traksta15
jtomsic
5,000+ posts
CarAudio.com Veteran
i would get the two 10s more cone area
supa_c
5,000+ posts
Abministrator
heh no contest
1 15.
2 10's wont even come close to the output of 1 15.
And i would know !
1 15.
2 10's wont even come close to the output of 1 15.
And i would know !
Actually, the single 15 has more cone area...........but you'd need to look at overall displacement.
Is this correct?
Area of a square is length x's width
Area of a circle is pie or 3.14 x's radius squared
Area of a square is length x's width
Area of a circle is pie or 3.14 x's radius squared
Yeah.....but those don't really mean anything when determining cone area. For cone area, the only sure way to tell is to look at "Sd" in the T/S params. For the Kickers we are talking about, the 15" has a Sd of .1056, while the two 10s combined only have a cone area of .0878 (.0439 x 2).
And even then cone area doesn't mean anything by itself, you need to take excursion into consideration in order to determine total displacement for each driver or each pair of drivers.
So "sd" is the actual area of the cone in other words, just the cone and not the foam surround? Then you would use a formula to incorporate one way liner excursion and you would have a good idea of how much air a particular driver will push.
The general standard is to include half of the surround in the measurement.
Sd x Xmax = displacement
One last question:
All things being equal would there be a difference is SPL between these two drivers. One is driven with 500 watts and the other with 1000.
12 inch sub 500 watts max RMS and 20 mm excursion
vs
12 inch sub 1000 watts max RMS and 20 mm excursion
and lets say that they are from the same company but the second one has a tighter suspension and larger motor structure to enable it to handle twice as many watts. They both push the same amount of air but one sub takes twice as much power to do this.
All things being equal would there be a difference is SPL between these two drivers. One is driven with 500 watts and the other with 1000.
12 inch sub 500 watts max RMS and 20 mm excursion
vs
12 inch sub 1000 watts max RMS and 20 mm excursion
and lets say that they are from the same company but the second one has a tighter suspension and larger motor structure to enable it to handle twice as many watts. They both push the same amount of air but one sub takes twice as much power to do this.
im gonna say it comes down to what car u have. For smaller hatch backs, the 10's will be better, but if u have a suv, the 15' will work better. yes i know this cause i tried 8's to 15' in differen't boxes in my hatch, and the smaller ones seem to work the best
Well, let's answer a question with a question //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Does the power going into a sub make SPL, or does the air moved by the sub make the SPL?? So, if the amount of air moved by two subs is the same, but the power is different, what do you think the outcome will be given the answer to the first question??
(Assume EVERYTHING is equal except the amount of power going to the subs [since I assumed that what your question was, correct?].)
I would assume that it would be the same unless one cone was heavier and moved faster and they extra watts were needed to move this heavier cone. But since we were talking about the same cone then it would not be heavier but possibly could move faster??? Does the speed at which a cone travels have anything to do with SPL.
That's called the "frequency" //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif For 30hz, a cone can not move back and forth more than 30 times per second or it's not really 30hz. If it moves any "faster" or "slower" than it won't move back and forth 30 times per second, and it won't really be playing a 30hz tone.
Good point. So lets go back to the original question, does the air moved make the spl or the power going in? I think that it is the air moved and watts are just a way to get the air going.
So if a cone moved back and forth 40 times in a second it would be a 40 hz. wave.
The time frame to determine a freq is one second? So if you played a 40 hz wave consistently over three seconds the cone will have gone back and forth 120 times.
So if a cone moved back and forth 40 times in a second it would be a 40 hz. wave.
The time frame to determine a freq is one second? So if you played a 40 hz wave consistently over three seconds the cone will have gone back and forth 120 times.
audioholic
5,000+ posts
not a moderator
SPL is Sound Pressure Level. So in effect, its a measurement of how much your speakers are pressurizing the air molecules inside your car.
Power is only one part of the overall output equation. For example, driver efficiency and driver/enclosure efficiency affect the power input part of the equation. There is also a phenomenon called power compression that basically means as you increase power input to the driver, efficiency drops slightly (it will not use a second 500 watts as efficiently as it did the first 500 watts) due to power loss in the form of heat.
Yes, a 40hz note played for exactly 3 seconds would yield 120 cone cycles.
As for which would be louder, the two 10's or the one 15, cone area is relatively close, and if we are talking about the same model subs, xmax should remain the same. In this case two 10's will have the advantage of allowing more power input than the 15 due to two motors to allow for heat dissipation. Power compression will be less on the two 10's. I dont know.. the 15 would probably still be louder, but not definitely.
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