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Infinite Slope .5 speakers - does anyone have promo material or any specs on this speaker?

I have been a long time Infinite Slope owner (multiple pairs of .6, Model 1, Model 2) and thought I knew all of the brand’s offerings from back in the day (they made a Model 4 I never owned plus various versions of their primary speakers), but stumbled onto a pair of speakers from them that are unknown to me. A previous post a year or so ago on a forum led me to believe these are .5 speakers (which I also found listed in the Audio Blue Book) but I have been unable to find only any kind of promo ads for this speakers, any specs, etc. Google searches don’t even return any images.

I know the company for a short time also made a home theater setup but this doesn't appear to match with those either.

These speakers are rear ported, about 11" side and 18" high. 9" deep. They are very heavy and don’t have the usual Infinite Slope label on the back.

Anyone out there have any of this information in their files someplace? See photo of the speaker. I have to also say that these things are very highly resolving and in certain ways I like them as much or more as any of the other Slope models I have owned. Now I just need to find a spot in one of my systems for them to live permanently.


Infinite Slope .5 speakers
 

larryincmh
elliottbnewcombjr
5,904 posts
 

Anyone who has ever heard Richard Modafferi's Infinite Slope Crossover, in either JSE or Joseph Audio speakers will never forget it. 

The Bass Shift he uses in the Model 2's I owned combined with the Infinite Slope 100db/octave crossover is very hard to part with.

Since 1973 I have had my current Electrovoice Horns and 15" woofer, now in Rosewood Enclosure. I went to audio shows in NYC for many years, monstrosity after monstrosity in too small rooms, never really wanted anything I heard until I heard the JSE Model 2's: I knew instantly, I wanted/got/had them for years, used McIntosh SS MC2250 to drive them for many years.

Went back to tube pre, tube amp, these horns/15" woofers. My friend has my Model 2's, restored, I get to listen to them in the Firehouse he lives in.

https://www.audiogon.com/systems/11418

https://www.audiogon.com/systems/9511

pryso
1,984 posts
 

No help for the OP's request, but this jogged my audio history memory.

Sometime in the 1980s I saw an early review of the JSE Infinite Slope speakers.  My favorite local dealer requested a model to evaluate and I bought that.  I'm quite sure it was the 1.8.

I matched it with an Eagle 2 stereo amp and conrad-johnson PV5 preamp.  It was a wonderful combination and only later did I realize it was one of the most musically satisfying systems I've owned.

elliottbnewcombjr
5,904 posts
 

any guess about these?

jse tweeter and two 8"?

 

I'm close enough to pick them up, what are they?????

larryincmh OP
83 posts
 

@elliottbnewcombjr these appear to be some hand made speakers using Infinite Slope components. Not sure they are anything the factory put out unless they are a one-off. If this is the auction on ebay in NY (photos look the same) to me they are way overpriced. I have been lucky to get a couple hundred bucks for any Model 1 or Model 2’s I have ever tried to sell. Two years ago I bought two pair of .6 and one pair of Model 1 from a guy for $350 all in.

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