Rule of dBs
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Bronze Member Username: Alexv305Tavernier, FL USA Post Number: 82 Registered: Oct-05 | I am having trouble understanding the rule of decibels. If I have a 2000w RMS subwoofer and I feed it 1000w RMS, then it wouldn't be a whole lot louder if I fed it 2000w RMS. It would only be +3dB louder. What about powering teo subwoofers? Both handle 750w RMS. Would they be almost as loud with only half the power? Can someone explain this to me? |
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NoLimitSoldier Unregistered guest | personaly i think that the teo's would be louder, because you'd be gettin 2 over 1 with the one 2000 RMS sub, but it mainly depends on the type of subs your using... and the ohms and all that, so a little more information would get you more answers.... |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 1690 Registered: Mar-04 | theoretically, if you give 1 sub 500wrms, then give it 1000wrms, it will be 3dB louder. (double the power = +3dB) also, if you give 1 sub 500w, then give 2 of the same subs 250wrms each...it will be 3dB louder. (double the surface area = +3db) |
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Gold Member Username: Mikechec9Http://www.cardomain.c... Post Number: 1723 Registered: May-05 | as a reference, 3dB is the amount of gain necessary to perceive an audible difference (of course, that's arguable. but then so is the "sq" of an amp). |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 1693 Registered: Mar-04 | wait...isnt the reference for a perceived audible difference +/- 1db? i know that there was VERY noticable difference when i jumped from 145.2db and 148.0dB in my truck. oh and f.y.i. amps do have SQ  (lol) |
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Gold Member Username: Jonathan_fGA USA Post Number: 4999 Registered: May-04 | 1db is considered to be the lowest noticeable change in volume 3db is a noticeable difference, like when you can't quite hear the words on a TV show, you'll typically turn it up something like 3db. Double the power is a 3db change. 2000W RMS will only net a 3db gain over 1000W RMS, if that. At a level of 2000W RMS, you may not even get a full 3db gain due to the limitations of the subwoofer and the environment it is in. F.Y.I.: Amps shouldn't sound like anything at all |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 1698 Registered: Mar-04 | "F.Y.I.: Amps shouldn't sound like anything at all " oh yea they can!!! (if you wire them gnd to + and + to gnd) ***pop, sizzle, hiss*** ---smoke--- |
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Silver Member Username: Robert_dMIA, FL USA Post Number: 403 Registered: Sep-05 | lol marshall i always though ever 6 db the volume doubles |
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Silver Member Username: MixneffectOrangevale, Ca. USA Post Number: 625 Registered: Apr-05 | http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html |
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Gold Member Username: SouthernrebelMonroe, Louisiana USA Post Number: 1699 Registered: Mar-04 | http://www.bcae1.com/decibel.htm |
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Silver Member Username: FandimReno, Nevada United State... Post Number: 475 Registered: Jun-05 | Also, remember... The differnce between 90 dB, and 91 dB, is MUCH smaller, than the difference between 150db, and 151dB...so a rule of thumb about the average percievable difference in volume varies greatly. |
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