I later upgraded to a Golden Tube Audio SE-40. At 1,000 Hz, the amplifier clipped at 760 watts into the 9.5-ohm impedance of the 61/2-inch woofer. $100.00 1 bid The only significant departure from flatness was a slight bump between 1,000 and 2,000 Hz, apparently in the output of the 6-1/2-inch bass/midrange driver near its upper frequency limit, with an amplitude about 2.5 dB above the average response in that frequency range. Both drivers are heavily damped, with Q ratings of about 0.25. In addition, phase shifts can be very large in the vicinity of the crossover frequency when a large number of reactive elements (capacitors and inductors) are used. I know there is a God, for I would not have these if there wasnt. I drove the Slopes with a modest NAD amp until 5 years later I brought home a Dynaco ST-70 and found out what they could really do - wow! Potential for sounding even better (I believe) but...I'll settle for what I can afford to hear, It's strength can be its weakness...very revealing. Does anyone know how I can replace it? I bought a set of JSE Infinite Slope Model 2 speakers off Ebay. If you manage to get a pair, keep in mind that these may be a bit fussy about what drives them (my present equipment: Musical Fidelity A3CR amp, Bryston BP-20 preamp, Linn Genki CD player, Audioquest Gibralter speaker cables, Audioquest Vampire interconnects (will be upgrading to Jaguar hopefully), Audioquest and Kimber Kable power cords. The Hi's are up there, and the bottom end is way down low in the darkeness. $249.95 + shipping . The Infinite Slope Model 1 however, is a more “technically advance” speaker of the two. Because of the manner in which the outputs of the drivers combine, it was not practical to combine their distortion readings, but the two curves were plotted as essentially parallel traces, with distortion readings in the range of 1 to 2 percent from 300 down to 50 Hz, increasing slowly in the lowest bass to 5 percent at 25 Hz. Thanks. magneplanar magnepan speakers. Those speakers disappear in a beautiful wall of sound I never experienced before. Its first minimum above that peak was 6 ohms at 110 Hz. The most obvious one is suggested by the term "infinite slope," which implies the use of steep crossover filters. I'm powering these things with all Adcom. 7 has only five components in its crossover filter 130—three capacitors 132 … The speakers weigh 125lbs each. I bought a set of JSE Infinite Slope Model 2 speakers off Ebay. Two woofers, of different sizes, operate in a sealed space. Speaker weighs … Being a Musician, I had to know if they worked so I figured $20 wouldnt kill me to find out. Musically very satisfying. In 1989 these JSE 1.8 speakers were $2300 retail which I paid 1500 as demos in july 1990. I believe most if not all of the drivers were Dynaudio. I used these as my primary speakers until they were replaced in 2000 by the Silverline Sonatina's which I paid $3800. The Slopes have been stored for a number of years but are currently seeing duty in my home theatre. Easy to obtain not just window shaking volumes but the actual brick exterior, with clarity, if youare in to that as sometimes I am. These measurements confirm the validity of the speaker's 8-ohm impedance rating. I love these speakers. I am currently using a yamaha m4.If these model 2s with the 5 drivers ever are available do not hesitate you will be exttremely pleased and never need to upgrade. The averaged room-response curve of the JSE Model 1 speakers, measured on the axis of one cabinet and about 30 degrees off the axis of the other, was remarkably smooth and free of the usual amplitude irregularities caused by a room's standing waves. I'm the original owner of the Infinite Slope Model 1's in piano black and red grilles. Messages: 1,632. If you can get your hands on em.....enjoy man! I use B&K ST-202 amplifiers bi-amped, which these speakers need all the power they can get (I have 300 watts per channel into them and sometimes ask for more). What a beautiful sound! The JSE Infinite Slope Model 1 speakers outwardly resemble many other speaker systems but embody two unique design features. The Slopes have been stored for a number of years but are currently seeing duty in my home theatre. These speakers from what I have been able to find on the web are close to 20 yrs old. These things weighed a ton and I did not want to be bothered like most of the people at the auction. Greater base extension but don't perform the disappearing act of the Sonatinas. Bi-wire/Bi-amp capable. Got off the truck and into the studio, hooked them up to your basic #10 cable straight out of the amp that powers sound rack. I installed Jantzen tweeters. The 8-inch woofer's output peaked at 90 Hz and fell off at 6 dB per octave above that frequency. The amp is an old GFA-555. Our FFT frequency-response measurements confirmed most of the results of the room measurements, including the smoothness of the low and middle frequencies and a tweeter response that was flat within 6 dB overall from 2,000 to 18,000 Hz. Pushing them with my smakk Hafler TA1600 they seem to be setttling in right at home with the rest of my racked gear. The 8-inch low-bass driver is just below the center of the panel, with the 6-1/2-inch mid-bass/ midrange driver above it. black lacquor ( or however you spell it) there called the JSE infnite Slope and ther about 4' tall. I'm willing to bet I still haven't heard their full potential. At higher frequencies, we were unable to drive the speaker into obvious distortion with the available amplifier power. We felt no need for such alteration, but experiments left no doubt that it was a practical procedure-unlike the usual attempts to correct deficiencies in a speaker's sound by similar means, which hardly ever works! Sparkling clear on some CD's (and you discover which CD's are the better quality...some of my favorites aren't so great after all, and some that I never cared to listen to are becoming my new favorites). Sealed enclosure. Compared to the Silverlines the Slopes hold up pretty well. Page 1 of 2 1 2 Next > Vistance Super Member. You wont be dissapointed! Tweeter on one is shot. Very heavy 110 pounds each, with a black laquer finish even under the speaker where most speaker manufacturers could skimp on. Near the top of the speakerboard is the 1-inch dome tweeter, which operates above 2,000 Hz. JS Engineering Infinite Slope Floorstanding Speakers . They are also capable of a warmth and depth at very very low levels.I have compared these to psb gold i Mirage 1090 bi polar as well as variou speakers by energy ditton paradigm yamaha and kef.These infinite slopes model 2 with 5 drivers always come out on top.They are big but so easy to move with the rollers.I have amps on top of each makes for easy access and hook up. I recommend bi-amping these speakers since I had only one amp to them, and the speakers distort badly with high bass passages. Can handle TONS of power and at LOW volume the bass still shakes the floor so low listening is excellent. Price: $969 per pair. The woofer curve spliced easily to the room curve, yielding a composite frequency response that varied only ± 3 dB from 56 to 20,000 Hz. Discussion in 'Speakers' started by Vistance, Nov 29, 2010. I'm the original owner of the Infinite Slope Model 1's in piano black and red grilles. carreview.com | The result is a uniform overall amplitude and phase characteristic said to be a good approximation to that of an ideal all-pole, minimum-phase transfer function. Group-delay measurements also underscored the effectiveness of the Model 1's crossover system, with a 0.2-millisecond overall variation from 3,000 to 22,000 Hz. Each speaker weighs about 55 pounds. DESCRIPTION 3 way floor standing design using 2 10" woofers, 6.5" midrange and 1" tweeter. photographyreview.com A conventional crossover network becomes complex (and costly) when its slope exceeds the usual 6 or 12 dB per octave. I purchased these in 1986 for $920. Cool thing was...the guy selling them lived right down the street. The absence of artificial midbass coloration was partially responsible for our initial reaction, since the voices of fm station announcers were reproduced without the annoying heaviness that we find objectionable in so many speakers. The JSE Model 1 is recommended for use with amplifiers rated to deliver from 20 to 300 watts into 8-ohm loads. Its nominal impedance is 8 ohms, with a 5-ohm minimum.
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