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Old 8th August 2007, 12:07 PM   #1
Skorpio is offline Skorpio  Denmark
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Default Active combined with passive XO

I have a 2-way system with active 12db/Oct. LR LP-filter on the bassdriver and passive 6dB on the tweeter. XO is 2KHz....

Drivers are timealigned on front

Qustion:

How to phase the drivers? It sounds best with normal on bass and reversed on tweeter, but not much different with normal on both (perhaps not good phase tracking?)

If I changed the tweeter filter to 12dB, how to phase drivers?


How is a reverse null audible? It should be placed at 2kHz.....what to listen after and what kind of music?
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Old 8th August 2007, 02:16 PM   #2
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Default Re: Active combined with passive XO

Quote:
Originally posted by Skorpio

If I changed the tweeter filter to 12dB, how to phase drivers?

Skorpio, if you use a passive xover w/ a second order (inductor + cap) xover for the woofer and a second order (inductor + cap) for the tweeter you must reverse phase in one of them, so they will not be +90 and -90 out of phase, the same as 180.
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Old 8th August 2007, 02:21 PM   #3
sreten is offline sreten  United Kingdom
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Default Re: Re: Active combined with passive XO

Quote:
Originally posted by Inductor


Skorpio, if you use a passive xover w/ a second order (inductor + cap) xover for the woofer and a second order (inductor + cap) for the tweeter you must reverse phase in one of them, so they will not be +90 and -90 out of phase, the same as 180.

Hmmm....... Unless the drivers are perfect completely wrong in terms of must, /sreten.
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