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September 15, 2008 - 6:40pm
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SPICA TC-50 Restoration and Measurements
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Nice-
Loved my old Spicas! They finally sort of got sluggish after many years though. Then they just died during a move. I think it was the cross-overs.
Anyway- they imaged liked nothing else and sounded sweet indeed. Cool project!
Ditto!
My brother had a pair for many years and loved them.
Yes, I like the fact that they are not just the usual box speaker and involve some innovative thinking.
Pete B.
Taking your statement at sole value I would suspect you like BOSE as well. Personally, I don't have a problem with either; i.e. innovative thinking, BOSE, as well as, SPICA.
Ha,ha ... That would be an incorrect interpretation!
I was of course speaking of innovative designs that sound good.
Pete B.
That's some great work Pete. I've watched at least 6 pairs of those go by me locally and I gotta make the jump. It's an interesting bookie indeed.
I look forward to more of your work.
Mark
Thanks Mark!
I am enjoying the detective work here to figure out the engineering behind the TC-50s. They are certainly not the average box speaker.
Pete B.
I mentioned in the writeup that one system is more efficient than the other and found that one of the woofers has been replaced. The B system has an S3.8-10 woofer, and it must have been replaced at some point, it should be an H3.7-8 woofer. The best solution would be to replace it with the correct service code, or at least and H spec woofer.
Anyone have a spare SPICA TC-50 H3.7-8 for sale? Or a close one.
The other system has the correct woofer.
Pete B.
Interesting set of measurements--thanks!
Most "time aligned" and "phase coherent" speakers are in fact so only on a very narrowly defined design axis. Listen/measure just a little above or below this axis, the phase goes wacky and the frequency response starts to deviate significantly from flat, as shown in your graphs. Stand height is critical.
Yes, it is of course dependent on driver distance, and is no longer an issue when the drivers are coaxial.