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Sonographe SL-21 speakers

I am not really asking a question on these speakers, since I may have had the only pair in the whole country. I just want to make a few comments on these fantastic little speakers.

I purchased these speakers by chance, I heard about them and drooled over them in the late 80's, but I could not afford any high end gear at that time.

After spending hours searching up and down on the internet, I couldn't find diddly-squat on these speakers, but there are no shortage of info for the Sonographe SA-120 and the SP-1, even the SG-3 is mentioned quite a bit on the net, that really makes me sick.

Anyway, the SL-21 has very attractive real oak veneer, the front and back are sloped, hence involved some time-align design, but like I said, I could not find anything on them. Even when I called C-J, the guy named Ed who handled vintage C-J equipment couldn't tell me a whole lot about them, at least Sota could tell me quite a bit about the SG-3 for crying out loud.

The SL-21 has very wide soundstage and solid bass for it's size, 6.5" woofer and 1" soft dome tweeter, and a 1" port in the front baffle, they also have very nice midrange. The speakers virtally disappear from the room while playing, that proves these speaker are well designed. During the knuckle test, I heard no cabinet echo or resonance, very solidly built, that tells me they are well damped inside.

If anyone who know about them, please charm in. These may be the only pair that left in the country, and they are not for sale.
sovtek6922
mesch
3,479 posts
 
The Sonograph SG3 turntable was originally produced in Oregon in the early 80s. Was bought out by CJ in 1984 I believe. CJ then started making electronics under the Sonograph name. I did not remember about the speakers.

I own a original Sonograph with a Sumiko MMT tonearm. Purchased in 1983.
notbrian
5 posts
 
As I do. I have bought a couple of belts for it from SOTA, new hinges for the dust cover, and recently cleaned out the bearing after too many years and lubricated it with oil from George Merrill. I can afford his oil if not his turntables!
chaos124
2 posts
 

Does anybody know what the DB rating of the CJ

sl21is I’m looking to purchase a set and I’m running at 6 W per channel tube app so obviously I need a speaker of at least 90 DP or above

I would appreciate any help I can’t seem to find specs on these particular speakers anywhere

thanx chaos124

notbrian
5 posts
 

Hello Chaos. I am attempting to attach a pdf of the CJ Synthesis brochure but I don't think this forum will let me do that. Here is some relevant information: IF the SL-21 morphed into the Synthesis LM-20, sensitivity of the (LM-20) is 90db.

 

From the brochure: LM20 uses a 6.5 inch polypropylene woofer and a 1 inch soft polymer dome tweeter with crossover at 1500 Hz.  Is this similar to the SL-21?

 

 

Good luck.

 
 
 
 
 
 

 

 

Synthesis Speaker Brochure.pdf

chaos124
2 posts
 

I did end up finding some information on them and I made the purchase and I’m so happy I did. They are absolutely beautiful. I’m running them on a 6watt per channel tube amp playing  primarily albums and the sound is absolutely phenomenal!

 

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