Speaker I.D. and crossover help please

[Moth R. Superior]

Hello,
I've recently purchased a pair of unidentified speakers that have a crossover like I've never seen.
They appear to have 3 caps and 2 resistors. (2 1uf 50VPC, & 1 10uf 25V)
They look pretty old as they still have RCA jacks to hook them up.
The boxes are real wood veneer, & they're very heavy.
here's some pictures
Thinking of recapping...
Any info would help!
THANK YOU IN ADVANCE!

 

[Guest158]

Looks kinda like something Magnavox...

 

[Moth R. Superior]

Looks kinda like something Magnavox...

Really? That's definitely uncharted territory for me.
The woofers are the type of speaker that you "dope" (much like KLH Model 6's,) then the horn, and the tweeter is the only 'cheap" looking part, i guess.

 

[RTally]

I would rebuild the crossovers, including replacing the carbon resistors. One resistor looks like a 47 ohm 10% and the smaller resistor looks to be 15 ohm 10% tolerance.

 

[Guest158]

Ahh.. couldn't see surrounds but horn looks like what was in some Magnavox I once had. They were only 2 way.

 

[RTally]

Be sure to sketch out the crossover circuit. I can imagine one of the 1uF caps and the 10 uF cap being used as a first order filter for the tweeter and mid. One of the resistors and the other cap could be a Zobel network, but that would be unusual for an older, vintage speaker.

 

[Dan ʕ•ᴥ•ʔ]

Looks kinda like something Magnavox...

I agree!

 

[Moth R. Superior]

Be sure to sketch out the crossover circuit. I can imagine one of the 1uF caps and the 10 uF cap being used as a first order filter for the tweeter and mid. One of the resistors and the other cap could be a Zobel network, but that would be unusual for an older, vintage speaker.

Okay. Thanks. One question, what is a ZOBEL network?

 

[RTally]

Okay. Thanks. One question, what is a ZOBEL network?

A Zobel network is often used to cancel out the reactive portion of loudspeaker impedance or to even out the impedance load to the amp.

http://www.wavecor.com/html/zobel_networks.html

 

[Guest158]

Probably there to tame the horn response.

 

[Moth R. Superior]

A Zobel network is often used to cancel out the reactive portion of loudspeaker impedance or to even out the impedance load to the amp.

http://www.wavecor.com/html/zobel_networks.html

WOW, THANKS!

 

[Harvestor]

Same horn Mid-ranges that my Acoustiflex model 12 have....15in CTS Woofers in mine.

Acoustiflex was the House Brand of Stereoland and Made in Detroit metro area late 60's early 70's..
Mine were Made in 71 or 72

Yours could be Acoustiflex also...??

 

[Moth R. Superior]

Wow, those are sexy!
My tweeter is a lot different, but I suppose that doesn't mean anything..
Mine have 10" woofers, the horn, and 3 1/2 inch tweeters.
The horn is actually quiet compared to the tweets..

 

[Moth R. Superior]

How long did they make the hookups the RCA type? That is, what year did they switch to clips?

 

[Moth R. Superior]

The only time i've seen "doped" woofers were in KLH, or AR's....
(they're obviously not either of those)

 

[toxcrusadr]

Black sticky accordion surrounds = CTS but they sold millions of drivers to all kinds of speaker makers. CTS is 137 so if you see that code on the woofers...

As someone else mentioned, the lack of inductors in the crossover probably means each driver is running 'wide open' i.e. no upper limit on what goes into it. Woofers roll off naturally anyway at higher frequencies and so do midranges. Perhaps not the best setup but it keeps the cost down and it can work with the right drivers.

If the mid or tweeter is too hot after recapping, you could always add an L-pad.

 

[gdmoore28]

Almost certain that the tweets are a later addition. Bet it was originally a two way - woofer and horn.

GeeDeeEmm

 

[toxcrusadr]

Hmm, it might be easy to confirm that by looking at wiring, fit and finish of that cone, and the crossover schematic.