WOOx Technology?

[form109]

has anybody Heard of WOOx?

apparently its a Technology developed by Phillips which employs a Passive Radiator with a Doudle Surround,along with an Active Woofer and Active Equalization.

has anybody owned a system with WOOx?

[Pallas]

Except for the double-innertube/no-spider PR, that's not different from what a lot of us have been doing for a long time. Certainly not worthy of a special branding. See, e.g. Thunder Subwoofer Kit Info

[form109]

Originally Posted by Pallas

Except for the double-innertube/no-spider PR, that's not different from what a lot of us have been doing for a long time. Certainly not worthy of a special branding. See, e.g. Thunder Subwoofer Kit Info

the wOOx is indeed Basically a PR System....but it says the Double Roll surround's High Excursion copuled with a High Excursion woofer and Active EQ is the diffrence.

the wOOx supposedly works by Providing Extra Equalization at the systems tuning frequency.

and that Double Surround PR does Look Cool,and from what i hear the wOOx Technology sounds really good.

[null object]

Digging an old thread but hey!
I have used this Woox technology by means of a portable ghetto blaster thingo that Philips made.

It eventually blew up and I was able to break it down. Indeed it is a PR but it does have a massive XMAX Something around 15mm from memory maybe greater. I was pretty impressed for a 4 inch passive radiator.

I threw it away without a 2nd thought though.

I have a techie mate who works for Philips Australia who might be able to get his hands on some with the spec sheet too.
I'll ask him.





edit... Links dont seem to work - try this:
http://urun.gittigidiyor.com/ev-elek...17109#aciklama

[wolf_teeth]

Some of the Kenwood/Phillips boomboxes I saw with them had both the WOOx and a port in the same volume.

Kinda bizarre...
Later,
Wolf

[River757]

About five years ago I was very close to buying a Kenwood automotive subwoofer using the wOOx system. Such a tiny enclosure, about the size of a typical dictionary, but sheesh did it have clean punch & depth! If you didn't see it, you would have thought there was a box with a 6.5" conventional woofer hidden somewhere in the demo room. Both the woofer and the P.R. had crazy amounts of cone travel & even at normal volume levels it seemed as if both might launch themselves into the room at any moment (btw I ended up buying no subwoofer because my car's brake system needed a major overhaul soon after this audition ).

[null object]

So a line array running 4 inch drivers each with a woox passive radiator behind it?
Could a line array benefit from a passive radiator?

[18Hurts]

Originally Posted by null object

So a line array running 4 inch drivers each with a woox passive radiator behind it?
Could a line array benefit from a passive radiator?

Sure, a line array will benefit from a passive radiator if the drivers are meant to be ported. A passive radiator acts like a port in that it resonates at a specific frequency but uses weights instead of port diameter and length.

Normally, you would run a much larger passive radiator when using multiple small drivers, Polk Audio used 15 and 18 inch PRs with their 6.5 inch woofers back in the 80's.

For a line array, I'd run passive radiators on both sides to keep them in balance. You have to calculate surface area time Xmax for each 4 inch speaker then calculate the same for the passive radiator(s) to figure out
what you need. There are calculators online to assist you in all those calculations but a rule of thumb is if you run say a 15" with 10mm of Xmax, you'll need two 15" PRs (or an 18" PR) with at least 1.2 times of Xmax of the active drivers.

I'm running a 15" active woofer and an 18" passive radiator that has 37mm of Xmax (74mm peak to peak) for example.

[River757]

A passive radiator acts like a port in that it resonates at a specific frequency but uses weights instead of port diameter and length

I don't want to nit-pick, but just wanted to add that it's the air mass in a port that does what a P.R. does, and the length & width of the port is what determines the amount of that mass.

Carry on!

[18Hurts]

True,

In space neither of them will work either.

Now for somebody to take a waterproof speaker with a waterproof passive radiator and make a sub for the pool...