LSi15 Efficiency Rating

Ocezam
Ocezam Posts: 52
edited February 2013 in Speakers
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...
"The ear is not a microphone, the brain is not a tape recorder, and measurements are limited in describing subjective quality." Nelson Pass

2 Channel:
XDA-2, Modified Jolida JD502P (2 ea), Polk LSiM705
Theater:
Onkyo TX-NR3009 with 9 active channels, Emotiva XPA-5, MartinLogan Encore TF Center Channel, Polk M70 Mains, M40 Wides, M30 Heights, FXi A4 Surrounds, Custom built 18" sub, Mitsu 73" DLP
Post edited by Ocezam on
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  • steveinaz
    steveinaz Posts: 19,538
    edited February 2013
    Anechoic, with the mic at 1 mtr. I pretty certain all sensitivity measurements are done this way.
    Source: Bluesound Node 2i - Preamp/DAC: Benchmark DAC2 DX - Amp: Parasound Halo A21 - Speakers: MartinLogan Motion 60XTi - Shop Rig: Yamaha A-S501 Integrated - Shop Spkrs: Elac Debut 2.0 B5.2
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  • F1nut
    F1nut Posts: 50,746
    edited February 2013
    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 t-u-r-d by the clean end."

    President of Club Polk

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  • tonyb
    tonyb Posts: 33,005
    edited February 2013
    Just out of curiousity, why is this important to you ?
    HT SYSTEM-
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    Polk Sig. 20's
    Polk FX500 surrounds

    Cables-
    Acoustic zen Satori speaker cables
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    Kitchen

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  • Face
    Face Posts: 14,340
    edited February 2013
    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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  • Ocezam
    Ocezam Posts: 52
    edited February 2013
    F1nut wrote: »
    No, they don't.

    Yeah you're probably right, I wish they would.

    tonyb wrote: »
    Just out of curiousity, why is this important to you ?

    Curiosity mostly

    Face wrote: »
    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.
    "The ear is not a microphone, the brain is not a tape recorder, and measurements are limited in describing subjective quality." Nelson Pass

    2 Channel:
    XDA-2, Modified Jolida JD502P (2 ea), Polk LSiM705
    Theater:
    Onkyo TX-NR3009 with 9 active channels, Emotiva XPA-5, MartinLogan Encore TF Center Channel, Polk M70 Mains, M40 Wides, M30 Heights, FXi A4 Surrounds, Custom built 18" sub, Mitsu 73" DLP
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  • Face
    Face Posts: 14,340
    edited February 2013
    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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  • Ocezam
    Ocezam Posts: 52
    edited February 2013
    Face wrote: »
    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.
    "The ear is not a microphone, the brain is not a tape recorder, and measurements are limited in describing subjective quality." Nelson Pass

    2 Channel:
    XDA-2, Modified Jolida JD502P (2 ea), Polk LSiM705
    Theater:
    Onkyo TX-NR3009 with 9 active channels, Emotiva XPA-5, MartinLogan Encore TF Center Channel, Polk M70 Mains, M40 Wides, M30 Heights, FXi A4 Surrounds, Custom built 18" sub, Mitsu 73" DLP
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