rgarrett

Thanks for the advice. I am definitely going to do the removable port. Would you go with a rectangle port or multiple round/aero ports? Also I will be using about 4k watts, is there anything I need to look out for or be aware of with that much power in a bandpass?

Very true, but how does the tuning in a bandpass work. For straight ported boxes you tune below your frequency. It is the same for bandpass? I have heard the tuning should be higher like 50+. Thanks for the help

Hello everyone, I am in the process of designing a 4th order bandpass box for my 2 Sundown Zv3 12s. This build will be mostly for SPL numbers but would still like to be able to play some music with it. I talked to Sundown and they said to use 1 cuft per sub for the sealed portion with a 3:1 ratio. So I have a box design with a sealed portion of 2 cuft and a ported portion of 6 cuft (all after displacement). The subs will be inverted firing into the sealed portion with the motor in the ported portion. The ported side will be 41" w x 20" d x 17" h (outside dimension). My question is about tunning. What should I tune the ported side to? Should I use a large rectangle port or round ports or aero ports? What port area per foot should I use? This is going in the trunk of my 2007 Ford Focus. The car peaks around 48hz. Any and all help will be greatly appriciated. Thanks.

Sweeeeeeeeeeeet, I'll be there with both boxes

The 18 Z v3 sound really good. I heard two in an Avalanche and man were they loud. As for an amp, I really enjoy my Powerbass XTA 5000d and the Sundown NS-1 is pritty awsome too.

It was @ 48hz in an SPL burp box. I also just got my music box installed with 1 Sundown 12" Z v3 and let me tell you it is amazing. On music I am doing a 149db. The sub sounds amazing and would recommend if for daily play all day long. It is so load on music that I just broke my passenger side mirror, just fell apart. Check out the videos of my car: Burp Box: Music Box:

I would recommend going with 2 Sundown Z v3 12" subs facing up with one large aero port facing backwards. I am using one Z v3 12" in my ford focus trunk car on a PowerBass XTA 5000d and hit a 152.4 in the kick on ~3200 watts. These subs are great and will take whatever power you want to push to them. Just my two cents.

Here's mine Battery Under the Hood Battery in the Trunk

Love my XS Power batteries also. I have a D3400 installed under the hood and a D3100 in the trunk running my Powerbass 5000d.

Count me in

I am so jealous