XXX18 w/ passive radiators...

[CreeDiddy 10+ year member]

Well I am interested in hearing more about the XXX18 w/ PR's... Looking into the Stryke SA-PR15-700. How about a pair of these PR15's with a XXX18 in a 5 cube box?

Cree

Click to read more...

 

[Bavarian3 10+ year member]

whats a PR? and XXX is an awesome woofer. an 18"....good god.

 

[CreeDiddy 10+ year member]

Kick back and learn a minute!

http://www.diysubwoofers.org/prd/

Cree

 

[Bavarian3 10+ year member]

hmm interesting, see what the port masters say about it..

 

[Randy Savage 5,000+ posts]

Just port the god **** thing...

 

[LoneRanger 10+ year member]

Just port the god **** thing...

I'm with snova on this one.....

Leave the PR's to the home theater guys. You're not going to gain much SPL over a simple ported design, and if you plan to compete, you have to count your PR's as extra cone area. It's something fun to play around with, I suppose, and you'd probably be the only kid on your block who knows what a passive radiator is, let alone owns one.....

 

[sundownz Pro Seller]

I wouldn't do the XXX 18" ported for a daily setup -- the 0.59 Qts isn't looking too favorable on the sub. It may suit your needs for a 70/30 SPL/SQ type setup though.

 

[gettnbig 10+ year member]

I wouldn't do the XXX 18" ported for a daily setup -- the 0.59 Qts isn't looking too favorable on the sub. It may suit your needs for a 70/30 SPL/SQ type setup though.

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[sundownz Pro Seller]

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

Let me try again... I wouldn't expect the XXX 18" to sound all that great ported with the 0.59 Qts. But if he is more in the market for 70% or more SPL and not all that concerned with SQ then he'll probably be happy with it anyway.

 

[Randy Savage 5,000+ posts]

IB it!!!!!!!

 

[CreeDiddy 10+ year member]

Thanks for your suggestions. I still think the PR's have huge potential. Yes the Fs is quite low 23-27 Hz neighborhood, but the low end should sound quite well with PR's. However, this is just speculation.

Cree

 

[CreeDiddy 10+ year member]

Any suggestions with a XXX18 and dual 15" PR's?

Cree

 

[abcdefg 10+ year member]

hook it up to a wall outlet pull up a lawn chair and enjoy seeing 400 and sumthin $$$ go down the drain

 

[orionmanmatt 10+ year member]

Correct me if I'm wrong but doesn't it seem like most of the uses for passive radiators is with 8", 10" and 12" woofers and NOT 18". The desired effect is to have both quick response but let the sub play lower more efficiently without the added strain on the woofer itself.

It is also tougher to tune a passive radiator. You have to add/subtract mass to the centerpiece of the PR and use more equipment. But a lot of that extra effort is because there is not as much information out there to help people tune their PR's as there is with formulas and help for tuning a ported enclosures. Ports are much easier to deal with.

Just port the **** thing!

Not to mention it seems to me that you might have some cancellation issues too.

 

[454Casull 10+ year member]

Correct me if I'm wrong but doesn't it seem like most of the uses for passive radiators is with 8", 10" and 12" woofers and NOT 18". The desired effect is to have both quick response but let the sub play lower more efficiently without the added strain on the woofer itself.
It is also tougher to tune a passive radiator. You have to add/subtract mass to the centerpiece of the PR and use more equipment. But a lot of that extra effort is because there is not as much information out there to help people tune their PR's as there is with formulas and help for tuning a ported enclosures. Ports are much easier to deal with.

Just port the **** thing!

Not to mention it seems to me that you might have some cancellation issues too.

A passive radiator setup has a higher group delay than a vented system. Passive radiators are usually used when ports would be impossible or inconvenient to use - i.e. when the port length would be too long, or when the port air velocity would be too high (chuffing would result).

You get about as much cancellation from a passive radiator as you do from a vent; as you approach the tuning frequency from the higher frequencies, excursion of the driver(s) goes lower and lower since the passive radiator/vent does more of the work, and then it goes higher and higher since you get cancellation from the PR/vent.