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Old 19th January 2006, 12:45 PM   #1
croat47 is offline croat47  United States
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Default Infinite Slope?

I am looking for info on some speakers my father bought in teh mid to late 1980's. He sent me this information:

Infinite Slope is on a little plate in the lower left corner on the front. On the back there is a larger plate with limited lifetime warrenty info and inspection data. The model is Infinite Slope. They are(were?) put out by:

I S Engineering Corporation
519 East Middle Turnpike
Manchester, Conn. 06040
(203) 643-2160

Is this now Joseph Audio? The speakers have three drivers and a slanted baffle. I recall somehow that they had casters rather than spikes. I also recall some curious child putting a ping pong ball like dent in the dome of a tweeter...would be nice to replace that.

Thanks for any help!

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Old 19th January 2006, 01:18 PM   #2
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I believe that if it was not put out by Joseph Audio, it was made by license from Joseph Audio, because Infinite Slope is their trademark.

If the company is defunct, (I don't know if it is), you might be able to get some info on them from Joseph Audio. Can't hurt to try.

Have you called that number in Manchester, CT, by the way?

Is that IS engineering corp or JS engineering corp?
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Old 19th January 2006, 01:27 PM   #3
SY is offline SY  United States
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I think the Infinite Slope trademark belongs to Richard Modaffieri (sp?), the inventor of that filter topology. The technology certainly is licensed to Joseph, but I think the trademark is, too. These might be products from another (earlier?) licensee.
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Old 19th January 2006, 01:58 PM   #4
croat47 is offline croat47  United States
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Default Not yet...

I have not called yet.

I recall reading something about Joseph Audio picking up the Infinite Slope technology recently and starting to make these again. Was this the original company?

I will certainly write to JA and try to call the number today.
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Old 19th January 2006, 03:58 PM   #5
croat47 is offline croat47  United States
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Default Got it.


I called Joseph Audio and found out the following:

-My dad mis-typed and the company was JS Engineering, not IS Engineering.

-John Fillipito (spelling?) was the owner of the company and according to the gentleman at Joseph, is still honoring the Lifetime Warranty on the speakers.

-John moved on to run Source Technologies in Manchester, CT. I cuold not find a speaker manufacturer by that name in a quick Google search.

-The 3-driver, slanted baffle model my father has is the Model 1, which has a textile dome tweeter. There was a Model 1.2 that had a metal dome tweeter, but that is less abundant.

-The original list price in the 1980's went from $900 up to $1100.

-If anyone else blows a tweeter, the original part was the Dynaudio D28AF. It is no longer available as a part. Only in the Dynadio speaker you might buy.

If anyone else is looking for info on these durn good sounding speakers, I hope this helps.

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