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Radio Shack Linaeum measurements

Posted 14th March 2014 at 10:40 PM by hbc

I bought a pair of these in about '95 and modified them a bit. I blocked up the ports, stuffed them with fluff, replaced the inductor with an air cored type, and rewired with CAT5. I also removed the top cages and grills which subsequently got lost, and also removed the rubber from the woofer voice coil, and put in a phase plug fashioned from some dowel.

I lived happily with these for about 10 years, ending up with an 18" subwoofer which used an equalised bass guitar speaker. The advantage of this equalisation was a degree of cancellation between the sub and the little woofers, resulting in a very smooth lump free transition in the listening position.

I found them to be an excellent tool in the development of audio stuff, it was quite easy to discern the difference between different types of cables, for me and friends, etc etc.

I bought another pair but I was wondering if the tweeters were fried as they sounded a bit dull compared to my modded ones. Anyway I have measured them now and to my satisfaction all the tweeters behave very similarly. And the bass on the un-modded ones is up a bit. My air core inductor's resistance was higher than the originals, so maybe this was an unexpected benefit that they reduced the bass a bit, and made then sound more even...

And look at that phase, I may have cheated a little with the offset to get the phase 0 in the middle, but that is pretty good integration between drivers for my money, and also the step response looks pretty in phase and time aligned to me.

Note: yellow trace is modded LX5, and green unmodded.
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Comments

  1. Old Comment
    critofur's Avatar
    " it was quite easy to discern the difference between different types of cables"

    Sound quality is irrelevant when discussing cables - the only possible way a cable can be "better" ["sounding"] than a generic copper cable is if it has some flaw which colors the sound, which should not happen with any properly designed cable.
    permalink
    Posted 16th January 2016 at 10:43 PM by critofur critofur is offline
  2. Old Comment
    Oops, upset the Ohm's law enforcement again....
    permalink
    Posted 30th March 2016 at 11:58 AM by hbc hbc is offline
 
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