need help choosing speakers

[shizzle]

Hey, im new to the car audio world and i need help choosing some subs and a box. i was thinking of getting a bandpass box. im on a limited budget, around 400 for subs and box.. i was thinking of 2 12's. i heard that the fosgates are good in a sealed box but sound crappy in a bandpass, i know the explods are not exactly good. but what do you think about the explod dvc 12" i went to best buy and talked to a guy there and he said the explods sounded nice in a bandpass box. any suggestions would be great. thanks

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[saltyjesus 10+ year member]

change your handle and your icon and i will help you

 

[shizzle]

haha, ill do anything for the help

 

[violator5spd 10+ year member]

Well I suggest you not get bandpass and instead make your own sealed box. That way you'll only spend, say, $30 on a box and have alot more for subs. As for subs...

more SQ http://www.adireaudio.com/mobile_audio/drivers/shiva.htm

more SPL http://respl.com/12se.html

nice mix? http://www.edesignaudio.com/ep/kseries.htm

 

[shizzle]

i have only attempted to make a box once, and it came out pretty bad. i was going to go to tweeter and have a custom made one done for 100 bux, and as far as the amp.. i dont have one yet

 

[shizzle]

ok, whats the difference between sq and spl... lol

 

[violator5spd 10+ year member]

Originally posted by shizzle ok, whats the difference between sq and spl... lol

sq is short for sound quality, which is how good the subs sound

spl is short for sound pressure level, which is how loud the subs get (dont have to sound good doing it, but can)

 

[shizzle]

no, i'll have about 250-300 to spend on the amp... the subs and box are a birthday present

 

[shizzle]

i would be leaning more towards sq then

 

[violator5spd 10+ year member]

Originally posted by shizzle no, i'll have about 250-300 to spend on the amp... the subs and box are a birthday present

check out a JBL 1200.1 amp...you'll find them b/w 250 & 300

 

[Lockout 10+ year member]

Originally posted by Jmac How about this ...

 

Single Brahma 10" ($360 shipped from Ampmanaudio.com)

3 ft^3 sealed box

JBL BP1200.1

I'm wondering here, with that setup, the amp would have to be running at 4 ohms right?

 

[shizzle]

holy shit 4,800 peak!!!! wow.... sounds sweet, think i should do that or try to get 2 10's or 2 12's??

 

[Lockout 10+ year member]

Originally posted by Jmac Nope ...

 

The JBL BP1200.1 is 1 ohm stable, so he can run it at 1 ohm for ~1300 RMS ...

hmmm... ok, I'm probably just confused here, but wouldn't that much power in that size box blow the sub? Here, I'll paste something I read in the Brahma owner's guide thing:

The larger the box, the LESS power is required to reach a given SPL level. The system – box and driver – becomes more efficient. For example, a Brahma 12 in a 1 cubic foot sealed box will reach full Xmax at 1300W at 20 Hz. In a 2 cubic foot sealed box will require around 800W to push full Xmax at 20 Hz. In 2.25 cubic foot ported and tuned to 30 Hz, 500W will reach full Xmax at 20 Hz. Choose your power based upon your application! Too much power doesn’t gain you more output, but can easily destroy your subwoofer.

If you’re not sure how much power you need, ask around, or use a good modeling program like WinISD Pro (not the regular/original version – the Pro version is what we want!) or other accurate modeling tool that shows excursion of the driver, and look at the results. If the excursion breaks 50-55mm peak-to-peak, you’re pushing it too far.

I've been experimenting with WinISD Pro, and according to what it's telling me (or at least how i'm interpretting it) is that in a 3 cu ft box, the sub will reach its full cone excursion with ~650 watts. Am I doing this wrong?
I'd really appreciate it if you could explain this to me, I've been wondering about this for a while now...//content.invisioncic.com/y282845/emoticons/banghead.gif.8606515f668c74f6de0281deb475b6fd.gif

 

[Lockout 10+ year member]

Ah....

(pssst... what's a sine wave? //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif )

 

[Lockout 10+ year member]

I see... so the advantage of using a larger sealed box would be...louder lower end frequencies? (just an assumption from looking at this chart and comparing.)