1. No ad-hominem
2. No spamming or shilling
at the moment i have no firm plans as to what i will end up with so some guidance is needed from you chaps please.
here's the donors,a pair of richard allan pavane speakers.
12inch woofer,8 inch mid and a 4 inch tweeter.
i dont profess to know or understand speaker crossovers or calculations so perhaps it would be best to stick to a 2 way design,i can on the other hand solder,iam also an ex cabinet maker and now im a steel fabricator so making the cabinets is the easy bit lol.
oh and dont hold back if you think the drivers arn't worth the hassle please say so,i had a quick listen and they are very reminiscent of ditton 44's
so what do you think guys?
cube type 2 way?
doc modded drivers?
T&S parameters for some of the drivers here: http://www.diyaudio.com/forums/multi-wa ... ached.html
Your drivers are here http://ukhhsoc.torrens.org/makers/Richa ... index.html somewhere!
Crossover looks quite simple. I don't know if doping is suitable for all drivers, they look like paper. Doc uses Kevlar jobbies but I think people have doped other materials. I have doped aluminium cones but have not got enough on yet so cant say whether it has been successful yet. You can only remove the crossover once the mid & bass have been doped. 12" driver will get you REAL bass and the mid is larger than I have seen. I don't know about the tweeter, technology has come along way as far as tweeters are concerned.
Check out if you can what the cabs are made of and how thick, any bracing ? Maybe steel lining the insides would be worth it and throwing away what ever it is stuffed with. Looks like it has an oblong port ? The doc recommends blocking ports and any air leaks to turn it into acoustic suspension.
Good luck what ever you do. Messing about with speakers is a lot of fun.
yes i realize the tweetesr will have to go,it looks very dated to me as i sit hear looking at the ones in my yamaha ns1000's,
all the richard allan drivers are dated 1968.
re the cabinets , i would like to try the cube type cabinet or omni style with say downward facing bass diver or other variations with that in mind the original cabinets are not needed.
this is of course all ideas floating around in my head so i will wait for the richard to comment as to the best way forward.
I've done a quick sim of the 12 inch driver from the limited data available: It looks like around 15 litres net is optimal, but anything up to 40 looks fine. That suggests to me a two box solution like Stu's might work well: Bass driver at the bottom of say a 40 litre cab (useful floor reinforcement from a slightly overdamped enclosure, upward facing 8 incher and front facing tweeter in smaller top cabinet. It may be worth trying a different tweeter too (e.g. on of the Doc's).
All that said the raw drivers might fetch quite a bit on the world's favourite auction site. I came out comfortably ahead when I sold the drivers from a pair of B&W DM4s (which was stuffed to the gunwales and sounded awful).
ive just read the same wiki article
what did you use to do the sim?
I find these things to constitute "broad guidance" rather than being tightly prescriptive. It just helps avoid putting a driver that needs a really large enclosure into something stupidly small and then wondering why it's all boomy with little definition. This is why the Doc's 8 inch driver works well in the Cube 1s and also a range of other donor cabinets of varying sizes.