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  1. 02-06-2013 04:58 PM #1
    Ocezam
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    Default LSi15 Efficiency Rating

    Does anybody here know under what circumstances Polk measures their speakers efficiency? My LSi's (15's) are rated at 88db according to Polk. Is that measured in an anechoic chamber or a "typical room"? Most mfg state how it's measured. I'm unable to confirm either way.
    Thanks...
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  2. 02-06-2013 05:05 PM #2
    steveinaz
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    Anechoic, with the mic at 1 mtr. I pretty certain all sensitivity measurements are done this way.

    Source: C.E.C. CD-3300 CD Transport
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  3. 02-06-2013 06:29 PM #3
    F1nut
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    Most mfg state how it's measured.
    No, they don't.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
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  4. 02-06-2013 10:22 PM #4
    tonyb
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    Just out of curiousity, why is this important to you ?
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  5. 02-06-2013 10:58 PM #5
    Face
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    Should be the same no matter where it's measured, room, chamber, etc...
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  6. 02-09-2013 04:50 PM #6
    Ocezam
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    Quote Originally Posted by F1nut View Post
    No, they don't.
    Yeah you're probably right, I wish they would.


    Quote Originally Posted by tonyb View Post
    Just out of curiousity, why is this important to you ?
    Curiosity mostly


    Quote Originally Posted by Face View Post
    Should be the same no matter where it's measured, room, chamber, etc...
    No it's not the same. Some manufacturers will give both ratings. An "in room" measurement will give a rating four or five points higher than in an anechoic chamber because of room reflections.
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  7. 02-09-2013 07:12 PM #7
    Face
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    In room will only boost low frequencies, not the entire speaker. A speaker rated -3dB @ 30hz in room will be -3dB @ 40+ in an anechoic chamber. Which leads me to, many times "in room" measurements are very generous and makes me wonder if they measured the speaker in a closet.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  8. 02-10-2013 10:10 AM #8
    Ocezam
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    Quote Originally Posted by Face View Post
    [SIZE=1]In room will only boost low frequencies, not the entire speaker. A speaker rated -3dB @ 30hz in room will be -3dB @ 40+ in an anechoic chamber. Which leads me to, many times "in room" measurements are very generous and makes me wonder if they measured the speaker in a closet.
    Funny. And your right. If you don't know what the "room" that was used is like, the results are still relatively useless.

    Anyway, thanks for the replies.
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