help me rescue my LSi7's

dvdchance

Over the summer I was playing my system a bit loud and basically burned the circuit boards on both speakers. Instead of just leaving them to look real nice collecting dust in my basement, how can I get these fixed?

Does Polk sell the circuit boards whole or can I just solder a replacement diode or whatever? I'm pretty sure the drivers themselves are good since the speakers sounded great till i shut it off. too bad that was when i smelled smoke.

Thanks,
David

pblanc

Leave an email with customer service: polkcs@polkaudio.com. Make an inquiry as to what the cost of replacemant crossovers would be. If the speakers are under warrany explain the circustances under which the event occured and what equipment you were using to drive them. You may be eligible for replacement under warrany. If not, and you have to buy them, don't forget to tell the person you are ordering from that you are a mamber of Club Polk and ask for the 10% discount. They will get back to you promptly. If thats to much trouble, I'll take them off your hands for $50 for the pair. (Just kidding)

dvdchance

Thanks for the reply pblanc.

So thats the crossover that I burned. Anything specific to ask them for?

Whats an app for cost.

AndyGwis

What were you driving them with? Maybe provide some more detail here and instead of just helping you fix your speakers, we can also keep you from blowing them up in the future

Were you passing a 10hz Sine wave through them by any chance?!? Sorry, I just had to find a way to bring this old thread back to life

http://www.polkaudio.com/forums/showthread.php?t=47052&highlight=sine

dvdchance

Thanks Andy,
No sine wave listening I'm sad to say. Just some rap mp3's that did me in.

I was way too heavy on the volume control of my denon 2805 as a pre pro to a Rotel RMB 1075 amp. i believe the most guilty song was 'Nuthin' But A 'G' Thang', so maybe dr dre will pay

I have also quit drinking.

AndyGwis

This is fantastic stuff, dvdchance. Your gear (200 wpc into 4ohms) should be able to drive the LSi7s to fairly excruciating levels, so I'm guessing you were banging that old Dre pretty hard.


Are the Lsi7s your front speakers? Were you running them large in stereo, or small with a sub, or in a 5.1 setup at the time?

dvdchance

Pretty hard times two Andy. Seems like with every beer I drank the volume just needed to be a little louder.

I was running them setup as small with my velodyne DLS 4000 sub. It honestly sounded clean even while smoke was coming out of the back. And that was just a relatively low fidelity mp3.

dorokusai

You could replace the part with an aftermarket substitute, via the wiring schematic that's at the top of the troubleshooting section. I'm pretty sure that the LSi7 is in there. You may or may not have to change both speakers, depending on how hardcore your hearing is, or if you even care.

The circuit board or components are not available individually from Polk, only as a complete assembly which includes the wires, binding posts, terminal cup, etc. I don't know how much it costs.

Good luck.

TroyD

Yeah, I'm sure they can be fixed.....get in touch with Polk CS.

Be more careful next time, eh? Those are nice speakers, it's a shame to see them abused.

BDT

McLoki

LSi7's will not go much above 102db unless it is pretty dynamic material. (i.e. the constant SPL is well below 100db and the peaks are over 103)

I know that is about where mine started to give out. (soundstage started to collapse at about that level) I very rarely went that loud and now that I have the 15's - they reach higher levels that I ever try to exceed.

Michael

Edit - I was mistaken about the DB of the 7's not 105 - it was actually closer to 102-103db.

pblanc

Quit drinking?!? My advice to you, sir, is to start drinking heavily. I think McLoki is right on. I used LSi9s as front speakers at one time and blew a woofer out rather unexpectedly. I really didn't hear anything harsh until it went. I switched to LSi15 mains and have never heard them strain, and have never had a problem (using the same amp) even at relatively loud listening levels.

dvdchance

dorokusai wrote:

You could replace the part with an aftermarket substitute, via the wiring schematic that's at the top of the troubleshooting section. I'm pretty sure that the LSi7 is in there. You may or may not have to change both speakers, depending on how hardcore your hearing is, or if you even care.

The circuit board or components are not available individually from Polk, only as a complete assembly which includes the wires, binding posts, terminal cup, etc. I don't know how much it costs.

Good luck.

Since what I would have to replace is only available as a complete assembly, I really don't have much to lose by trying a replacement part then right? Only the cost of the blown part itself, I can't break it any more.

Where could I source the replacement part at? Radio Shack? Parts express?

pblanc

If you don't know the answer to that question, I'm not sure you should try. If you have a local electonics repair shop (check yellow pages) you could pull out the crossover and ask them to take a look at it and see what would be required to fix it. If you know how to use a multimeter and a soldering iron, have both, and have soldering skills, you might try it yourself, otherwise I suspect you're wasting your time.

polka boy

What was the final resolution. You can't leave me hanging her like Lost or 24. I have a pair LSi7's that I plan to use at the bar in my basement and also a 1075, I also like to drink beer and turn it up. Am I too going to smoke the 7's?