Im Stumped, Sensitivity

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Ravendarat

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Posted: August 14, 2006 at 6:18 PM / IP Logged

Hypothetical question here. If a speaker has a sensitivity of 92 db at 1 watt, then how loud will it play at .25 watts and what is the math used for the answer. Its a question on a test of mine and I dont get it

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stevdart

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Posted: August 14, 2006 at 6:40 PM / IP Logged

Doubling of power = +3 db. Halving of power = -3 db. That is the math. If 1 watt makes 92 db, then half the power, or 1/2 watt, would make 89 db. Half of that, or 1/4 watt (.25 watt), would make 86 db.

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Ravendarat

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Posted: August 14, 2006 at 6:55 PM / IP Logged

Simple and effective. Thanks alot man, for some reason I couldnt wrap my brain around the obvious today

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

stevdart

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Posted: August 14, 2006 at 7:06 PM / IP Logged

There might be a formula you could use for this but I can't think of how it would be written. Anyway, glad to help.

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DYohn

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Posted: August 15, 2006 at 7:35 AM / IP Logged

Just remember that you are talking about simple loudspeaker sensitivity, not the efficiency or SPL output of a system. The actual SPL output will be determined by sensitivity AND by the enclosure, installation, etc and will almost always be different from pure sensitivity calculations. I wrote a long post about this sometime ago...

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Ravendarat

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Posted: August 15, 2006 at 11:14 AM / IP Logged

Ya this was simply a question on a stupid test. I couldnt seem to come up with the simple math for it.

double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer

NZNick

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Joined: June 08, 2005

Location: New Zealand

Posted: August 18, 2006 at 2:32 AM / IP Logged

sorry about stealing the post but if i had a cerwin vego stoker sub thats 2000watts rms and 86db sensitive and a a jbl sub that 96db sensitive thats 1200watts rms and put the rms into each one with their optimum enclosure which one would be louder

kfr01

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Posted: August 18, 2006 at 10:15 AM / IP Logged

Using just those numbers, the JBL.

Please note, however, that RMS numbers are usually just thermal power ratings of a subwoofer.

Mechanical (excursion) limits of a subwoofer will often limit SPL before the RMS number is met.

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Im Stumped, Sensitivity

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