Tag Archives: Infinity

Infinity Sterling SS 2003 Bookshelf Speakers

7 Oct

Yesterday I picked up some Infinity Sterling (model SS 2003) bookshelf speakers on Craigslist for $10. They had the rotten foam surrounds typical of nearly all Infinity speakers their age, so would obviously need some work there. The cabinets are quite heavy and very solid, but I don’t really want to pay for an overpriced woofer refoam kit online, nor do I really want to put a bunch of time into this project (I’ve already got plenty of others on the back-burner) but I think there may be another solution.

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It just so happens I had a couple of Dayton Audio RS255-8 8″ woofers I picked up on Parts Express a few years ago for a project that never came to fruition. That was money spent long ago, so in my mind they’re free woofers in this situation. The SS 2003 has a crossover point of 3khz, and these woofers are only “usable” to 2khz, but I’ll let my ears decide if that’s a big issue. Again, woofers I already had sitting around.

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The Daytons dropped right in with no cabinet modification required. They’re slightly bigger regarding basket diameter, so they sit on top of the baffle as apposed the the inset bevel of the original drivers, but a little mounting foam and a few screws later, they were seated nicely.

The woofers are pretty darn inefficient at 86.2 db versus the original Sterling system efficiency of 90 db, so the tweeter outruns the woofer a little bit, but its a pretty good sounding set of boxes for at total investment of $10 and 15 minutes of repair time. Of course the perfectionist in me always wants to restore speakers to their original condition, but there’s something to be said with working with what you already have on hand.

At the end of the day, it’s nice to have saved another set of speakers from the dump.

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Infinity Qb EMIT Tweeter Repair

12 Apr

Lots and lots of shows at the Gillioz these days, but I’m still finding time to take on a few personal projects here and there.  When I saw a set of Infinity Qb speakers on Craigslist for $50 I couldn’t pass them up.  As seen in an earlier post, I restored a set of Infinity RS5b speakers and fell in love with their sound.  The Qbs are essentially the grandparents of the RS5b.

However when I arrived to buy the speakers, a quick visual inspection (and subsequent listening) revealed both EMIT planar tweeters where non-functional.  You could easily see a tear in each of the drivers, so I talked the guy in to letting me take them home for half his asking price, which seemed fair for both of us as the woofers and mids were working just fine.  If nothing else I could always part the speakers out, though I really hate promoting that practice.

I did a little research online and read about a guy who fixed some EMIT tweeters with this conductive paint used for repair automobile rear-window defrosters.  My local auto parts supplier had some for about $10 a bottle.  An additional trip to Hobby Lobby to find the smallest paint brush I could (the one included with the paint was too wide) and I had everything I needed to tackle the project.

The whole task was a little daunting, as the line I had to paint to restore the circuit was so very small, but it’s hard to break a tweeter that’s already broken so I just dove right in.  I filled in the missing gaps and let the tweeters sit overnight before running audio through them (though I did confirm I had completed the circuit with a volt/ohm meter).

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Low and behold, it actually worked.  I’m still in disbelief, but both tweeters work and sound just as they should.  One of the two tweeters quit working after a few seconds, but a second coat of conductive paint resolved the issue.  We’ll see how they hold up after additional hours of play time, but I’m really happy about how things turned out.

Now I’ve got a (second) cool set of vintage Infinity speakers and am only out about $37.50.  Let the listening commence!

Infinity RS5b Woofer Refoam

21 Jul

I recently acquired some Infinity RS5b speakers in nearly perfect condition.  However, the foam surrounds on the woofers would crumble if you so much as looked at the speakers, but that’s a fix I can handle, and this seemed like a project worthy of my time.

Sure enough, new surrounds were easily found online and with only a few hours of work, the speakers were restored to new.

In my excitement to get these things in listenable condition, I forgot to take “before” pictures, so you’ll just have just take my word for it.