Could someone double check my design?

[MakeshiftAudio 10+ year member]

I havn't designed ports into it yet, and I need help determining port length with a port area of 97.5", determined by 32.5"x3". From here I will finish the design. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I would also liked the volume of the box as it is checked as well, the whole top plate is doubled.

http://img503.imageshack.us/img503/8819/cutsom2.jpg

It is for an APXX 18" running at 4kW.

TPSs from Atomic: TSPs in the normal format are posted a couple posts below.

* Loudspeaker Enclosure Analysis Program

* LEAP® EnclosureShop 5.1.0.334 Jan/25/2005

* ©1993-2003 LinearX Systems Inc

* Date: May 12, 2009 Tue 10:46 am

* LTD File=C:\Program Files\LEAP\Transducers\ATOMIC APXX.Ltd

* Electro Mechanical Parameters

Name= APX18D2.856.

Note=

Model= TSL

Domain= FreeAir

Shape= Round

Profile= Cone

Fmd= 3.0000 KA

Qmd= 1.0000

Flp= 8.0000 KA

Qlp= 2.0000

Znom= 4.0000 Ohm

Revc= 3.6000 Ohm

Sd= 125.0000E-3 M²

Mmd= 444.0000E-3 Kg

Pmax= 5.0000E3 W

Rtvc= 50.0000E-3 °C/W

Xgap= 30.0000E-3 M

Xcoil= 50.0000E-3 M

Xmax= 10.0000E-3 M

Krm= 120.0000 Ohm

Erm= 642.0000E-3

Kxm= 492.0000E-3 H

Exm= 474.0000E-3

Rms= 19.2875 N·S/M

Mms= 469.3975E-3 Kg

Cms= 12.3100E-6 M/N

Vas= 27.4725E-3 M³

Fo= 66.2095 Hz

Qms= 10.1243

Qes= 0.5041

Qts= 0.4802

BL= 37.3450 T·M

Levc= 4.9445E-3 H

SPLo= 93.8269 dB

No= 1.5166 %

* End

Click to read more...

 

[MakeshiftAudio 10+ year member]

Bump? Help anyone? This is going into a 2002 Nissan Altima.

 

[MakeshiftAudio 10+ year member]

Sdfdsfsdf. No one? :|

 

[cj407]

is it necessary to have that extra ~1.73 cubes added? with that funky design...could just do the box and eliminate that ~8x11x34 section that has the angles cut.

 

[MakeshiftAudio 10+ year member]

Well, you tell me. Would it be better to run ~8 cubes net or ~6 cubes net for it? Or is the better question: Would it be okay to run it at 6 cubes?

Thanks for the help. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[cj407]

cant tell...as the tsp's i've never seen written like that.

 

[iamamp3pimp 5,000+ posts]

i think it would be ok @ 6 net, but I like the larger boxes...

 

[MakeshiftAudio 10+ year member]

The TSPs are in standard SI unit format, not what you're used to. Let me rewrite them quick.

Domain= FreeAir

Shape= Round

Profile= Cone

Fmd= 3.0000 KA

Qmd= 1.0000

Flp= 8.0000 KA

Qlp= 2.0000

Znom= 4.0000 Ohm

Revc= 3.6000 Ohm

Sd= .1250000E-3 M²

Mmd= .444g

Pmax= 5000 W

Rtvc= .050 °C/W

Xgap= 30mm

Xcoil= 50mm

Xmax= 10mm

Krm= 120.0000 Ohm

Erm= .642

Kxm= 492.0000E mH

Exm= .474

Rms= 19.2875 N·S/M

Mms= 469.3975g

Cms= 12.3100E-6 M/N / .0000123100 M/N / 12.31 uM/N

Vas= .0274725E M³ / 27.4725 L (Is this right? O.O)

Fo= 66.2095 Hz (Wat. That's really high.)

Qms= 10.1243

Qes= 0.5041

Qts= 0.4802

BL= 37.3450 T·M

Levc= 4.9445E mH

SPLo= 93.8269 dB

No= 1.5166 %

The sub I have is a D1.4, but I forgot to specify it when I asked them for it. :\

Well, I'm trying to use as much trunk room as possible, and with taking that wedged area out, I would not being using room. Though I could now have an area to put crap... xD Though itt'd get pulverized with 4kW into this. I'll think about it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif Does port firing into the seats sound okay? It has enough room to breath.

 

[MakeshiftAudio 10+ year member]

Bump. Some advice would be appreciated. xD

If I go with just leaving that area off, and I put a port there, being 97.5"^2 port area, with the TSPs in the post above, starting with 7 cubes, how long should the port be to tune it to 36Hz?

 

[DNick454 10+ year member]

That port is really skinny for how wide it is. I would try and make it a little taller and less wide to try and at least stay in the 1:8 range of width to height port ratio. It's just a rule of thumb, but it is like that for a reason, you get weird air volume to surface area friction issues when you go way over.

 

[IDSkoT 5,000+ posts]

As a general rule, I like keeping the port ratio at least 9:1, but I hate passing 8:1. The more square, the better. Remember that.

As for the size, I'm unfamiliar with the driver. However, that Fs is pretty high, and that Vas doesn't seem right... I'm not really sure this is a good driver.

 

[MakeshiftAudio 10+ year member]

Well, those TPSs seem really, REALLY odd. The TPSs on their site in .doc format say this:

UNITS APXX18D1

Revc (ohms ) 2.00

Fo (Hz) 38.34

Sd (sqM) .1195

Bl ™ 26.88

SPLo (dB) 97.10

Xmax (mm) 10

Dvc (mm) 75.00

Qms (m.q.) 5.81

Qes (e.q.) .187

Qts (totQ) .181

Vas (liter) 112

Cms (uM-N) 55.2

Mms (gram) 312

I would say design off of this, though it's missing the impedances, though that is not needed for a box....Right?

As for port size, how about a 7.375"x15", resulting in 110.625"^2? I understand the surface friction concept, makes sense. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I really appreciate the responses guys! //content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif

 

[MakeshiftAudio 10+ year member]

Babump. Wanting to start construction on the box. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif