11T crossover resistor

riglehart wrote: »

Any harm in using a 2.4 or 2.5 in place of the 2.7ohm? They don't have the 2.7. The stock ones say 10% anyway. I assume this means +/- 10%.

I have a feeling this is leading to a full rebuild...

I started out with the Polyswitches, found a bad resistor, might as well do all the resistors, might as well do the caps with the solder gun handy and I'm placing orders for parts anyway.

This hobby is one big slippery slope!

Do the whole upgrade. I recommend Solen caps and Mills resistors. But if you want it to be ultra economical go with the Dayton's. The main thing is getting fresh new parts in there as the old electrolytics are probably way out of tolerance. Not to mention I'd be suspect of the one xover because of the burnt resistor.

If you are going to keep the 11t's for awhile the more expensive Solens and Mills are certainly worth it. I might add the RD0 tweets will sound fantastic also.

H9

dorokusai wrote: »

I would use a 2.5 since it's available.

I have yet to see a Polk speaker X-over "out of tolerance" and all it takes is a VOM.

So you think the 20 year old electrolytics are still right on the money

FWIW,,the mills resistors are 3.50 each.

Edit,, 3.50 is for the 12 watt,, the 5 watt is 2.15

riglehart wrote: »

Ok. I'm going to do the whole works. I got the schematic from Doro's VERY NICE thread with schematics.

Couple questions. The schematic shows 3 caps. 12uf electrolytic, 12uf mylar, and 34uf electrolytic.

The 34uf looks like your run-of-the-mill electrolytic. Electrolytics need to be put in with a certain polarity and "mylar" doesn't matter? The pic below shows a 6.8 and 5.6 stacked to get 12.4uf (instead of 12uf) and the schematic says "electrolytic" for these. Can I replace these with a single Dayton/Solen polypropelene cap. Or do I need an electrolytic cap?

In a recent thread someone said "dump the electolytics and get Solens". Does that mean electolytics can be replaced with regular?

The picture is here...

http://www.polkaudio.com/forums/showpost.php?p=644273&postcount=1



Why can't I repost this picture??? The BBS says I already have it, but I can't figure out how to reuse it.

The caps are all non-polarized. Mylar/Polyproylene are better than the more common electrolytics. They are completely innerchangeable, but I don't rec mixing them together. Get two 12 uF and one 34 uF and Mills resistors for each x-over.

heiney9 wrote: »

That is my quest to fill every land fill with 20+ year old "way out of tolerance" electrolytic caps.

No, but we all know caps from today are generally better than the caps of 20 years ago. If he's going to start replacing other parts why not do them all. Also I'd suspect Polk didn't use the greatest parts at that time either.

If he weren't tearing them apart already perhaps it wouldn't make as much sense.

You wouldn't put new pistons in an engine and reuse the old worn piston rings?

H9

P.s. You type rather well while touching yourself!!!

I agree to a point. I believe in the benefit of upgraded components, just not the neccesity of them. Did you upgrade your components based on what you read or what you heard?

I've rebuilt speakers, crossovers and gear in regards to components but that was more of a soul searching excercise. Was it an overall benefit? Yes. Again, I've never stated that it wasn't beneficial.

However, it also had nothing to do with tolerance. The components weren't bad. All the components tested fine and within tolerance, it was either a simple upgrade or complete. Just because its a good idea doesn't mean that everything has to be upgraded, or that every component is suspect to scrutiny.

I recently picked up another Anthem Pre-2L and promptly replaced the output stage caps based on a Dodd Audio mod performed on another unit a couple years ago. I'm happy but I was also happy before the upgrade but I knew the changes sonically and it was cheap enough to do. Does this mean every Anthem component needs to be upgraded? No, that's ridiculous.

There are some upgrades that make sense and some that don't but that's personal, and I applaud that. I have an ever changing rig and inventory so crossover upgrades aren't at the top of my list.