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ingine53
01-04-2010, 12:05 AM
I am still a noob to car audio and have a few questions. Doing research I have found out that a subwoofer box can make or break a subs performance. All over the internet I see people saying their subwoofer box is tuned for a certain number(like 32). I've never really understood what this means. I have decided to get 2 kicker l7 15's and the kicker zx1500.1. I have found a ported box on ebay that seems small for 2 15's and it says its not tuned. Here is the link.
http://cgi.ebay.com/ebaymotors/NEW-KICKER-DUAL-15-SUBWOOFER-L5-L7-PORTED-CAR-SUB-BOX-U_W0QQcmdZViewItemQQhashZitem1e59c0dbdfQQitemZ1303 54830303QQptZCarQ5fSubwoofersQ5fEnclosures#ht_3105 wt_1167
Can someone explain to me what tuned means and if this box would be the ideal box for 2 kicker l7 15's.

SicAudio
01-04-2010, 12:09 AM
any ported box is "tuned" thats what the port does but build ur own the L7 as well as any other sub needs a specific box to really hammer good like they can the box u linked is a kicker spec box and will work but not like they are capabale of. and fwiw that 1500 is no where near enough ;)

ingine53
01-04-2010, 12:13 AM
I read kicker underrates their amps so that amp is really putting out about 1800rms at 2 ohms. The two subs can handle 2000 total so 1800 would be close enough wouldnt it?

ingine53
01-04-2010, 12:15 AM
So what box would be better than the one I linked? I really dont want to build my own. dont got the materials

SicAudio
01-04-2010, 12:15 AM
that amp does closer to 1650-1700 after rise maybe 1400

SicAudio
01-04-2010, 12:16 AM
you wont find a prefab that is 5 cf per sub ;)
they need 5cf to really hammer that box is fair its exactly to specs but kicker does the specs to protect themselves not to help you.

ingine53
01-04-2010, 12:18 AM
What do you mean after rise?

ingine53
01-04-2010, 12:20 AM
Where would I find the ideal specs for a box to build for the two kickers?

SicAudio
01-04-2010, 12:22 AM
right here
5cf per sub tuned at 35hz ;)

SicAudio
01-04-2010, 12:23 AM
What do you mean after rise?

music is transient
the load the amp sees changes when the sub is in a box it is called rise which means the ohm load the amp sees is higher than you think so say ur box has a 1.5 ohm rise but you wired the subs at 1 ohm to the amp after rise means the amp sees 2.5 ohms not 1

ingine53
01-04-2010, 12:24 AM
So the length width and height could be any combination as long as it is 5cubic feet per sub?

SicAudio
01-04-2010, 12:25 AM
yes

ingine53
01-04-2010, 12:35 AM
What amp would you recommend for 400 or under?

SicAudio
01-04-2010, 12:38 AM
330 shipped i have a 2200 rms dsc2000.1d amp i also sell the L7 if you dont already have them

new not used with full warranty

ingine53
01-04-2010, 12:47 AM
how much for the l7's

Villeza1
01-04-2010, 12:55 AM
God Dammit Sic...

you did it again.

ingine53, listen to the guy for he has been right up till now.

ingine53
01-04-2010, 01:00 AM
have i not been listening to him?

Villeza1
01-04-2010, 01:03 AM
I was just reassuring you just in case you were doubting his advice.

SicAudio
01-04-2010, 01:03 AM
if i do the L715 as cheap as i can i may be able to do them for 310 shipped each only cuz u r in AZ and it cuts shipping way down

SicAudio
01-04-2010, 01:03 AM
I have done a ton of Kickers in my 20 plus years they are a sub a know very very well lolz

Villeza1
01-04-2010, 01:06 AM
I have done a ton of Kickers in my 20 plus years they are a sub a know very very well lolz

So do I, had 4 cvx 15's in a 23.75ft^3 box b4 displacement on 2 crunch gp3000d pro's. Was a ****** setup but I wanted louder.

ingine53
01-04-2010, 01:07 AM
http://cgi.ebay.com/MB-Quart-DSC2000-1D-Class-D-2000W-Monoblock-Car-Amp-NEW_W0QQitemZ290385206936QQcmdZViewItemQQptZCar_Am plifiers?hash=item439c4e9e98#ht_1800wt_1167
http://cgi.ebay.com/ebaymotors/NEW-KICKER-15-08S15L72-SOLOBARIC-L7-CAR-SUB-S15L7-2_W0QQcmdZViewItemQQhashZitem518edf8d82QQitemZ3502 89366402QQptZCarQ5fSubwoofersQ5fEnclosures#ht_4277 wt_1167

Thanks for all your help. found everything a little cheaper on ebay

SicAudio
01-04-2010, 01:10 AM
they replaced the gp3k for this new 2010 year :( but they made it even better and dubbed it the mighty BXI 3010D !!!!

SicAudio
01-04-2010, 01:10 AM
yup it is cheaper and no warranty sonic buys from my oakland warehouse ;)

ingine53
01-04-2010, 01:11 AM
If I were to use the amp you recommended, should I get the 4 ohm or 2 ohm kicker subs? And how would I wire them?

Villeza1
01-04-2010, 01:12 AM
they replaced the gp3k for this new 2010 year :( but they made it even better and dubbed it the mighty BXI 3010D !!!!

Oh really, I didnt know that. what's gonna happen to the Vpower GP 3000d?

SicAudio
01-04-2010, 01:19 AM
dual 4 wire to 1 ohm

SicAudio
01-04-2010, 01:20 AM
Oh really, I didnt know that. what's gonna happen to the Vpower GP 3000d?

it became the brutus 3010d :)

PV Audio
01-04-2010, 12:35 PM
What do you mean after rise?
Take a 4 ohm speaker and put it on the ground. Hook up some measuring equipment and play a tone through it at a frequency not really near its resonant frequency and it should read around 4 ohms. Now, put it in a box and do the same thing. It won't read around 4 ohms; it will be slightly higher. Why? A speaker has what is called impedance: anything that resists movement is called impedance. A resistor has impedance, as do inductors and capacitors. Your speaker has 3 types of impedance: electrical impedance, aka, what the voice coil rating is (4 ohms maybe), mechanical impedance, aka, how the moving parts of the speaker limit its movement and finally the third which is called radiating impedance which is a function of how well the speaker can move due to the air (a small 2" speaker has a far lower radiating impedance than a large 21" subwoofer just as it's easier to wave a toothpick quickly than it is an oar). When you put a speaker in an enclosure, that changes the radiating impedance.

These changes are dependent on the size and tuning of the enclosure. Putting a speaker in an enclosure with a higher impedance than free air will cause the impedance to rise at certain frequencies. I'm trying to keep this as simple as possible, so if it doesn't make sense, please ask and I'll clarify. Think about it like this: it's easy to compress the air that you're sitting in right now with your hand, but try to compress a bag filled with air. Once that pressure increases, the impedance increases. Increase the size of the bag, and the impedance drops.

Please note that this is an extremely rough and not entirely scientifically nor mathematically accurate description, but it's just to help you understand what impedance rise means. I could give you a fleshed out response, but you wouldn't understand what I was talking about since you're just starting in audio :)