (90 wpc) in a 2-channel config. Was playing the "Eagle Eye" Blu-Ray on my brand new PS3. There's a scene early in the movie where the hero and heroine are fleeing in a car and someone shoots out the back window of their car. That gunshot is what caused the problem. :) Stupid Blu-Ray dynamic range!! :mad: :)

I'll get some photos up promptly.

[everpress]

Polk lists these as having a recommended amplifier power of 20-150watts per channel.
I'm new to the speaker scene, which will be more obvious by my next question:

How do you blow speakers rated at 125 recommended watts with a 90 watt/channel receiver?

And I'm asking because I have the rta-11tls rated to 250 watts and am pushing them with a very conservative HK receiver at may 65 watts/channel.

[george daniel]

My guess is that you "clipped the amp", thus smoking your tweeters in the process,, careful with the volume Eugene,, or,, get a bigger/mo powerful/higher current amp,, you'll do far less damage than you will underpowering IMHO--good luck.

[ben62670]

Call Polk CS. You may have the SL2500 in those, and the new replacements are the RDO-198's. If they are the SL2000's the replacement part is RDO-194's. Mention that you are a Club Polk member to get the discount;)
Take care.
Ben

[MarkL]

My guess is that you "clipped the amp", thus smoking your tweeters in the process,, careful with the volume Eugene,, or,, get a bigger/mo powerful/higher current amp,, you'll do far less damage than you will underpowering IMHO--good luck.

I'm quite certain that's exactly what happened. That Carver is a real trooper, but the transients in that gunshot probably caused it to clip for an instant.

My long-term goal is to upgrade, but budget is tight, so a tweeter replacement and some caution in the volume department is all I can do for now. I've got a line on a used Sunfire Cinema Grand 5x200, keeping my fingers crossed....

[NJPOLKER]

You will want to fix the problem before buying new tweeters or you will literally blow
$100.

[MarkL]

OK Here is a pic of my tweeter. However, while taking this pic, I noticed a small tear in the rubber surround of the midrange driver. I hadn't even seen it before. I've attached a pic of that too. What's really weird is ... when I checked the other speaker, THAT midrange had exactly the same kind of tear is exactly the same place!

Is a small tear in the surround something that would lead me to need to replace those too? If I have to replace enough stuff, I might be getting into just replacing these with something new (and then repairing them later! ha)

[skrol]

Those butchers!

It is a lot to have to replace tweets and MWs all at once. You could try a little rubber cement on the tears. Just a little along the edge of the tear and mate the edges together. No glops. It may not be optimal but it should get you playing for a while. Then replace the MWs later (unless you really want something new).

[NJPOLKER]

You can buy a pair of tweeters from Polk for around $100. shipped. You want the
RDO-194's and be sure to tell them you are a memebr of this wonderful forum. They do sound nicer than the SL-2000's you are replacing. Remember that they take a little time to break in. Try and be careful with the volume or you may blow the RDO's.
It may be a good idea to look into something like a integrated amplifier. A good one can be found for around $200.
Good luck

[NJPOLKER]

http://www.polkaudio.com/forums/showthread.php?t=83690

This would be awesome!!!

[NJPOLKER]

Did you buy it yet?? Don't wait too long!