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Jeff Permanian

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Jeff Permanian last won the day on November 1 2017

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  1. JTR Noesis 215RT Measurements Discussion

    100% of home audio speaker go into homes. Advanced room modeling software can pretty accurately predict frequency response of a speaker in room. While all rooms are different, the speaker placement is usually similar, 3-5 feet from the side walls and 1-3 feet from the front wall. Averaging the predicted in room responses in a variety `of different rooms will produce a target curve. However, this isn't as easy as is sounds because the Noesis 215RT isn't a simply subwoofer. The Noesis 215RT woofers are up in the air and receive very little boundary gain while the port is on the floor (1/2 space) and producing very large frequencies which are reinforced by the front and side walls (1/8 space). There isn't an ideal amount of boost because it is personal preference, depends on subwoofer's ability and varies with content. With movies, boosting the very bottomend is fun but then when you play music, boosting 40-120hz will give you more chest thump. Most people end up elevating from 80hz and below with the ramp starting in the 120-160hz range. Higher than that will start to hurting intelligibility.
  2. JTR Noesis 215RT Measurements Discussion

  3. JTR Noesis 215RT Measurements Discussion

  4. JTR Noesis 215RT Measurements Discussion

    The lowend of the Noesis 215RT was carefully designed for a flat response in room. The half space, out door response doesn't give a good indication of the in room response. The Noesis 215RT was very difficult to design because of the horn's directivity transition to the direct radiating woofers and then the spatial and room gain. The attached measurement is a Noesis 215RT, 1ft from the front wall and 3ft from the side wall, in a large, open basement, on a concrete floor.
  5. JTR Captivator 4000-ULF discussion

    Our new, shallow Captivator 4000ULF-lp: http://jtrspeakers.com/captivator-4000ulf-lp.html
  6. JTR Speakers Captivator 212Pro Discussion

    A pair of 3" coils can handle as much power as a 6" coil. However, design goal was for max efficiency and output with 1200w (69v) which we need to add to the website (up to 1200w amplification).
  7. JTR Speakers Captivator 212Pro Discussion

    Looking at some comparisons, in the music range (above 45hz):
  8. JTR Speakers Measurements and Discussion

    Showing off dyno charts is one thing but that isn't going to tell anyone how they got those numbers. Popping the hood of a car isn't going to show the cam profile, compression, squish, rod length, fuel map, etc. We don't discuss magnets and steel grades, motor geometry or voicecoil specs. Someone can pull a driver out and get t/s parameters but they won't know how we got there.
  9. JTR Speakers Measurements and Discussion

    For 2017, we increased the Orbit Shifter and Captivator 1400 driver's Xmas to 33mm (from 30mm).
  10. JTR Speakers Measurements and Discussion

    We can't give away all our secrets.
  11. JTR Speakers Measurements and Discussion

    We modified the cabinet to regain the cabinet volume. With the new driver we had to lower the dcr a little to get the efficiency back that was lost from the longer coil. The, in band, zmin is exactly 2.5 ohms which is the minimum the 700asc module will put out full power.
  12. New SVS Ultra 16"

    That's about what I expected. Can't wait for Josh to test the new Cap1400
  13. JTR Speakers Measurements and Discussion

    Yes sir. The celphone audio is horrible so just ignore that.
  14. JTR Speakers Measurements and Discussion

    It was good. People actually came in from NH, FL, NE and other places. We showed off a pair of Captivator 4000ULF is the warehouse and then new Captivator 118HT in the demo room.
  15. JTR Speakers Measurements and Discussion

    We're really excited about the new Captivator 118HT. We're measuring the same output as the 1400 from 50hz and up while still putting out 105db at 16hz, 2m, rms. Hopefully, Josh can test the 118, 1400 and S1 in the spring.