Noob question about DD subs?

[marquisbrah 10+ year member]

Im all confuzzled know. Mindfuck lol

 

[FtheNutHuggers]

The linear displacement of the 2515 is quite a bit over that of the 3510. Now give us maximum dims that allow for an extremely efficient alignment using the 2515 and you've got zero chance to catch up with that 10" driver with a goal of flat response over ANY single octave bandwidth you choose. If you understood what the supercharger does to the driver, you would not want it on anything less than 18" in diameter and definitely not on the 2500 motor, due mainly to the suspension specific to those drivers.

 

[marquisbrah 10+ year member]

The linear displacement of the 2515 is quite a bit over that of the 3510. Now give us maximum dims that allow for an extremely efficient alignment using the 2515 and you've got zero chance to catch up with that 10" driver with a goal of flat response over ANY single octave bandwidth you choose. If you understood what the supercharger does to the driver, you would not want it on anything less than 18" in diameter and definitely not on the 2500 motor, due mainly to the suspension specific to those drivers.

Brb dictionary lol

Seriously though, ill get the dims in the mornin when its light out. Thanks

 

[FtheNutHuggers]

laymans: don't get a supercharged anything. if you have the volume necessary for a 2515 to be extremely impressive over an entire octave or more, but have the money for a 3515......used or whatever (NOT A 3510) then you should jump all over the 3515. It is way easier to design a musical alignment without the box being larger than a decapitated giraffe if you use the 3515 versus the 2515. A huge portion of the required volume (when using a 2515) is used just to correct deficiencies that the 3515 does not have. The same thing can be said for the 3510 versus the 3512 or 3515. Too much motor force for so little cone area to have a naturally flat response over an entire octave. The response looks like a street cone in most enclosures (recommended or not) once put in a vehicle.....and different in every one you put it in.

 

[surreal 10+ year member]

You have a point, though no one here wants a flat response. If you havnt noticed, 99% of boxes people build and prefer, have an exaggerated low end with a huge peak around tuning. The BL/sd relation peak can be overcome with "more advanced" enclosure types, simply put.

Edit - and displacement != output.

In order to achieve "extremely efficient output" from an enclosure for the 2515, you certainly wouldnt be putting it in a car. Vented is about as good as it gets without multiples of box size or other tricks. Simple 2/3 rule.

 

[FtheNutHuggers]

I'd be willing to bet that 99% of the people that have those boxes would prefer a flat response if they could get it at the volume they prefer. they've never had it, that's why they have what they have. if they had, they'd never put up with an inferior design after that point. if they don't care about the output above a certain point, then simply design for a narrower target bandwidth which would raise the output over that entire bandwidth if designed correctly. if the volume is large enough for that 15 to operate with no constraints, there is nothing that could be designed in the same volume to bring the output of the 10, over the same target bandwidth, up enough to match the 15. the power handling difference wouldn't come close to making up for the displacement advantage. ask the OP if he'd like every note the box played to be just as loud as the next so that every song is equally loud on the sub side of things. few people would say no.

 

[FtheNutHuggers]

the bl:sd relationship disadvantage is overcome with acoustic steroids (box help), but the volume is used to hammer out the spiky response rather than being used to raise efficiency. where a goofy 50LB 10" sub might require 3.5 net cubes through an aperiodically coupled bass reflex to hammer the response down to a +/-3dB over the target bandwidth, a 12" could have used that 3.5 cubes to gain efficiency because it didn't start with the bl:sd ratio handicap of the 10". If we jump up to 5 or 6 cubes, we couldn't widen the bandwidth of the 10" enough to match that of the 15" while still trying to match the output of the 15".

 

[Suicide Bobb 5,000+ posts]

Save up $400 and buy my 9515 H-model //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif