Come Learn Cone Area With Me

[Enellz 10+ year member]

I have a question but I'm looking for an educated answer and reason. I wanna know the benefit of more cone area for subs, and how do each compare to one another. Examples: two 12's to 1 15, two 15's to 1 18, and etc. Is it just a simple math equation behind it? I'm hoping to get this stickied, because I know this would help a sh*t ton.

Enellz

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[Enellz 10+ year member]

Wow 10+ views and no reply? Come on people.

 

[JimJ 5,000+ posts]

Area of a circle isn't taught these days?

Pi * radius^2...

 

[Supergumby5000 5,000+ posts]

Enellz, are you serious? lol

you can use that formula above for a rough estimate. Or, if you have the driver parameters, there is a parameter that gives the driver displacement in terms of volume of air moved, i dont remember off the top of my head what it is.

there is more to a sub than cone area though, especially when you involve xmax

 

[JimJ 5,000+ posts]

there is a parameter that gives the driver displacement in terms of volume of air moved, i dont remember off the top of my head what it is.

Vd, Sd * Xmax.

 

[Supergumby5000 5,000+ posts]

Vd, Sd * Xmax.

thanks //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Villeza1 10+ year member]

Enellz, are you serious? lol
you can use that formula above for a rough estimate. Or, if you have the driver parameters, there is a parameter that gives the driver displacement in terms of volume of air moved, i dont remember off the top of my head what it is.

there is more to a sub than cone area though, especially when you involve xmax

true statement. A 15" sub could actually have more output than an 18" sub if xmax was greater. But you most likely wont see that in anybody's setup. Too many newbie's c0ck ridin steve meade and buyin Fi subs.

 

[Enellz 10+ year member]

Enellz, are you serious? lol
you can use that formula above for a rough estimate. Or, if you have the driver parameters, there is a parameter that gives the driver displacement in terms of volume of air moved, i dont remember off the top of my head what it is.

there is more to a sub than cone area though, especially when you involve xmax

Yeah. I mean people say a 15 is louder than an 18, but there's more to it than just 'loud' and a basic circle formula. I'm trying to know what factor does xmax really have. Any idiot can see a 18 is bigger than 12, but that doesn't mean it's louder.

 

[galacticmonkey 5,000+ posts]

Theres more to how far a sub will move than Xmax. Xmax is just the distance the sub can move and still give linear output. They can move further than what their Xmax rating is.

Just groundpounding and playing music loud, you want air displacement. To get that, the best way is a bunch of subs with lose suspensions that will move easily with little power.

What these people dont get is that when you have a massive SPL sub that you are trying to get loud with on music, you need so much power to move the cone so little because the spider is so stiff. Its just not very efficient for the amount of wattage put to it.

If you had a SUV for instance and 4krms on tap, yeah, you could run 1 18 ported, and it would be loud for a single speaker, but it would get hot really quickly and not be as loud as other setups. With the same 4krms, you could run 8 15s at 500rms each. Either sealed or ported it play much louder than the 18 could and it would do it for as long as you wanted.

 

[MakeshiftAudio 10+ year member]

Isn't actual sound pressure rated by the rate of change in (Work/energy) pressure for a given area for a single compression/decomprssion cycle?

I'm planning on running 1 or 2 18" APXXs in a car, is that a bad idea? It will generally be for music, but rather bass oriented music such as EBM songs.

 

[galacticmonkey 5,000+ posts]

I know alot of people personally that say the Atomics dont do well for daily. Everyone says they just dont take the power when you try to play music, and Ive seen lots of them blow in daily/bassrace installs.

 

[MakeshiftAudio 10+ year member]

Sadface. So does that means the RD HWs do the same too? I'm not using the Atomic cones or coils, since I just 1/2 fried my APXX due to an amp swinging negative due to the fan for the driver board not being plugged in, and getting a 2kWDC short for who knows how long, about 3 minutes I want to say. It is constantly smelly now, probably due to a burnt coil form, but it still is able to take a bunch of power.

So what say you on the change of pressure thought I mentioned?

 

[galacticmonkey 5,000+ posts]

Not exactly how soundpressure is measured. All I know is the Termlab measured pressure. And for pressure in a regular daily install you need cone area and subs with relatively loose suspensions.

Never used a RD sub before, so I cant comment on those.