You are here

Log in or register to post comments
Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
SPICA TC-50 Restoration and Measurements

I am working on a pair of later SPICA TC-50s and have confirmed that the bright top end that was mentioned in several reviews is very strongly a function of listening height. Thought this page documenting the work might be of interest:
http://baselaudiolabs.googlepages.com/MR-TC50-REB.html

I certainly expected the TC-50's to be sensitive as far as listening height is concerned however the measurements show how extreme it really is. I was also able to confirm the mid band (approximately) linear phase response with SPICA's marketing literature.

Pete B.

dbowker
dbowker's picture
Offline
Last seen: 3 months 4 hours ago
Joined: May 8 2007 - 6:37am
Re: SPICA TC-50 Restoration and Measurements

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!

Elk
Elk's picture
Offline
Last seen: 5 months 1 week ago
Joined: Dec 26 2006 - 6:32am
Re: SPICA TC-50 Restoration and Measurements

Ditto!

My brother had a pair for many years and loved them.

Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
Re: SPICA TC-50 Restoration and Measurements

Yes, I like the fact that they are not just the usual box speaker and involve some innovative thinking.

Pete B.

Lamont Sanford
Lamont Sanford's picture
Offline
Last seen: 2 months 1 week ago
Joined: Mar 31 2006 - 8:32pm
Re: SPICA TC-50 Restoration and Measurements


Quote:
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.

Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
Re: SPICA TC-50 Restoration and Measurements


Quote:

Quote:
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.

dorokusai
dorokusai's picture
Offline
Last seen: Never ago
Joined: Mar 28 2007 - 6:42pm
Re: SPICA TC-50 Restoration and Measurements

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

Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
Re: SPICA TC-50 Restoration and Measurements

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.

Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
Re: SPICA TC-50 Restoration and Measurements

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.

BrianP
BrianP's picture
Offline
Last seen: Never ago
Joined: Dec 9 2007 - 5:13pm
Re: SPICA TC-50 Restoration and Measurements

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.

Pete B
Pete B's picture
Offline
Last seen: 3 years 9 months ago
Joined: Jul 21 2007 - 11:49am
Re: SPICA TC-50 Restoration and Measurements


Quote:
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.

  • X
    Enter your Stereophile.com username.
    Enter the password that accompanies your username.
    Loading