4.5 c.f box for zv3 15/18

[UDI]

Hello, I'm about to order a sundown z v3 sub

and I've got a 4.5 cubic feet box (after the sub displacement and ports, 4.5 only for the sub)

I want the sub to be as louder as posslble, for daily use and I cant decide which sub to take.

on sundown website it says 4 cf box for 18" ported.

I want to play low and not 50hz+, more like 30-40 hz

my box is total of 5.5 cubic feet, two round ports (pipes) 6" x 25.6" (by my calculations the box is tuned to 33 hz)

I dont know which sub will give me better results.

should I take the 18" ?

should I take the 15" and make the ports longer?

should i take the 15" and leave the box as it is?

my amp is 1.6k and I've got XS Power D2400 battery, if it matters.

any ideas or directions?

Thanks!

[cjvue]

I'd go with 15"....

[UDI]

any idea about the box / ports?

if i take the 15", make the port longer for lower tuning, or leave it as it is?

[UDI]

another option is Zv4 15 (will be on 1.6k rms)

[Tebo]

Your guna want way more power on that zv4 FYI

[mrd6]

what is your reasoning for making the ports longer in getting the 15 over the 18?

I would probably do the 15 and leave it the same for now. Then change if necessary.

[UDI]

I really wanted 18", but there is not enough space in my trunk for 6 c.f box

I thought maybe 4.5 would be enough.

I'll probably go for the 15"

how much would a flared port will affect?

the ports I've got are normal, no flared end

[Ben Fultz]

Flared ports cut down the turbulence at the opening, and drastically reduces the potential for port noise.

[PowerHouse407]

4.5 is quite big for a z v.3 15 but eater way you go v.3 v.4 there going to want more power than that.

[UDI]

I want to take the Z v3 18" !!!

I'm thinking about building a new enclosure

with MDF 0.75" I can have max of 6.5 cubic feet (before taking off sub displacement and ports)

and If i go on 1" MDF, I can have 6.2 cubic feet (before sub and ports)

sub displacement = 0.16

ports are - 0.81

both are around 1 c.f

so it means with MDF 0.75" its 5.5 c.f for sub

and with MDF 1" its 5.2 c.f

that would be enough? or still not ?

I have around 1 week to decide.