So I've decided that I don't like this 38-39hz tune at all.

We have 9.5 cubes (after disp)

current port is a 12.5 sonotube @14.5" long

I can maybe stretch it 17" maybe, but all that extra port will be external. But that's only 36-37hz

12" doesn't help much either...

If I can find a 11.5" sonotube I can get to 34hz @17" long

12.5"=122.6sqin of port=12.9sqin per cube

11.5"=103.8sqin of port=10.9sqin per cube

Most people's rule of thumb for round to slot port is 3-4"

so 12.9sqin per cube =15-16.9sqin per cube

10.9=13-14.9

So what do you ladies think?

Edited September 4, 201213 yr by armykyle1

Can't read that at all on my phone.

Can't read that at all on my phone.

Dunno why lol

The font color.

I think it's black but I tried again

Dont see why it wouldnt work, try it out! Worst thing that will happen is that you still dont like how it sounds and need to try again?

Port area per cube is a joke (most of the time). You must calculate minimum port area per the driver(s) used and the desired tuning. Internal area doesn't matter either.

Port area per cube is a joke (most of the time). You must calculate minimum port area per the driver(s) used and the desired tuning. Internal area doesn't matter either.

Yes^^. There is no realtion between enclosure volume and vent area. Power and driver displacement are the dominant factors. You need to model to find out what the vent velocity will be.

What drivers, amp, and "wiring down to?"

I'd pick some tuning point, and calculate the vent mach for xxx port area. If vent mach is too high at xxx port area, and you can't increase port area due to port length constraints, then consider upping the tuning point until you find a happy medium.

Edited September 4, 201213 yr by stefanhinote

They're custom ufo BTL 18's with Zv3 sofparts. D1's

series/parallel to 1ohm. They'll be on a single DC5k for a short time then two DC5k's strapped @1ohm.

I've tried modeling the subs but keep getting errors.

The only TSP's I have are

(series)

SPL- 92.391w/1m

R(e)- 1.834

Fs- 34.99

Q(ts)- .41

Q(es)- .44

L(e)- 3.171

M(ms)- 306.1g

V(as)- 4.071cuft

I would put xmax in the 28-30 ranger since stock is 28mm but these coils are slightly longer.

No I do not know the BL

I came up with:

For two of those drivers with 6kw with 35hz tuning:

100in^2 vent mach 48.275 m/s / 0.14

130in^2 vent mach 37.135 m/s / 0.108

150in^2 vent mach 32.183 m/s / 0.093

180in^2 vent mach 26.82 m/s / 0.078

200in^2 vent mach 24.138 m/s / 0.07

215in^2 vent mach 22.454 m/s / 0.065

Edited September 5, 201213 yr by stefanhinote

I came up with:

For two of those drivers with 6kw with 35hz tuning:

100in^2 vent mach 48.275 m/s / 0.14

130in^2 vent mach 37.135 m/s / 0.108

150in^2 vent mach 32.183 m/s / 0.093

180in^2 vent mach 26.82 m/s / 0.078

200in^2 vent mach 24.138 m/s / 0.07

215in^2 vent mach 22.454 m/s / 0.065

Which program are you using?

I came up with:

For two of those drivers with 6kw with 35hz tuning:

100in^2 vent mach 48.275 m/s / 0.14

130in^2 vent mach 37.135 m/s / 0.108

150in^2 vent mach 32.183 m/s / 0.093

180in^2 vent mach 26.82 m/s / 0.078

200in^2 vent mach 24.138 m/s / 0.07

215in^2 vent mach 22.454 m/s / 0.065

Which program are you using?

http://portsgalore.s...om/?do=ventmach

The aero port section doesn't account for any flaring, just circular port area.

You can try it along with winisd.

Edited September 5, 201213 yr by stefanhinote

Also note that vas is in liters, not cubic feet, so you'll have to convert that.

Also note that vas is in liters, not cubic feet, so you'll have to convert that.

Thank you. I didn't even look at that at first.

tough choices ahead

Looks like I'm going to give an 11" port a shot with the step down in power. Plus I'm thinking about getting some of those sa/oa 18's built. Need lows

Thank you for the help guys.

Looks like I'm going to give an 11" port a shot with the step down in power. Plus I'm thinking about getting some of those sa/oa 18's built. Need lows

You're going to switch from what you have to Sa's? Sounds like a bit of a downgrade.

Just saw your post about the shifted motor

Just saw your post about the shifted motor

It shifted on the basket. Noob mistake. Used washers for spacer and loctite on only one screw.... Drinking and sub building lol. I already paid for parts to rebuild it.

The SA/OA 18's should offer better low end and might perform better on the DC5k. I might have Nick use SPL coils, not sure yet. But I want then low lows

2500 a piece...?

Hopefully

Looks like I could only find a 11.3" sonotube lol.