Can you recommend a driver for small passive BR
 

I'm hoping to supplement a small line array and I'm looking ideally for an 8" driver that can be used in a compact < 25L ported enclosure.

It will be part of the same speaker so used passively. All I've managed to find is a 6.5" Vifa that may be suitable.

Any easily available to the UK would be proffered. I may consider an isobarik arrangement to reduce size but driver cost must be lower as I'd need 4!

Appreciate your help.

Hi smallangryboy,
What to look for. Does dB's plays an important role in your design?
The Vifa P17WJ-00-08 is good. It plays VB = 20.3 L, FB = 33.7 Hz, 84.8 dB/2.83V/m, F3 = 49Hz
SB Acoustics SB17NRXC35-8 6"
HiFi DIY products and accessories - Speaker drivers - sidekick-audio.com
Tang Band W8-1363SBF 8"
Tang Band W5-1685 5"
SCAN SPEAK 15W/8530K01 "Revelator" 6"
SEAS H1192-08 CD22RN4X 8.5"
BEYMA CM8B v.2011 8"
Eton 7-200/A8/32 Hex 7"
Peerless 830875 Nomex 6.1/2"
Peerless HDS PPB 830875 5"
Wavecor WF182BD01/02 7" (examples)

Brilliant, thanks lots to look at :)

In answer to your question, it's in a modest room, semi detached house, approx 3m x 5m x 3m so not ear shattering levels by any means.

Hi,
I don't mean that, but don't you have to match the dB's to your passive system?;)

Sure, you'd have to attenuate the tweeter/array with a crossover to match.