I swear, this is a SHORT L7 question.

[yacob.naif 10+ year member]

I have two L7 15's in 4.5 ft^3 tuned to 42hz.

Don't ask about the tuning, i'm basically just an idiot.

Anyways, talked to kicker on the phone, they said 33 or 35 hz.

I'm going for crippling loudness, not sq. And i need to know what my new box should be:

Thanks!

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[bibby 5,000+ posts]

For crippling loudness, i think the 42hz is aight, but the 4.5cuf needs to be around 6cuf after displacement

 

[justinschmiidt 10+ year member]

39 - 42hz

 

[yacob.naif 10+ year member]

added a poll.

the 15's don't seem to like being tuned that high, tho.

My 35hz test tone is almost as loud as my 45hz test tone, even though my f3 rolloff should be around 37hz......

That leads me to believe the speaker naturally wants to play lower notes...

 

[wilzyx 5,000+ posts]

for loudness, tune it to peak at the same frequency as your vehicle peaks at, then drive around playing sinewaves...

i do that all the time, it gets the babes

 

[yacob.naif 10+ year member]

Hahaha, oh man, be serious.

I'm not trying to be "that guy" it's just i've got alpine type-x's in a 30hz setup for daily driving/ SQL setup, i'm just looking for a more "fun" setup for the summer. The type-x's are decently loud, but...... let's just say i've heard louder.

I owned a 15" L7 back in the day, and it was loud as hell, but i have no idea what it was tuned to, and the shop i bought if from knows less about port tuning than i do.... Seriously.

When i asked him if 42hz would be ok, he said "Only if you want to compete, that's way way too low for any kind of sound quality." And then proceeded to tell me his diamond D9's were tuned to 50-60hz.

The other local sound shop is even less knowledgable, and i almost got into a fist fight with the clerk there, because i took it upon myself to make him look like a complete ******* in front of other customers, when he also told me that 30hz was way way way too low for tuning, and that he also had his tuned to 60hz.

And the short version of the 42hz tuning story, is that when i owned 12" L7's, i had them tuned to 42hz, and they were LOUUUUUD. So i figured if it worked for 12's, it would work with 15's. Needless to say, it didn't work.

I'm just trying to get some advice from you guys, perhaps someone with actual experience with 15" L7's could chime in? I realize 42hz SHOULD be loud, that's why i tuned it that way. The 15" L7's are tricky, tho, as i'm learning. And are actually built less for SPL, and more for actual music use/street beats type competing, where the 10's and the 12's own the higher frequency reproduction.

 

[yacob.naif 10+ year member]

And i'm not necessarily going for XXXXTREME SPL!!!!

i just wanted to make sure nobody took SQ into consideration, because i'm not that concerned with SQ, just making some noise.

 

[DiDan 10+ year member]

use 4" aeroports and try different lenghts, starting with 33Hz tuning and shorten them in 2Hz steps untill you found out what you like?!

DiDan

 

[Raisedin305 5,000+ posts]

For crippling loudness, i think the 42hz is aight, but the 4.5cuf needs to be around 6cuf after displacement

If he meant 4.5 per chamber then he's fine now 4.5 for both subs and he has a problem.

 

[AndonD454 10+ year member]

how much power you got on each?

 

[xpl0it 10+ year member]

You're choking your subs with that little of space, get 2 12" L7s, put them in the same size box and tune them to near 40hz. That'll make some noise. However, when you say "make noise" I think lower frequency carries much farther. For instance, my old system got extremely loud at 36hz (pretty low for a 12) and could be heard from far away and would literally shake windows on schoolbusses( always loved doing this at stoplights by a schoolbus) but my friend's car which has 2 12" directed studios off a 1001bd in a smaller box tuned to 42hz does in fact hit you harder and makes you feel it more, but outside the car, his noise didn't travel as far as mine. But by all means, if you want it loud as crap in your car, tune near 40hz for 2 12" L7s and you'll be happy, 2 15's tuned near 38-40hz may not perform as you'd think the extra cone area would do.

 

[SBLAZER]

4.5 per driver tuned to 30 or 33hz will wang. thats fine. i wouldnt go no less than 4.5 per.

 

[ighettoboyi 10+ year member]

go low like 33hz... my solo 10s liked their 34hz tuning...

 

[hoodkid 10+ year member]

I would get 5 cubic feet, after port and sub displacement, and tune around 34 - 37, because I had a box tuned to 42hz,and it just sounded to awfull.

 

[vetkilr 10+ year member]

I would get 5 cubic feet, after port and sub displacement, and tune around 34 - 37, because I had a box tuned to 42hz,and it just sounded to awfull.

I thought it was 37.............lol