15L7 questions-ported/sealed/invert help?

[YZmoto125 10+ year member]

A friend of mine was recently given a deal on 2 15L7s with 2 zx1000.1s with it. He has done some fiberglass boxes in the past, all sealed, and wants to go ahead and make a sealed box for the two 15s that is about 6.6ft3, both in the same chamber. I was telling him he should port the box, but with his space provided and both of us lacking knowledge of how to make a good ported box, he decided that we should keep it sealed.

On one of the subs however, he wants to do an invert mount on it, is there any problem with one inverted and one normal in the same chamber? Also, what else would we have to do to invert the sub properly(wiring changes or anything)?

He also was thinking about using the material that you put inside of sealed boxes to make it feel like it is a bigger box(completely blanking on the name of it right now...). What do you guys think of this idea? worth it or not?

Also, how would his 2 L7 15s sealed in that fiberglass box compare to my 1 15L7 with a zx1000.1 in a ported box that was professionally made out of MDF? Any help is greatly appreciated, we both still have a lot to learn with car audio.

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[YZmoto125 10+ year member]

oh and the the L7s are 15s, and my box is about 4ft3 ported after displacement. thanks for any input

 

[YZmoto125 10+ year member]

anybody?

 

[Lakota 5,000+ posts]

You can invert one and not the other, just remember to switch the polarity on the inverted one. Polyfill? How they would compare, I'm not sure, there's so many variables. If you can port them, deffiantely do it. It'll make a nice difference.

 

[saj21187 10+ year member]

never personally seen L7s sealed, but you should do it and give us a review. i would make it out of mdf first so its not as time consuming that way if you dont like the sound of it you can scrap it without too much effort lost.

 

[Bumpin97Jeep 10+ year member]

i had 2 15 in L5's sealed at 7 cubic ft and they hit hard and had great sq...

 

[shawnfleming 10+ year member]

i just did a 06 z06 with 2 06 l710s sealed in .925 per with a zx1500.1 on the pair and it sounded great. Im not a big sealed fan, but I was impressed with them.

 

[dflw_99 10+ year member]

i have 215L7's sealed in 7cubic feet with a zx1000.1 to each of them. they slam, it make my truck backglass wiggle. i ran 0gauge to a distroblock split in 2 4gauge wire to the amp. i have a 80amp alt and i have very little dimming

 

[YZmoto125 10+ year member]

yea his set up is going to be very close to dflw_99s, he was just going to buy one and do what I did, but then since he got such a good deal on the set up he just went for 2.

polyfil is what im looking for, what do you guys think? use it or not on the fiberglass box?

 

[YZmoto125 10+ year member]

bump

also, 15L7s when put in the right box can actually sound really good sealed and retain a lot of SQ, and when you have 2 of them, they are plenty loud.....

what do you guys think about polyfil for this set up?

 

[TeoTorriatte 10+ year member]

bump
also, 15L7s when put in the right box can actually sound really good sealed and retain a lot of SQ, and when you have 2 of them, they are plenty loud.....

what do you guys think about polyfil for this set up?

Throw 3 to 5 pounds of it in the box... it doesn't hurt anything, and may help even out any upper bass peaks.

 

[YZmoto125 10+ year member]

anybody else have an opinion on polyfill?

Also, how do I invert the polarity of the sub? And I read somewhere that L7s sound really badly inverted, anybody have any experience on this?

 

[YZmoto125 10+ year member]

bump