I don't know why you'd want to exactly clone the LS5/9 as it is quite an old design. Modern drivers could potentially get you a better result with a less complex crossover. Go through the BBC research papers and take the best of the ideas, certainly - maybe also look at the work Harbeth are doing.
In any case, without a reference for voicing the crossover you'd never get all the way there. The BBC models are assessed against a reference before a licence is issued.
In any case, without a reference for voicing the crossover you'd never get all the way there. The BBC models are assessed against a reference before a licence is issued.
Harbeth have worked wonders in updating the LS5/9!
6moons audio reviews: Harbeth M30.1
Nobody, especially Alan Shaw of Harbeth is going to give away the many design features of the BBC sound, but I've already suggested a good modern SEAS polycone. Tweeters are a matter of taste and debate, but Harbeth use a metal SEAS unit on a complex crossover. Cabinets are thin wall ply for sure.
I can suggest no finer reference than my own on thin wall construction:
http://www.diyaudio.com/forums/multi-way/223174-interesting-read-i-found-lossy-cabinet-designs-harbeth.html#post3234256
8" bass and tweeter is a delightful combination done right. KEF did it years ago to near perfection, although you can adjust this circuit considerably, it is the right idea:
6moons audio reviews: Harbeth M30.1
Nobody, especially Alan Shaw of Harbeth is going to give away the many design features of the BBC sound, but I've already suggested a good modern SEAS polycone. Tweeters are a matter of taste and debate, but Harbeth use a metal SEAS unit on a complex crossover. Cabinets are thin wall ply for sure.
I can suggest no finer reference than my own on thin wall construction:
http://www.diyaudio.com/forums/multi-way/223174-interesting-read-i-found-lossy-cabinet-designs-harbeth.html#post3234256
8" bass and tweeter is a delightful combination done right. KEF did it years ago to near perfection, although you can adjust this circuit considerably, it is the right idea:
Attachments
on 8ohm woofers and possibly 6-8ohm tweeters that will cause significant dip on crossover TF
Interesting read Steve, thanks.
On the Linkwitz site is his 1978 Wireless World article describing his first speaker design. The smaller enclosures used thick solid wood walls. By the time the piece was reprinted in Speaker Builder in 1980 he was getting better results with 6mm ply walls heavily damped with tar.
SB1980-3way
On the Linkwitz site is his 1978 Wireless World article describing his first speaker design. The smaller enclosures used thick solid wood walls. By the time the piece was reprinted in Speaker Builder in 1980 he was getting better results with 6mm ply walls heavily damped with tar.
SB1980-3way
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