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Old 29th July 2007, 12:37 AM   #1
diyAudio Member
Join Date: Jul 2007
Default Greetings from Los Angeles

Though new to this forum, I have been a broadcast and recording engineer for over 25 years. Right now all my stuff is in storage in Boston, so I've put together a cheap, good quality stereo.

I started out with a pair of Polk Audio RT600 speakers that I bought at a thrift store for $75.00. Though the cabinets are in good shape, both woofers were blown and Polk wants $75.00 each for new ones. This is WAY outside my budget now (I live on a showstring, having lost $80,000.00 with a failed business and I have five children including two under 4), so I bought some Panasonic woofers on ebay (the pair for $15.00 shipped). When I installed them, it was very clear that they would not work with the present crossovers, so I changed them to a simple single pole crossover on the tweeter and used the self inductance of the woofer for its crossover. The Polk tweeter sounded harsh crossed over at 2 kHz anyway so I moved it up to 3.5 kHz (where the woofer begins falling off). The crossover is a 4.7 uf nonpolar cap with a .1 metal film across it. I also put a 3 ohm resistor in series with the tweeter to move the crossover freq. up a bit and to lower the tweeter's output. The result is a smooth sounding speaker from about 100 Hz through 20 kHz. The mids sound just great on them!

Next, I bought a cheap KLH powered subwoofer on Craigslist. It handles the low stuff fairly well. Fortunately it has line in jacks that are not connected together.

Then I discovered the Sonic Impact T amp. I bought one for 22 dollars shipped from (using Google checkout). I changed its input caps (see my other post) and use it to power the Polks.

The sound is some ways better then my Celestion SL600's back east when driven by a McIntosh 240 amp and coupled with a Velodyne subwoofer.

My next thing to do (when I save some $$) is to get full range drivers for the Polks (either Fosdex or Hemp Audio) and cross over the existing Polk's tweeter at above 12,000 Hz.

So..I have a pretty decent stereo system for under 200 dollars complete.

Next project is to build a preamp. National Semiconductor has some new really high quality opamps out and they're sending me some samples.
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Old 29th July 2007, 12:48 AM   #2
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FastEddy's Avatar
Join Date: Jun 2006
Location: North Californie
Welcome aboard. You seem like you are quite resourceful when it comes to cranking out the music from a tightly squeezed piggy bank. ...
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Old 30th July 2007, 02:54 PM   #3
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Cal Weldon's Avatar
Join Date: Jan 2004
Location: Near Vancouver
Welcome to the forums. I think many here can relate to your story.
planet10 needs your help:
Let's help Ruth and Dave
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