Is anyone familiar with Infinity Slope brand speakers?

I have a pair of speakers that I inherited from my father when he passed away. From what I can tell, the brand is 'Infinity Slope'. He would have originally purchased them in the late 80's to early 90's. I did a quick blue book look-up on them and came up with 0 hits.

Some rough specs:

1. They are about 5 feet tall - floor standing on casters
2. They appear to have 2 tweeters, 1 mid-ranger driver, and 2 woofers

If anyone has some insight, I'm all ears. Thanks in advance.  
Check out Infinite Slope.  There's a lot out there.  
They look pretty nice. 
Do a google search of "JSE Infinite Slope Speakers" and you will find a lot of information about this defunct brand.
My memory of this is that JSE used, without license, the Joseph Audio "infinite slope" crossover technology. There was even some weird stuff about JSE getting a patent, based on re-wording of the crossover slopes ( per decade vs. per octave).

Joseph Audio is still around however and has quite a following.




JSE was around a long time before Joseph Audio, and I don't know the legalities of it, but I think Joseph audio was a later spin-off of JSE. I'm not sure how Jeff was related to the original company. 


It is QUITE possible I have the brands all mixed up. For all I know JSE became JA.

I do remember something like this occured, but no longer remember who the usurper was.


John Sollecito was the engineer and designer of the JSE line of speakers. He has been building speakers since the late 70's with Clarke Systems. His current company is Source Technologies great speakers at a great price. I've owned speakers from all three companies never been disappointed.  
roxy54 is correct, Joseph Audio obtained the rights to produce the JSE designs after the latter went out of business.  The infinite slope concept for the crossovers was originated by Richard Modafferi, an engineer with McIntosh.  The idea was to minimize overhang between the drivers to increase clarity.
You can call John with any questions about your speakers or replacement drivers at 860-918-3088. He's a great guy always happy to help.
Thanks to all for the responses. I did have a type-o in the initial thread. They are in fact Infiinite Slope speakers and not "infinity" slope. Sorry for the confusion. Thanks to chayro and others for keeping me honest.
All correct...

Richard Moddaferi, of McIntosh fame, patented the Infinite Slope crossover back in the late 80s.  John Solecito championed the design with his JSE Infinite Slope Line.  JSE went under in the early 90s.  The aforementioned Jeff Joseph appears to be the lone wolf implementing it these days.  For what it's worth, Ray Kimber also has a unique and interesting (Bud Fried, the cable hater, of all people, was sort of an inspiration to Ray) patented crossover for license, but I don't know if anyone's employing it.

Sounds like you either have the JSE Model 2 or 4. If you send me a picture, I could perhaps remember.  The entire line was a very nice / good sounding lot, and different than you encounter today.  It hearkens back to the 80s (and 70s?).  Definitely on the relaxed and luxurious sounding, if blunting the transients and detail in the absolute.  That's a reflection of the crossover, which points to another current thread where I mentioned the importance of same, but got little traction out of it.  People don't realize to what extent sonics reflect the crossover; it's easy to get lost in the sexiness of drivers and cabinetry.  Keeping your loudspeakers on the casters, or installing spikes, as opposed to removing them, and siting them directly on the floor, will keep them as sharply focused as they can, and mitigate their flaws to the greatest degree.  At this point, the value they provide sonically far outstrips their monetary value in the market.  If you like them, hold on to them for a long time
When looking at your speakers from the front, if the cabinet is rectangle and the front side edge are sharp corners, it is the Model 2. If the front side edges are beveled, it is the 2A.
If from the front from side to side , the bottom of the cabinets are obviously wider than the top, (sloping inward like the letter "A"), you have the Model 4...and I'm jealous.
I have a JSE story....In 1987, after 2 years of searching for the best speaker/amp combo I could afford, I bought a set of JSE Model 2's and a Soundstream DA-1 amp (before it was THX certified). It's all personal taste, but for the truer amplification, I chose the DA-1 over the Adcom GFA-555, which I thought had a boosted bass. Fun Fact 1: The salesman at Harvey Electronics in Paramus NJ that sold me the JSE speakers and demo'd the DA-1 was Jeff Joseph, who years later, after John Sollecito closed JSE, licensed the Infinite Slope technology and started Joseph Audio. I preferred the extended bass range of the JSE Model 4, but couldn't justify the increased cost. Fun Fact 2: The List Price of the JSE speaker line coincided with the model numbers. therefore, the Model 4 was priced at $4,000.

In 1992, the oak veneer of the Model 2's began to lift/bubble. I called JSE and spoke directly with John Sollecito. He was extremely supportive! However, instead of fixing the Model 2 cabinets I had, he offered a more expedient solution that I happily accepted. He sent 2 technicians in a van to my house with an upgrade replacement to Model 2A's in gloss black. The 2A had the upgraded super tweeter and rounded cabinet edge for smoother high end dispersion. The 2A grille covers the full front, not like the slanted cover of the 2.

In 2003, I called John Sollicito again and talked briefly about Source Technologies and the old JSE line. I mentioned how happy I was with the Model 2A and mentioned that originally, I thought the bass of the Model 4 was noticeably better, but I didn't think they were $1,500 better. Fun Fact 3: John laughed and agreed. He said when originally designed, he needed to price the Model 2 performance competitively, so he didn't use the best woofers available at the time. The Model 4 was the no compromise speaker with a larger volume cabinet. To enhance my system bass, I went with his suggestion of what would best match/compliment my 2A's. At the time, it was the Source Technology XLS 12" 450 watt amplified passive radiator subwoofer. It has a very sold bass and extends the frequency response down to 18hz. He gave me a great deal and I'm very pleased with this unit.

In 2012, the 2A woofer foam surrounds were disintegrating, so I gave John a call. He remembered me. We discussed the options and he suggested upgrading the woofers and replacing the aging capacitors of the crossovers. I and a friend who has the Model 2 each bought an upgrade kit. It came will detailed instructions and was easy to install. The only small issue was that the new woofers protruded just a bit more from the cabinet surface, so I shimmed the cloth cover frame a bit. Again, I'm very pleased and haven't had any issues since.
Hello everyone. This post is a bit old but perhaps some of you are still monitoring it. I acquired a pair of Infinite Slope speakers yesterday that are a totally unknown model from what I can tell. They are not .6s, not Model 1 or Model 2 and in fact are about a third the size of the .6 speakers (I have owned or still own all those models).  These speakers are 18" high and 11" across.

The drivers are definitely Infinite Slope issue, the cabinet construction and rounding of the corners matches my Model 2A speakers. Other than the badge on the front no other identifying marks. I will try to post a picture of two, and if anyone has any thoughts on it that would be appreciated. I understand that JSE did some one-off speakers from time to time that were not well documented.
John Sollecito from JSE infinite Slope fame is known as JS Speaker Technology and a Partner in Next Level Acoustics where all current speakers are being engineered and produced.

The best speakers I've ever heard in a home system were owned by my dentist (who owned a large 50's style California Ranch and had his practice on his lower level)  ....... A pair of "Infinite Slope" speakers that were as high and almost as wide as a refrigerator...... I think he paid $14,000 for them (in 1985 Dollars) and bought them from the famous "Lyric Audio" in NYC.( !!!!

I quite well understand the  value of high order crossover slopes.  My tri-amplified DIY horn speakers use DEQX managed 96 dB/octave slopes for all crossovers.  The result is good.