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L7 15 in 4th order bandpass

 

Bronze Member
Username: John253a

Post Number: 19
Registered: May-11
ive got a truck so bandpass has to be the only way to fit 15's in
zx1500.1 amp (tested at 1980wrms)
2x 15 L7
contacted kicker and no specs for bandpass on theis subs
and little to go off
I have seen a few vids of then in 4/6th order but no info?
Im after street bass around 25-28hz
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14457
Registered: Dec-03
why is bandpass your only option? a 4th order box is larger than either sealed or ported. The only way, in fact, that you could come up with a larger box, would be to go transmission line or 6th/8th order.

If you want the formulae for 4th order boxes, though, look here:
http://www.diysubwoofers.org/bnd/4thorder.htm
 

Silver Member
Username: Alonzoub

Post Number: 250
Registered: Apr-10
Yea glass is right, bandpass is actually one of the largest choices when it comes to box design. Sealed and ported would be smaller options. If you are looking to tune 25-28hz you are looking at a pretty huge box to begin with and sealed isn't an option if you want to hit 25Hz.

What kind of truck is this? How much room do you have (height x width x depth)?
 

Bronze Member
Username: John253a

Post Number: 20
Registered: May-11
I have a toyota hilux also none as a Tacoma its a 4 door pickup
I curently have slim line subs behind back seats but with all slimline subs they dont do lows well and go loud
So im just no happy with them
Hence the space behind back seats im limited to 1-1.5cuft and i just fit 12" slimline's in
I already have 2x cvt8.4 under my back seats
My options are limited to (behind back seat)
1x kicker L7 8" in ported 1cuft each
1x kicker cvt12.2 in 1 cuft sealed(witch i curently have)
1x jl13 (witch a friend has also not happy with)

Or put some 15" in bed of pickup and bandpass into truck
To witch i have about 6-7cuft to work with
Also a lot of sub in usa are not avaible in aust. so im restricted to mainstream brands
 

Silver Member
Username: Alonzoub

Post Number: 251
Registered: Apr-10
I see what you mean now. I think the term you are looking for is a "Blow Through". Its pretty common to use a bandpass box in a blow through design for a truck. In that case the link Glasswolf posted will be a big help, http://www.diysubwoofers.org/bnd/4thorder.htm These are all of the formulas you will need to design your own 4th order (bandpass) box.

A warning though, if you have no idea what your doing I would suggest you leave the designing to a professional, 4th order boxes are picky and hard to get right. You could have someone design the box for you and then have someone in aus. build it for you, or build it yourself.
 

Silver Member
Username: Joe1234

Post Number: 185
Registered: May-09
Maybe PP isobaric?
 

Bronze Member
Username: John253a

Post Number: 21
Registered: May-11
The only specs i seem to find for 4th order is 3.1cuft sealed including sub displacement and 4.3 on ported with and 7.1" square port 7.5" long
Off my cal that should be around 49hz

But thats 1 huge box for only 1x 15" L7

Not to sound dumb but ive only ever herd 4th order bandpass boxes, ive never herd 6th or the hybrid
By what ive read the box can be mad smaller for theis style boxes
But do they sound any better?

In your opinion am i better building a different box ie 6th, hybrid and using 2x 15" L7 or stick with 1x 15"L7 in 4th order or maybe 2x 12L7
 

Silver Member
Username: Makinblak

Monroe/Monticello, La/Ar

Post Number: 662
Registered: Oct-10
Just build a ported box with aero ports "blowing through" into the cab. Just use the max recommended size to make lows insanely
 

Bronze Member
Username: John253a

Post Number: 22
Registered: May-11
ran the figers through winisd
for the L7 15"
3.1cuft sealed 4.3cuft ported
8" x 7.5"long port tuned at 48hz and i get some weird readings
then when i isobarik 2 in same box the scale goes off the chart
maybe i reading it wrong.
 

Bronze Member
Username: John253a

Post Number: 23
Registered: May-11
Blue is 1x L7 15"
red is 2x L7 15" isobarik front to front

http://i609.photobucket.com/albums/tt179/john253a/ytdytduytdytd.jpg
http://i609.photobucket.com/albums/tt179/john253a/uytuytuytuiytytt.jpg
When red is at 0db its @ 16 and 60hz
http://i609.photobucket.com/albums/tt179/john253a/untitledasdfrewq.jpg
 

Silver Member
Username: Joe1234

Post Number: 190
Registered: May-09
A bass reflex cone to cone isobaric will be far easier to build and box may be smaller.
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14459
Registered: Dec-03
yeah isobaric has no advantage at all.
a ported blow-through would be my choice.
4th order would work if you just wanted a big box in back and a cab on the bed, with a sealed rear window removed to allow sound from cab to bed, and seal between the camper and the cab where the window was.
Im not a big fan of 4th order though., they have to be tuned high to get a lot of gain, or if tuned low, they lose the benefit of the gain so you may as well just go ported at that point.
 

