LS 90's

drumiv

Hi all. I'm new here, and this is my first post. I have a set of LS 90's I bought new back in '93. At the time I thought they were the best speakers I had heard. I moved, and they sat for a few years before I hooked them up. They seemed like they had lost something. Do they need a re-cap allready? Any help/ sugestions would be great . Thanks

Mystery

If all drivers are working and still lost something, yes.

thsmith

Agree, Might pull the drivers and make sure nothing has come loose. Also, as you probably know LS90s are particular about placement wrt bass.

Here is my upgrade and tweak thread.

http://www.polkaudio.com/forums/showthread.php?141407-LS90-Tweaks-and-upgrades&p=1860633&viewfull=1#post1860633


BTW, welcome to CP. Post some pics of your setup.

westmassguy

drumiv wrote: »

Hi all. I'm new here, and this is my first post. I have a set of LS 90's I bought new back in '93. At the time I thought they were the best speakers I had heard. I moved, and they sat for a few years before I hooked them up. They seemed like they had lost something. Do they need a re-cap allready? Any help/ sugestions would be great . Thanks

I've done several LS90s, they have a mix of Mylar and Electrolytic Caps. The Electrolytics are most certainly aging if not beginning to fail.

drumiv

Thanks, all. I did a sound check yesterday (hooked them up to my SX1980), and all drivers are working. I also checked-out thsmiths thread. Looks like a recap is in order. I just had a set of KLH Five's recapped; I can't wait to hear these 90's when done. I did notice they sounded better with the 1980. It's putting out over 325 wpc, after re-capping.Is there a parts list? Thanks again.

westmassguy

Find your schematic here: http://www.polkaudio.com/forums/showthread.php?38755-POLK-AUDIO-Speaker-Wiring-Schematics-amp-More-ALL-MODELS-except-SDA
There are two versions, you'll need to pull BOTH crossovers to verify what you have. I had one pair that had different versions.

drumiv

Thanks, westmassguy. I did take a peek at the crossovers yesterday, and they look the same. How can you tell if the are the original, or revised version?

westmassguy

drumiv wrote: »

Thanks, westmassguy. I did take a peek at the crossovers yesterday, and they look the same. How can you tell if the are the original, or revised version?

The part # should be clearly marked on the circuit board, and will match one of the schematics.

drumiv

What-the-HECK, does that have to do with LS90's?

westmassguy

Already reported it

drumiv

Good man. OBTW, wmg, xo's on there way to my tech. We're going a little more expensive route with the parts. Will report when done.

westmassguy

drumiv wrote: »

Good man. OBTW, wmg, xo's on there way to my tech. We're going a little more expensive route with the parts. Will report when done.

Should have asked for a quote from me

drumiv

This is a parts only deal. I'm building him stands for his L100's (which I also made),but thanks.

westmassguy

No worries, enjoy your build. The LS90s are sweet