"Magic Box" V.2 For an 18"

[shortybwam 0]

Does any one know where I can get some terminals like that

[sundownz 197]

Does any one know where I can get some terminals like that

You can call and order the brass threaded rod, nuts, and washers from the same place I get them (they are local to me so I pick up):

Piedmont Fastener Co‎812 South Main Street, Troutman, NC 28166-8514(704) 528-6150‎

[sundownz 197]

Threw some good power on it today and hit 155.9 dB -- really close to the v.1 box results but this is with a Z v.2 =)

Now to try an NS v.2 18 in here when they arrive !

[draggnwagon 2]

what kind of bolt do you use for terminals?

I know the answer to this one. its bass threaded rod. probley 5/16 or 1/4

Hahaha, "bass" threaded rod.

was fitting! but a spelling era that im good at. i meant brass of curse.

[draggnwagon 2]

i use brass thumb nuts on mine for easy change or removal.

[hrtbrk1 2]

good work jacob

Edited May 28, 2010 by hrtbrk1

[CrazyKenKid 64]

the secret you speak of is it in picture 3

if not it must be in pic 1!! (the sticker)

overall awesome job and a nice read! maybe consider this for the technical section?

The "secret" is a bit more complicated than the pictures might imply... I'd be impressed if someone figured it all out from the pics

I spent all morning the other day reverse engineering the old box since we built it 3+ years ago *laughs* Then I scaled it up and kept the important ratios identical to the old box but a bit larger for an 18.

[sundownz 197]

Threw some good power on it today and hit 155.9 dB -- really close to the v.1 box results but this is with a Z v.2 =)

Now to try an NS v.2 18 in here when they arrive !

Same score with an NS v.1 today as well (155.9 many times) -- may be maxing out the pressure my Jeep can take with a rear-firing port.

Looks like I need to start on my forward firing setup soon!

[stevemead08 752]

Sweet. congrats dude!

[stevew007 0]

The "secret" is a bit more complicated than the pictures might imply... I'd be impressed if someone figured it all out from the pics

the baffle is sloped towards the port?

[sundownz 197]

The things that make it work so well have to do with the phase of the port to woofer cone and also playing with loading the port against a plane on both ends to get the correct tuning... some of which was luck on the first box but I was able to reverse engineer it and make another similar box as shown here.

[sundownz 197]

* Drivers side fully foamed in and enclosed

* Passenger side fully foamed and enclosed

The above made my SPL drop hard (I am doing it to prepare for my bandpass setup)... so we came up with an idea.

* Mini skateboard ramp !

* Another view

This brought my peak SPL back to where it was and my efficiency almost back to where it was. Too bad I never tried the ramp before the foam... I thought about it but never got around to it.

[sundownz 197]

Before anyone asks... we tried closing the sides up and SPL dropped -- it was best open like that.

[Adrian_D 520]

Interesting stuff with the side panels Jacob.

I'm also curious to see the bandpass setup. Always wondered about a 4th order in the jeep, simulations show a good increase in efficiency.

[tijae 0]

i need  the buleprint for one of these boxes i have 2 15s nightshades 

[jonbearsmt 919]

i need  the buleprint for one of these boxes i have 2 15s nightshades 

3 years later.......

 

 

 and that wont happen these are jacobs comp boxs.