fullrange cabinet design help

[Hons Gruber]

Hi,
I am planning on building a 2.1 system with two full range monitors. I am planning on using the Tang Band W3-1335SB. So my plan is to have one speaker per box. I would also like it to be a passive a radiator system though. The Tang Band has a matching PR for this driver which is the W3-1335A. I have heard when you have a passive radiator it should have 1.5x-2x the surface area at least. So I would be using two Pr in each speaker. I was going to possibly use this design at Design of Zaph's W3-871S Fullrange Monitors, but now I don't know what the PR's would do to the cabinet. So if anybody could help me design a cabinet that uses the pr's effectively or knows a link to one that would be great. The sub I am building has an 8" driver and two 8" pr's and that will be in a 19 liter cabinet so maybe I could just make the design smaller and use it for my fullranges? here is the sub design I'm using.
Wyse
peace,
Hans

[chris661]

Why would you like it to be passive radiator?
The effect of adding them is similar to adding a reflex port, but seeing as you're crossing over to a subwoofer, I see no reason to extend the LF response of a driver that won't be playing those frequencies.

[Hons Gruber]

They won't always be used with sub and I'm not planning on putting in a crossover, but if you thinks its a bad idea to put them I guess they are not totally necessary. I also would like the sub cross over not to be too high and I am guessing the PR's will help extend the frequencies of the 3' a little bit or at least help it be able to hit lower notes in its frequencies better.
peace,
Hans

[LineArray]

In my experience there is one advantage with passive radiators:

If the PR has a rigid and well damped membrane it will have
less unwanted radiation in the midrange and there are no port
resonances.

So for 2-ways or fullrangers a PR is an interesting option, though
i seldom used them.

Kind Regards

[chris661]

What will the cross-over point be between the subwoofer and the satellites?

[Hons Gruber]

I'm guessing between 100-110hz. Thats another reason I want to try the pr's to try something a little bit different. The speakers I have seen with pr's are all sub and they are all the same size as the driver. I have never seen them in full ranges before. Just wondering if I should kind of cube them like the4 sub is or stick with that design for cabinet size.
peace,
Hans