Hey all,
I have had some 70s JBL and older Altec stuff in my basement for a while and have decided to make some use of at least some of it. I would like to make a pair of studio monitors in the vein of the 4333. The items that I have are live reinforcement gear (E130 guitar speakers, E140 bass instrument speakers, 2461 small format compression driver, Altec 811 horns, Altc 808-8A drivers). I want to use some of what I have. While I don't think the 2461s are as refined as the 2420s that are used in the 4333 I am sticking with them and the plastic horns
that I have for the time being. I also went ahead and ordered a pair of 2405 tweeters on ebay a couple of days ago. So those things are givens for now.
The unresolved issues are the crossover design and the bass drivers.
Bass drivers:
On paper the 2231a seems to be a good woofer for this job. It gives a low 30s F3 with the box design and was the driver in the 4333 originally. I have seen postings that say that it was improved upon considerably by (?) the 2235 (I think). I think I’ll need a driver that can cover the mid bass up to 800hz (possibly higher) as I am using a compression driver for mids.
Crossover design:
I think that crossover points of 800hz and 8000hz would be about right. I have some design software that gave me a design for a Linkwictz Riley 4th order crossover. It requires so many capacitors and inductors that I think the board would be a foot square. I bid on a pair of the original 3331a crossovers on ebay but they got away (went for about $425.00). Does anyone have a schematic for that crossover and/or for an appropriate crossover for my design.
Any ideas? Also I have had a hard time finding a source for a pair of suitable bass drivers. Any ideas there? I am new to building crossovers but I am probably going to be giving it a try. Any pointers, pitfalls to avoid???
Thanks
Penguin