View Full Version : for ev02k3 ported box help

02-20-2003, 12:19 PM
hi ev02k3 - i am planning to build a slot/ported box tuned to 39hz
for a 10'' solobaric L7 these are the spec for box (external)

height - 14''
width - 16''
depth - 16''
for a internal volume of 1.521 cubic feet

spec for port -
height - 12.5''
width - 1.75''
length - 20.75''

ev02k3 will this box work for the 10''L7
or what mesurements would you recommend as to box
height,width,length (and port) height, width, length and tuning feq (hz)
thanks for your help.

02-21-2003, 10:42 AM
how much power is it running? probably wont be an issue, but want to make sure that port size wont give you un wanted noise (cause by air leaving the box at more than 30m/s)....let me know and then ill confirm those numbers

02-22-2003, 02:31 AM
evo2k3 thank you for the reply
my 10''L7 is a dual 4ohm voice coil sub i have it wired in parallel
for a 2ohm load.
i will be powering my 10'' L7 with my precision power
a 600.2 (left channel) at 2ohm stereo for about 300+ watts
if it sounds ok then i will be adding another 10''L7 dual 4ohm voice coil sub
wired in parallel for a 2ohm load wired to the (right channel) and it will have 300+ watts at 2ohm stereo. i will be using the low pass output from my kicker zr460 set at
60hz into the a 600.2

my a 600.2 has no subsonic filter. will this ported box work or what
would you recommend . your help will be much appreciated
thanks again

02-22-2003, 03:06 PM
ok, lets get a start on this.....the hieght and width of your port are fine, you should not have problems with noise. I would first suggest that if you have the room to go bigger, something 2+ cubes after all displaments. which brings me to my next questin, was is the exacst displacemt of the sub? (your owners manual with explicitly list this). What are the biggest demension you are able and willing to make the box? If you wanted to stick with those demensions (which you absolutley can), I used .1(a decent guess) as the speaker displacment leaving the net volume to be 1.421ft^3 ...useing that and the 12.5*1.75" port, its length should be 17.17 inches to tune it to 39hz ...i would still like to use the exact number if you can get them, but the guess will get you very close to 39hz.

02-22-2003, 08:51 PM
ev02k3 thank you for the reply
this is the thiele/small parameters for a 10'' L7 dual
4ohm voice coil sub. that i copied from the L7 technical manual

Nominal impedance - 4ohm
SPL 1w/1m - 85.7
Displacement, cc - 1830
Displacement, cuin - 111.8
Mounting depth - 6-3/8
Revc - 3.64
VC inductance,mh - 3.91
Sd,sqm - 0.0439
BL - 16.328
Vas, liters - 35.071
Vas,cuft - 1.24
Mms,gms - 186.9
Fs - 32.5
Qms - 10.675
Qes- 0.521
Qts - 0.497
Pmax,watts - 600
Xmax,mm - 13.20

hope this infomation will help

i could also build a ported box with spec that you recommend
but i need to stay at

height - 14''
width - 16''
depth - 16-18.5'' will adjust depth per your instructions

thank you.

02-23-2003, 12:18 PM
ok heres what you can do:
build the box to 14"x16"x18.8" (HxWxD)
that will give you a net displacment of 1.783 ft^3 less 0.064ft^3 for the speaker, yeilding 1.72ft^3.

port: 1.75"x12"x12.42" (HxWxL)

that gets you tune right about 39hz, should work well for ya.

02-23-2003, 04:12 PM
ev02k3 - thank you for all your help
i'll get started on building the slot/ported box
per your recommendation (spec)
and l will let you know how it sounds.
thanks again.

02-23-2003, 07:17 PM

03-28-2003, 01:33 PM
hi evo2k3
built box to recommended spec - 14'' h x 16'' w x 18.8'' d = 1.72 cuft plus port
port/slot spec
12''h x 1.75''w x 12.50'' L
( using 3/4'' mdf)
sub pops while playing low bass,reggae, sounds bad, like a free air at high volume
mabe box volume to large for sub.

put sub back into sealed box, sub returned to normal
no poping while playing low bass. raggae
spec of sealed box 13'' h x 13'' w x 13'' d = .88 cuft

built new box - 13'' h x 15''w x 15'' d = 1.213 cuft plus port (using 3/4 mdf)
port/slot spec
11.50'' h x 1.50''w x 21.0'' L

sub sounds better no popping while playing low bass, raggae
more output volume (loud) only powering sub with 300 watts
will stay with new box spec . thank you for all your help.