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Can I make a crossover or buy one?

My son got some small B&W speakers for Christmas and their low end bottoms out around 40-50hz, and if my guess is right it's probably down at least 3db at that range. So I bought him a passive sub, which is nothing more than a 12" woofer in a box. What I need now is a crossover that both combines L&R channels for 100hz and below(or there abouts), but also provides a high-pass for 100hz and above for the B&W's. If I can just buy a unit that will do all that I would probably just fork out the bucks but I can't find one. Twenty years ago or so I went to an electronic trade school (while trying to find myself), but have forgotten just about all I learned. But if someone had a schematic I may be willing to try. So if you know of a brand/model that will accomplish this or have a design could you let me know?Thanks, Jim
jimmymaclite
bob_bundus
1,834 posts
 
some sub's have integral adjustable crossovers built in that will take care of all this for you. They are even tunable for best integration; get one with a phase adjustment for even better results.
ljgj
955 posts
 
Go to your local pro music shop - they may have what you are looking for - Rane brand comes to mind or even less expensive stuff they keep around to sell to DJ's.
twl
3,251 posts
 
Your best bet is to get an active adjustable crossover and separate amp. To make a passive crossover for your existing sub, you will need the comprehensive spec sheet on the driver and then run calculations on the box to determine the system Q and any other effects the box may have on the driver. In addition, low frequency passive crossover networks are the most expensive ones to make, so it would not be a "cheap" experiment.There may be an active crossover "kit" out there, if you look around on the web, and if you're handy with a soldering gun.
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