[Kevin McMurtrie[_2_]]

In article ,
jakdedert wrote:

I know, I know...but for $9 in good shape at the thrift store, I figured
I couldn't go wrong. No way to test, but the surrounds were in
excellent condition; so I figured at least the woofers alone were worth
$4.50 each.

Brought them home, hooked 'em up, they made noise...so far so good, but
where were the highs? AWOL...crap, blown tweets! Not so fast....

Tested the tweeters with 9v battery--fine. Okay, time to open the box.
Pulled the surprisingly flimsy woofer from the 1/2" MDF box In
addition to the minimal x-over components (resister and cap in series
with the tweeter) was a #561 automotive 'festoon' style lamp in series
with the tweet. Shorting that brought back highs.

Now considering this was a series limiter, should I replace it, or just
bypass? The lamp
http://www.bulbtown.com/561_MINIATURE_BULB_RIGID_LOOP_BASE_p/561.htm
is a roughly 12 watt unit with apprx. 1000 hours rated life. Did it
'fuse', or just wear out?

Strange stuff, this Bose....

jak

Light bulbs are surprisingly good current regulators. Small 12V 15W
bulbs have about 0.7 Ohms cold resistance and a current limit of about
1.2A. This and their slow changes in resistance makes them excellent
speaker protectors.

It's OK to bypass the bulb if the speakers aren't worth protecting. Or
you can just buy a pack of these bulbs at a hardware store for $1.
Since the lighting quality and life of the bulb doesn't matter one bit,
speakers usually have the very cheapest bulbs protecting them.

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