Silver Member
Username: Alonzoub

Post Number: 254
Registered: Apr-10
Yea ported blow-though would be easier IMO. Maybe 7 cu.ft for two 15" L7s with two 6" aeroports about a foot long each (tuned around 36Hz), I never heard L7's to be very low end monsters, I think they do better tuned a bit high. Put 2kW to them and im sure your ears will hurt a bit.
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14463
Registered: Dec-03
...till the Solobarics fail, anyway.
 

Silver Member
Username: Alonzoub

Post Number: 255
Registered: Apr-10
lol... yea the sorrounds on those solo's tend to tear up rather quickly right?
 

Bronze Member
Username: John253a

Post Number: 24
Registered: May-11
In aust we get 3 year warranty if installed by kicker shop
 

Silver Member
Username: Makinblak

Monroe/Monticello, La/Ar

Post Number: 664
Registered: Oct-10
Yea the surround glue gave up on both my L7s, which caused non-linear excursion after I superglued it back, which caused coil rub, which caused the sub getting plugged into a wall socket somehow...
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14467
Registered: Dec-03
surrounds fail
coils fail
lead slap issues
lead separation issues
cone distortion issues due to not being round
limited excursion due to cone shape
etc

the kicker square subs are just awful designs made for nothing but SPL. They have never, and will never sound good.
The only good solobarics were the old first generation ones from the early 90s that were still round.

sorry. I can't stand those square subs.
 

Bronze Member
Username: John253a

Post Number: 25
Registered: May-11
So most of you would recomend the cvx witch is the same sub but round
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14469
Registered: Dec-03
I'd recommend an alpine type R over both of them
 

Silver Member
Username: Makinblak

Monroe/Monticello, La/Ar

Post Number: 665
Registered: Oct-10
I think maybe part of your hatred of square is due to the fact that dumb rich noobs that know not of complicated acoustical idiosyncrasies think solobarics are the 'pitt and chips' and they blast out stupid loud dooky and think they r gangsta. Ya feel that G-woLf dawg?
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14479
Registered: Dec-03
the rich ones buy better subs. they just throw money at the car and let the installers figure it all out.
anyway, I just despise the design in general. As an engineer, I see too many shortcomings to consider it a good design for anything but short lifespan SPL.
 

Bronze Member
Username: John253a

Post Number: 39
Registered: May-11
After people on here and some installer all saying short life span and pore sql ive opted to look into other subs that will give better SQL in bandpass box up to 7-8cuft but what ever i use need to be a mainstreem brand as um limited with choice in aust

So ive added another post asking fo options avaible for SQL in bandpass up to 8cuft but mainstream brands only please
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14487
Registered: Dec-03
please don't say SQL.. it's a really bad term.
SPL is a term that refers namely to competition, and burping for peak output at the sake of total loss of anything musical.
SQ is typically a flat, natural response.
most people just want a hard pounding daily driver sort of sub. a workhorse.
There really is no combination of SPL and SQ, because they are complete opposites.

Anyway, look at TC Sounds, Fi (their SSD and BL subs) or SSA.
All have great offerings.

PS, I'm a master installer, so you've gotten that opinion on the L7 from at least two installers now :D
 

Silver Member
Username: Makinblak

Monroe/Monticello, La/Ar

Post Number: 672
Registered: Oct-10
Ok so SQL is just a convenient way of saying "I love super loud bass that sounds good" But in and of itself, it makes NO SENSE
 

Platinum Member
Username: Nd4spd18

Philadelphia, PA

Post Number: 11925
Registered: Jul-06
" Yea the surround glue gave up on both my L7s "

Not so badasz now are they?
 

Silver Member
Username: Makinblak

Monroe/Monticello, La/Ar

Post Number: 673
Registered: Oct-10
Who r u? Must b MS
 

Platinum Member
Username: Glasswolf

Columbia, South Carolina

Post Number: 14493
Registered: Dec-03
sorry. the term SQL is just a pet peeve. nothing personal.
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