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Old 31st July 2012, 03:17 PM   #1
tbone01 is offline tbone01  United States
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Default Picking crossover points

Hello,

I am building my first pair of two way standmount speakers and was wondering if using an active crossover is a good way to pick passive crossover points?
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Old 31st July 2012, 08:15 PM   #2
tvrgeek is offline tvrgeek  United States
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It is how I start to get a feel where I am going. ( DCX) Even if you do, never forget to put a big blocking cap in series with the tweeter. Of course, it is not a simple translation, but it does tell you a lot about the drivers. In other words, if yo find a wonderful result at 2K 2nd order, don't expect to build a calculated 2K crossover in passive. You have to deal with the driver impedance.
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Old 1st August 2012, 10:05 AM   #4
AllenB is offline AllenB  Australia
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The better way to choose a crossover point for drivers is to study their features. Sometimes listening tests will help to reveal something that wasn't obvious in one of the drivers but this alone may or may not be an acceptable reason to shift a crossover point.
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Old 1st August 2012, 02:15 PM   #5
tbone01 is offline tbone01  United States
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I think I will abandon the idea and do it based on measurments.
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Old 1st August 2012, 02:25 PM   #6
gedlee is offline gedlee  United States
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I think that it depends on the "how" you will use to decide the crossover point. If you measure the polar response for different crossover point and find that one which yields the best polar response then this would work. Although translating that to passive can be difficult. If you have an active crossover and are only making a set for yourself then just stay with the active.

But do not use an active unit to detenrmine the crossover point by listening. It would be shear luck if that worked.
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Old 2nd August 2012, 12:20 AM   #7
tbone01 is offline tbone01  United States
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Earl,

Would the polar response be the same with an active or passive configuration or just pretty close?
I read that the dispersion at the crossover point between the tweeter and midrange should be close to the same would you agree with that?
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Old 2nd August 2012, 03:08 AM   #8
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Quote:
Originally Posted by tbone01 View Post
Hello,

I am building my first pair of two way standmount speakers and was wondering if using an active crossover is a good way to pick passive crossover points?
There is more to crossover design than just picking frequency points to divide the audio spectrum into segments. To fully explore the signal conditioning requirements for each driver, recommend use of digital crossover implemented on a computer with a sound card. Such an arrangement will allow filter slope, frequency, output level, phase, and delay and response equalization to be easily adjusted. Once marriage of the drivers has been optimized, then a decision can be rationally made as to whether use of passive components is an electrically feasible, economically attractive and acoustically acceptable alternative.
Regards,
WHG
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