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Jeff Permanian

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Everything posted by Jeff Permanian

  1. The RS2 (reference sealed) has replaced the S2 which features all new, ultra low distortion and inductance drivers with improved sound quality and increased midbass.
  2. 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.
  3. http://www.avsforum.com/forum/89-speakers/1165099-official-jtr-speaker-thread-1259.html#post54692882
  4. http://www.avsforum.com/forum/89-speakers/1165099-official-jtr-speaker-thread-1238.html#post52138433
  5. 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.
  6. Our new, shallow Captivator 4000ULF-lp: http://jtrspeakers.com/captivator-4000ulf-lp.html
  7. 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).
  8. Looking at some comparisons, in the music range (above 45hz):
  9. That's about what I expected. Can't wait for Josh to test the new Cap1400
  10. We're trying to see if there is time yet this year for Data-Bass to test some more subwoofers.
  11. So, when are your subwoofers going to be tested?
  12. I don't think bragging is the right word but we are very happy with the results. The OS does have much topend with only one 18" driver however the more complex cabinet offsets most of the costs of a second driver. Actually, the Mariana 24 would have much less output on the bottomend due to the much small enclosure. Plus, the SP1-4000 operates with 110 volt rails. We decided on the 3" coil because of the lower moving mass, lower inductance and increase Xmech.
  13. Data-Bass tested 120v versions of the JTR powered subwoofers. We offer 240V amplifiers are well that can deliver a little more.
  14. I must be looking at a different product:
  15. I'll probably have him redo this one. The dsp settings in that unit was a prototype and measurements do not look like the production units (smoother response, LF adj has more effect and limiter set higher). Burst measurements still ran with other, larger sealed subwoofers.
  16. The lowend response was carefully tuned to give the best in room response. Most of our customers are measuring flat to 17-18hz in room.
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