Please help me design a PR subwoofer

[mike c]

the driver:
http://www.edesignaudio.com/product_...roducts_id=554

the PR:
18"
http://www.audiopulse.com/products/p...-radiators/vmp

additional data:
18" TC-VMP
Vap 0.0
Dia 390mm
Vas 0.0l
V-Fs 4Hz-24Hz
cms 0.0m/N
V-mms 500g-2500g

i'm aiming for it to act like a 17.6hz tuned ported subwoofer

questions:
1) anybody have specs on the 18" PR? i need QMS, Vas and Fs to be able to model with winisd. (winisd doesnt accept 0, what fs do I enter?
2) so the heavier i make the PR, the lower the tuning?
3) will enclosure volume change tuning? i mean, i can go bigger if it means making the box more efficient at being tuned low.
4) can i put both active and passive driver on the same baffle? (same side, making a tall tower all front firing)

[a1161979]

This had better be the begining of that Build thread im demanding Mike

Id love to help but im sure someone with more experience with passives will chime in and help, i take it you have you driver then Pictures please, how about one of your son sitting in it Although not while playing test tones like some idiot on the net (anyone else seen that?)

Come on guys get cracking and churn out some plans for the man

[mike c]

yep, this is the one

the active driver should arrive tomorrow.
the passive driver is more than a month away, but if people help me out, i dont think its necessary to wait for the passive driver before starting the box

[WmAx]

mike c wrote:

t
1) anybody have specs on the 18" PR? i need QMS, Vas and Fs to be able to model with winisd. (winisd doesnt accept 0, what fs do I enter?

Call Audiopulse/TC, they will provide you with the data that you require.

2) so the heavier i make the PR, the lower the tuning?

Yes.

3) will enclosure volume change tuning? i mean, i can go bigger if it means making the box more efficient at being tuned low.

Generally, as you decrease tuning frequency of the PR/port, you increase volume. If you decrease tuning frequency substantially and leave the volume fixed, you will have a highly dampened ported/PR system with a smooth and broad roll off that starts considerably higher into the band as compared to the tuning frequency of the port/PR.

4) can i put both active and passive driver on the same baffle? (same side, making a tall tower all front firing)

Yes.

-Chris

[mike c]

thanks Chris!

[mayhem13]

There are some excellent pr's available from funky waves that include the specs. i've got them loaded into Unibox already so if you're interested in using those instead-let me know and i'll model it for you. Just modeled at RLP-15 with 2 PR's and it modeled as well as ported in half the volume.

[mike c]

mayhem13 wrote:

There are some excellent pr's available from funky waves that include the specs. i've got them loaded into Unibox already so if you're interested in using those instead-let me know and i'll model it for you. Just modeled at RLP-15 with 2 PR's and it modeled as well as ported in half the volume.

thanks, but i dont have access to other PR's at the moment. funds have become really scarce

[mayhem13]

So you paid for the AP passives already but have to wait months to get them?

[mike c]

i only bought 1 AP passive (the other one was purchased by Financethi$ (jeff) )

and yes, i will get them in about a month++

[Mike P.]

Post pics when you get it. You'll be the first to get one, as far as I know. Looking forward to seeing what the beast looks like!