Im Stumped, Sensitivity
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=81623
Printed Date: May 11, 2025 at 5:46 PM
Topic: Im Stumped, Sensitivity
Posted By: Ravendarat
Subject: Im Stumped, Sensitivity
Date Posted: August 14, 2006 at 6:18 PM
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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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Replies:
Posted By: stevdart
Date Posted: August 14, 2006 at 6:40 PM
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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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: Ravendarat
Date Posted: August 14, 2006 at 6:55 PM
Simple and effective. Thanks alot man, for some reason I couldnt wrap my brain around the obvious today
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: stevdart
Date Posted: August 14, 2006 at 7:06 PM
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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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.
Posted By: DYohn
Date Posted: August 15, 2006 at 7:35 AM
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... ------------- Support the12volt.com
Posted By: Ravendarat
Date Posted: August 15, 2006 at 11:14 AM
Ya this was simply a question on a stupid test. I couldnt seem to come up with the simple math for it.
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double-secret reverse-osmosis speaker-cone-induced high-level interference distortion, Its a killer
Posted By: NZNick
Date Posted: August 18, 2006 at 2:32 AM
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
Posted By: kfr01
Date Posted: August 18, 2006 at 10:15 AM
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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New Project: 2003 Pathfinder
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