Speaker sensitivy and loudness

Discussion in 'Archived Threads 2001-2004' started by Walt H, Jun 7, 2002.

  1. Walt H

    Walt H Stunt Coordinator

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    I just replaced my mains with a new pair of JBL S38's. These speakers have an 89db sensitivity. What I immediately noticed was that it takes more volume to reach the same loudness level with the S38's than it did with the old speakers I replaced.

    The old speakers were given to me and they had no name on them so I don't know the brand. They (the old speakers) were floor standing with 12" woofers about a 4" midrange and maybe a 2" tweeter. They were "left overs" from a "1970's" component system. (They still work fine BTW...I just wanted to get a smaller pair) I'm guessing that the sensitivity db of these speakers are at least 92db as they played loud at a realtively low volume input level.

    Could it be since the JBL's have a lower sensitivy db which requires greater volume to achieve the same loudness level that this is a factor why the JBL's still remain clear when you pump up the volume (becaue the speaker's loudness level is lower to begin with)?

    For the record, the S38's are excellent speakers IMHO!

    P.S. I see where the JBL S-Center speaker has a 91db sensitivity...perhaps this is to compensate for the lower volume level for dialogue which comes through that center channel?
     
  2. Phil Iturralde

    Phil Iturralde Screenwriter

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    Congrats on your JBL S38 purchase! After a few months of break-in (mostly for the Pure Titanium Tweeter), they will sound even sweeter!!! [​IMG]
    Again, the Sensitivity Rating will be the end result after the S-Center was MCAD designed, built and tested per some Speaker Engineers schematics.
    Remember, REFERENCE Calibrating your HT Setup (Front/Center/Surrounds/Sub) via Video Essentials @ 75 dB (or AVIA @ 80 dB) will equalized the SPL in your HT Room & 'sweet spot'.
    Hope his helps,
    Phil
     
  3. Walt H

    Walt H Stunt Coordinator

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    Thanks for that clear example. I'm running a Yamaha RX-V800 A/V receiver and I noticed with the old speakers I used to set the digital volume level at around 37 now with the JBL's I have to set the digital volume at around 34 which is that 3db difference you showed.
    Thanks for showing me how this works. A guy can learn a lot in this forum. [​IMG]
     

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