JBL NSP-1 speakers vs. Onkyo 494

Discussion in 'Archived Threads 2001-2004' started by Robert Lovejoy, Feb 26, 2002.

  1. Robert Lovejoy

    Robert Lovejoy Stunt Coordinator

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    Based on the glowing reviews I've seen, I ordered the JBL NSP-1 package from J&R. While awaiting delivery, I have continued tos eek information about these speakers, and now am wondering if my Onkyo 494 (honestly rated at 55 watts per channel) has enough power for them.

    I don't listen at reference level, and I do have a powered sub (Mirage PS12-90). One site I uncovered recommended 70 watts per channel due to the N24's relative inefficiency.

    My current system was a timbral nightmare. Left over from the pro-logic days, my rears are little Yamahas, my center is a Mirage, and my fronts are Tannoys. Since we've gotten into DD and DTS, we've become painfully aware of the overall audio mismatch, and the price at J&R was too good to pass up.

    Is anyone else using a 494 or similarly powered receiver with these speakers? I'm just hoping I'll be able to reach a comfortably loud level - no need to rattle the folks next door. Thanks for any input!
     
  2. Phil Iturralde

    Phil Iturralde Screenwriter

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    Robert, you should be fine, since you have have a powered sub (Mirage PS12-90)!
    An easy and simple way to calculate your systems SPL capability, is to use the sensitivity rating of your speakers and create a Watt vs. SPL chart (see below).
    1: It takes at least 3 dB of SPL increase for human hearing to perceive an increase of loudness.
    2: In terms of Power output Vs SPL, to achieve 3 dB increase of SPL requires doubling (i.e. x2) the REC/AMP Power Wattage.
    JBL N24 Speakers Rated @ 86 dB Sensitivity (1W @ 1 M)
    ===============
    Watts--SPL (dB)
    1------86
    2------89
    4------92
    8------95
    16-----98
    32-----101
     
  3. Robert Lovejoy

    Robert Lovejoy Stunt Coordinator

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    Thanks Phil! It was your site which recommended the 70 watts per channel for the NSP-1s, but I suspect as you mentioned the Onkyo will drive them adequately for my needs.

    The Mirage will be replaced later this year with one of the new SVS PCi subs.

    I am really looking forward to finally having timbre-matched speakers. One of the reviews I found mentioned that wall-mounting increases bass response, but the front speakers should not be located behind the center channel speaker. Might be worth some experimenting.

    What to do with the Tannoys? I suspect I can either rig up a bedroom system or use them as alternate 2 channel music speakers if the Onkyo still passes the bass to the sub for the "B" speakers.

    Thanks again for the good words!
     
  4. Kenny Booth

    Kenny Booth Stunt Coordinator

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    About 6 months ago I bought the NSP1 package. I'm running thru a Denon 2801 (90 WPC). These are good speakers and at first I was happy. You can go thru the numbers and it all looks great.----PROVIDED you're sitting right in front of the speakers and the amps turned up high which is where you'll be watching movies. But music??

    I can only tell you what I found using these speakers.

    1. I can not get the real kick-ass rock & roll sound from these speakers.

    2. These speakers seem to cast a narrow sound stage and the SPL drops off quickly as you move a few feet away from your easy chair. Not room filling sound.

    3. For movies they are great

    4. For 300 bucks you can't buy 5 better speakers.

    All said, I have replaced my two mains with a little larger bookshelf speakers and I'm happy.

    Replacing the two front N24's with N26's(or ?) may work fine and it's only a few bucks more.
     
  5. Robert Lovejoy

    Robert Lovejoy Stunt Coordinator

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    Kenny, are you running them with a sub? Most of what I've read says they do just OK on music, much better with a powered sub. But the JBL "Matched" subs are no match for a more high-end (or should I say "low end"?) sub, and I'm hoping that will do the trick. The room itself has great natural acoustics, too.
     
  6. Kenny Booth

    Kenny Booth Stunt Coordinator

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    Yes I'm running a PB10 JBL sub. It's OK but just OK.

    I ran the NSP1 without a sub for a while--Even tho the PB10 is not all that good it did really warm-up the sound.

    Enjoy the NSP1 system, even if you deceide to change the mains you're not out much.
     
  7. Doug Lachman

    Doug Lachman Auditioning

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    I have this same arrangement with the SAWM-40 sub and it is great. I too thought it was going to be underpowered with the Onkyo 494, but calibrating it with an SPL meter made all the difference.
     
  8. Robert Lovejoy

    Robert Lovejoy Stunt Coordinator

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    Doug, is there a particular procedure for calibration archived somewhere I could look up? I guess I was planning to use the receiver's built-in test tones. I suspect you are talking about a far more comprehensive procedure.
     
  9. Phil Iturralde

    Phil Iturralde Screenwriter

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  10. Doug Lachman

    Doug Lachman Auditioning

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    Robert - While the VE or Avia would be the preferred software, I used the THX Optimode that was on my X-Men DVD (also found on other Fox Studio DVDs) and used the techniques Phil has on his site. I found this to be adequate for my use and it made a big difference after I finished.
     
  11. Phil Iturralde

    Phil Iturralde Screenwriter

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    FYI: Don't hesitate to utilize your Internal AV Receiver's test tones! Here's why . . . a couple of quotes from last years thread (date? didn't copy it) quoting HTF member Roger Dressler from Dolby Labs (Director of Technology Strategy) responding . . . (entire quote copied without modification)
     

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