Hello guys

 

I have:

 

VW Golf 4 hatchback car

2 x AA Mayhem 15' D1

Skar Audio sk 4500.1d

2 x Crescendo F31-Hp

Stock alternator 120A

 

 

I need advice:

 

Daily box

Wired to 0.7

Tuning 32hz

What surface area of port ?

What internal volume ?

 

Spl box:

Wired to 0.25

Car peak around 50Hz

tuning box 47 Hz

what internal volume ?

what surface area ?

 

I need this volumes and surface area from users who play with mayhems or similar subs like n2, n3, zcons etc.

 

Thank You

Michael

Edited May 24, 201411 yr by keddy

Whaaaaaaaaa

ROFL. WTF is this?

First.. What size mayhem, how much space do you have??

2 x AA Mayhem 15' D1.

 

The maxim internal brut volume for this subs is arround 7.5 cu ft.

 

Now I have a box tuned to 37Hz with 39.4 x 23.8 x 20.1(inch) external dimensions

But i want to make two box, one for daily one for spl.

Edited May 24, 201411 yr by keddy

Ooooooo I missed that in the title. My bad. Alton is your man, hopefully he sees this

Why not build one box with interchangeable ports so you can have a daily tune when you want it and a spl tune when you are competing?

I installed that exact driver with a Cresendo 3500.1 (4Kw roughly) last year.  I ended up with 4ft3 and roughly 70in2 of vent area @30Hz, IIRC.  Works fantastic.  Honestly though, there is no rule of thumb for vent area.  You need to model with your alignment and power to see if you will have compression issues.

I start working on this box.

 

it will be with two 8' PVC interchangeable round and flared ports.

 

For daily the box will have 7.6 cubic feet, 2 x 8' flared round ports, 32Hz with 27' depth and 97.4 sq inch area

For SPL the box will have 8.2 cubic feet, 2 x 8' flared round ports. I will start from 42Hz tuning to find the car peak freq

Edited May 28, 201411 yr by keddy