In Reply to: crossover for Altec 604-8G posted by billfort on October 23, 2001 at 13:39:15:
I expect that compensation would be appropriate, but without a response graph, it's hard to say what kind. And as for crossover slope, first order is probably fine but I would be surprised if second or third order wasn't better. Crossover frequency would be dependant on the characteristics of the two drivers.Without any information or specifications, I'd probably make the tweeter circuit something like the second or third order networks shown on my crossover document. Page 53 shows a good second order with compensation and pages 61 and 64 show good third order networks with compensation.
Since the tweeter and woofer are physically close, you'll probably want a symmetrical crossover but again, it's hard to say without measurements. Woofer specs are important for knowing which of these networks is optimal, and tweeter/horn specs are important for knowing what values should be chosen for R1, R2 and C3. Judging from what you've said, I'd probably start with 8-12 ohms R1, 30 ohm R2, and 0.47 to 1.0uF C1.
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