LSi15 crossover

Buke9

Does Polk offer a new crossover for the LSi15's?

[Deleted User]

Hello,
Yes, you can order a replacement crossover from Polk CS, on Monday, at 1-800-377-7655 or contact them via email to: polkcs@polkaudio.com
Regards, Ken

Buke9

I guess I should say that my right side crossover has fried and that is why I ask.

PSOVLSK

Or take this opportunity to upgrade the crossover is funds allow.
http://forum.polkaudio.com/discussion/134268/polk-audio-lsi15-crossover-modification-thread#latest

Takes the 15's to another level. Worth the price, especially since you have to spend money to replace it any way.

F1nut

I guess I should say that my right side crossover has fried and that is why I ask.

I'll assume you fried the 5 watt resistor, a common issue. If so, just replace it with a new one of the same ohm value, but a higher wattage rating such as 10 watts. Do both crossovers.

tonyb

May we ask what your driving the LSI15's with ? That might also be a problem if it's not a good 4 ohm capable amp.

Buke9

I'm driving them with a Denon AVR 3310CI . I am thinking of getting a better amp soon. I'm thinking of fixing them myself first. The upgrade is a little too much for me to spend right now. Just another question if you don't mind? I pulled the post plate off and saw the resistor that was burnt. Is that the only part of the crossover or is there another section of it somewhere else and also do you pull the drivers out to get the crossover free? Thanks for your help.

F1nut

First off, you have an AVR, not an amp. Another AVR isn't going to be any better at driving 4 ohm speakers. If your current AVR has pre-outs you can add a two channel amp to drive the LSi15's.

That should be the only crossover. You'll need to disconnect the wires from the drivers. Make sure to mark which wire goes where.

Buke9

When I bought them I didn't realize they were 4 ohm.They came in a package deal with a PSW 111 powered sub if you bought a certain amount so now I have two of the little subs thought they would work with my AVR setup (did not research for that purchase).
Now I am planning on getting an amp just for them. Yes the Denon has pre's for every channel. I am thinking of buying a new DAC soon for my new headphone setup (whenever Cavalli builds my new amp) so I was thinking of making a whole other setup for the LSi15's.

Buke9

OK I got the crossover out and the resistor on the good unit is also damaged. I can't see any markings on it to find a replacement.
Does anyone know the part number or value of this unit. Without schematics it's hard to tell. Any help would be great.

ZLTFUL

Here is the link to the LSi15 crossover schematic.

If you can get me a top down shot that shows the board markings, I can tell you exactly which one it is but I am betting it is a 2 ohm resistor as there are three 2 ohm resistors and one 3.5 ohm resistor in the crossover.

Buke9

Hope this helps.

ZLTFUL

Ok. I am fairly certain that is one of the 2 ohm resistors.
But to confirm, what is stamped on the resistor marked with the red arrow in the picture below? Is it the same (Ph)5W2R0J or different?

Buke9

5w3r5j

ZLTFUL

Confirmed, it is a 5 watt, 2 ohm resistor that is cooked.

Personally, I would replace them all with 10 or 12 watt Mills resistors in the same resistance values (three 2 ohm resistors and one 3.5 ohm per speaker).

Buke9

That was going to be my next question should I replace them all. Another thing when I look up Mills 10 or 12 watt 2 ohm resistors they don't look the same as the ones on it. Does this matter? They look like what I think a resistor looks like and not the big ceramic things that are on it. Am I looking at the right thing? Can you give me on a good place to source these ? If you don't mind. Thanks

DollarDave

Buke9 wrote: »

That was going to be my next question should I replace them all. Another thing when I look up Mills 10 or 12 watt 2 ohm resistors they don't look the same as the ones on it. Does this matter? They look like what I think a resistor looks like and not the big ceramic things that are on it. Am I looking at the right thing? Can you give me on a good place to source these ? If you don't mind. Thanks

Www.soniccraft.com

I would replace them all.

ZLTFUL

^ This.
And the visual differences are the construction method of the resistors.
The style that Polk uses is a cheaper to manufacture part and is one of the compromises they have to make when they bring a product to market at a certain price point.
There are many different types of resistors and they all do the same basic thing...wire wound, sand cast, metal film, etc.

Run with the Mills from Soniccraft and you will be golden.

Buke9

Thanks so much people you all help been so much help. Now all I need is 8 resistors a new roll of solder wick (and maybe a couple beers ; ) ) and I'm ready for the hunt of a new amp to run these puppies properly. But that is another subject for a different forum. Thanks again all !