Stephens Trusonic tweeter and crossover advice.

[HephaestusInc]

Hey all.
I recently inherited a set of stephens trusonic speakers. 15" woofer, 8" full range, and a trusonic 5kt toroidal tweeter. The cabinets were compromised so need to be rebuilt.

The woofers are in general good condition. One 15" has a slight noise with 40-60hz sine wave but it's unotticed with music so far.
The 80fr seem to be in great condition.

One of the tweeters is gone completely.

I'll post pictures soon.

I'm going to rebuild the cabinets in a 3 way configuration.

I'd like to do an econowave tweeter project to replace the tweeters and am wading through the impressive threads on that. If anyone has a direct line to an econowave project with 2khz+ crossover point, id appreciate a link.

Im looking for info on how to extract the theile-small parameters from the woofers in order to make crossovers for them.

Or

If there are some designs for trusonic woofers around, that would be a great place to start.

Thanks.

 

[Galu]

Welcome to the forum.

I'm not familiar with your speakers, so looked them up!

I'll give your thread a nudge by giving the following link, which illustrates the 80 FR, the 150 FR and the 5 KT toroid tweeter:

http://www.audioheritage.org/vbulletin/showthread.php?3998-Thiele-Small-parameters-for-Trusonic
I'm sure you've seen this link from which, unfortunately, the T/S parameters of the 150 FR woofer are missing!

 

[GM]

Greets!

FYI/FWIW, like Altec and others (dramatically) changing specs with the changing times, a few truly vintage Trusonic measurements here as a counterpoint: https://web.archive.org/web/20070806055141/http://www.wmeckle.com/ASHLEY/Ashley.htm
In short, best to (re) break in the drivers and measure with REW or similar (Google) before potentially wasting time on box alignments as so often happens with vintage drivers even when using a theoretically correct vintage cab design: https://www.roomeqwizard.com/

Note that we ideally need your electronics' total output impedance (Rs/series resistance) as it 'weakens' the motor's effective 'strength' (Qes, Qts), otherwise the cab can potentially be (way) too small if driven with certain type tube and/or matching impedance systems.

 

[HephaestusInc]

Welcome to the forum.

I'm not familiar with your speakers, so looked them up!

I'll give your thread a nudge by giving the following link, which illustrates the 80 FR, the 150 FR and the 5 KT toroid tweeter:

http://www.audioheritage.org/vbulletin/showthread.php?3998-Thiele-Small-parameters-for-Trusonic
I'm sure you've seen this link from which, unfortunately, the T/S parameters of the 150 FR woofer are missing!

Thanks Galu. I have seen that one. I also found the sticky about building crossovers with unknown drivers that I'm going to dive into. Thanks for the bump!

 

[HephaestusInc]

Greets!

FYI/FWIW, like Altec and others (dramatically) changing specs with the changing times, a few truly vintage Trusonic measurements here as a counterpoint: https://web.archive.org/web/20070806055141/http://www.wmeckle.com/ASHLEY/Ashley.htm
In short, best to (re) break in the drivers and measure with REW or similar (Google) before potentially wasting time on box alignments as so often happens with vintage drivers even when using a theoretically correct vintage cab design: https://www.roomeqwizard.com/

Note that we ideally need your electronics' total output impedance (Rs/series resistance) as it 'weakens' the motor's effective 'strength' (Qes, Qts), otherwise the cab can potentially be (way) too small if driven with certain type tube and/or matching impedance systems.

Dang! Thanks GM! That has the first sniff of the numbers for my 150 woofer I've seen. I am going to look into using REW for impedance curves (no idea if it will do that. But I think so) and I will heed your advice. Thanks much!