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Kingjt

Stromberg Carlson identification/info

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Hello!

I've frequently come here for info but finally joined up.

I picked up a pair of Stromberg Carlson speakers recently and was hoping to ID the model and maybe find out some info on them. 

I thought they were RH416s but once I got the grills off it appeared they were not.

They have a 12", a 7" and the single tweeter. On the back there are pots for High & Mid Balance.

Right now one sounds very good and the other doesn't quite have the highs working. I'm hoping it is a simple need of cleaning the pots or possibly changing the crossover caps. I haven't gotten inside to see what the crossovers consist of. 

Any info is appreciated!

Thanks.

Mike

20170916_200845.jpg

20170914_213140.jpg

20170911_185338.jpg

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More Stromberg goodness than you can shake a stick at.

Catalogs down the page, if you haven't already seen this site.

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Hey thanks!

I checked out that page before but was thrown off by the DJVU files. Found an app for those and things are better now.

I'm thinking they may be MSS491s with my measurements off slightly. 

Hopefully Sunday I'll get the backs off and I can take a look at the pots and crossovers.

My biggest problem right now is finding a room they'll fit in.

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2 hours ago, Kingjt said:

Hello!

I've frequently come here for info but finally joined up.

I picked up a pair of Stromberg Carlson speakers recently and was hoping to ID the model and maybe find out some info on them. 

I thought they were RH416s but once I got the grills off it appeared they were not.

They have a 12", a 7" and the single tweeter. On the back there are pots for High & Mid Balance.

Right now one sounds very good and the other doesn't quite have the highs working. I'm hoping it is a simple need of cleaning the pots or possibly changing the crossover caps. I haven't gotten inside to see what the crossovers consist of. 

Any info is appreciated!

Thanks.

Mike

20170916_200845.jpg

 

 

Not the RF-416?

I messed with some RS-406 systems that had the RW-489 woofer... serviceable
but nothing outstanding (my reference is the AR-3a). Here's the crossover:

 

S-C_xo2.JPG

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Looks like the RF416 has two tweeters.

According to the catalog you pointed me to, the MSS491 has a 15" w, an 8" m and a single tweeter. If I measure from the mounting screws then that makes more sense.

I really appreciate the info you've provided!

Thanks.

Mike

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Woofers are measured to the outer edge of the frame, mids and tweets are
measured by cone diameter. Does indeed sound like you have the MSS491.

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Do you know the time frame for these?

 Stromberg Carlson essentially invented what we call today transmission line speakers

but they called them an acoustical labyrinth.  Is there a folded pipe inside the box, and a

port out the back or bottom?

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7 hours ago, Pete B said:

Do you know the time frame for these?

 Stromberg Carlson essentially invented what we call today transmission line speakers

but they called them an acoustical labyrinth.  Is there a folded pipe inside the box, and a

port out the back or bottom?

Hey Pete.

I believe they're from around 1958-1960.

The inside has a rudimentary "maze" of plywood leading to a port on the bottom.

Once I get rolling on fixing these up, I'll need to put some type of grill on the bottom to keep my cat out... if my wife lets me keep them!

I did get inside and determined that the high balance on one was disconnected and hooked up to half a stereo control internally. Turned that up and the highs were good. But mids are a bit off compared to the other speaker. Hoping to get to cleaning the mid balance pot and see if that takes care of the problem. 

They sound pretty good so far.

20170916_172002.jpg

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That is very cool, you might find out that they produce deep, powerful bass.

I can give you some tips if they need some fine tuning.

Plan to re-cap them, they will certainly need it.

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Some Stromberg Carlson info from the 1930s, I shared some of the more technical papers

years ago online but I'm not sure if they are still up:

http://www.antiqueradio.com/Sep06_Schecter_Choose.html

This is what Bose has perfected and re-marketed as the Acoustic Wave products and

Wave Cannon.  I did project work on Acoustic Transmission Lines as a senior project in 

college and interviewed with Bose suggesting that they look into them.

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Bose Acoustimass: 

7353-bose_am6_sub.jpg

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2 hours ago, Pete B said:

That is very cool, you might find out that they produce deep, powerful bass.

I can give you some tips if they need some fine tuning.

Plan to re-cap them, they will certainly need it.

Very nice bass. Pretty well balanced overall but I've only been able to listen in the garage which is not ideal.

Here's a picture of the crossover. I haven't looked inside yet. 

20170917_173547.jpg

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