4th order banpass build Log

[Lord Baccus 1]

Jeff & I & Codie were buizzy...

Jeffs amp rack

My 4th order Banpass

Dammmmmmm that thing was Heavt to move into the SPLXplorer by myself

[2000LaDe 1]

score?

[///M5 2,833]

wth is that?

[armandomacedo 0]

what kind of sub is that?? massive and nice job. wish I had the time and knowledge to build something like that. vids after??

[galacticmonkey 0]

Looks pretty crazy, but if it works, what the hell?

Any scores? Does it sound loud? Or is it just a fartbox?

[Basshead 3]

score?

x2

and i LOVE the sundown amps that have the...well...sundown pics on them

[Tmax98 3]

ya that graphic is pretty clean!

[bjustarzan 0]

hello the sub is an pierceaudioproducts designe and it is an beast

i have two of theirs 18" and they are real monsters

[Lord Baccus 1]

something went DREAD WRONG with my math,

as i figured the box to be tuned too 52Hz and it was hitting @ about 120Hz & 36/45Hz range

never got it over 146.6db

Back to the Drawing board

as for the SunDown pics on the amps

i took those @ lake Texoma as the sun went down and i use it to cut the Sundown Logo for my front window decals

Plain logo

my version

[ford302redneck 15]

Nice try.

Whats the full specs on the box?

[Lord Baccus 1]

ill post em tomarrow when i get BBP6 open @ work

[///M5 2,833]

I am curious how you think you figured your tune...

[Basshead 3]

damn so they're your own pics? very nice pic too. the sundown banner is SLICK! very nice. you sell any? if i were to find a pic. dont wanna steal your same ones

[ford302redneck 15]

I figured the box is acting like a funky horn.

[Lord Baccus 1]

i tried to tune it the way i do a regular ported box,

i added the displacement of the known object

( the sealed side of the box and then tuned the open side as i would any other ported boxx )

Guess i need to read up on how to do the 4th order banpass before giving it another try ???

but i did leave myself an out if i F-ed up the Lid of the box is removable with a lil tweeking i can correct my mistake and try later

assuming i can find out where i screwed up

I need Help

[WildSebring 0]

It's the first time me and Brian and Cody built something like this. We made a wrong calculation somewhere...but stuff happens and we'll eventually get it right.

When we do get ti right though....watch out...

Their are always going to bumps in the road...especially when this is the 1st time we have tryed this type of box...But we will go back to the drawing stages and get it right...

[ford302redneck 15]

Use a 5:1 ratio.

1 cuft sealed chamber, to 5 cuft ported chamber.

You only need .5 sealed for that moofer and that would give you 2.5 in the ported chamber.

Do say 60sqft of port, tuned to 5hz less than peak.

[///M5 2,833]

Couple major things that make no sense. You forgot the second chamber and a 4th order won't buy you what you are looking for as it will be quieter than a ported enclosure.

[Lord Baccus 1]

Use a 5:1 ratio.

1 cuft sealed chamber, to 5 cuft ported chamber.

You only need .5 sealed for that moofer and that would give you 2.5 in the ported chamber.

Do say 60sqft of port, tuned to 5hz less than peak.

i was thinking for the fun of it i will convert it to a TL box or folded horn using the SoundStream SplX 12" Quad coil

any ideas ? no sense in wasting the MDF, just a few mods and i think it will work

[galacticmonkey 0]

If you have enough scrap wood for an extra box, build a bandpass for the 12.

Go 1 cube sealed, 1.25 ported, with about 40 sq in of port tuned to around 55hz.

[Lord Baccus 1]

If you have enough scrap wood for an extra box, build a bandpass for the 12.

Go 1 cube sealed, 1.25 ported, with about 40 sq in of port tuned to around 55hz.

sounds good

i think i f-ed up by having the door open yesterday...

i forgot BP needs a sealed car/truck

[danracer 0]

perhaps yo can steal some area to the box adding more wood or something inside the chambers, to bad it didnt work, it suxs to spend the cash on the box and it doesnt work, but hey this is spl trial and error...good luck on the next one, or on the remodelation of this one

[2000LaDe 1]

If you have enough scrap wood for an extra box, build a bandpass for the 12.

Go 1 cube sealed, 1.25 ported, with about 40 sq in of port tuned to around 55hz.

sounds good

i think i f-ed up by having the door open yesterday...

i forgot BP needs a sealed car/truck

you should never meter with the door open anyways!!!

[DevilDriver 28]

If you're going the "different" enclosure route, your best solution is likely a 6th order bandpass...still very big, but smaller than an 8th order and more practical than a horn or TL for your application. If well designed and well built, the limitation becomes how much current the coil can handle.

Of course, it is even more complicated than the design of a 4th order, so you might be out of luck in that regard.

[ford302redneck 15]

If you have enough scrap wood for an extra box, build a bandpass for the 12.

Go 1 cube sealed, 1.25 ported, with about 40 sq in of port tuned to around 55hz.

Im glad you know so much about bandpass, and built so many of them.