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Mixing slope types?
Mixing slope types?
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Old 13th July 2012, 07:58 PM   #1
nonsuchpro is offline nonsuchpro  United States
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Thumbs up Mixing slope types?

Hey all,
What are the advantages/disadvantages of mixing slope types? I can do this on my Ashly electronic crossover but really am wondering if it is done with passive crossovers much. For instance... use a Linkwitz-Riely slope on the woofer and then a Butterworth on the tweeter

C2 = 5.53 uF
L2 = 1.41 mH

C1 = 7.81 uF
L1 = 1 mH

Thanks in advance!
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Old 15th July 2012, 12:45 AM   #2
Speedskater is offline Speedskater  United States
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Often a driver has an acoustic roll-off near the cross-over frequency. That roll-off counts as part of the slope.
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Old 15th July 2012, 12:59 AM   #3
5th element is offline 5th element  United Kingdom
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Well as speedskater says the drivers own frequency response contributes significantly to the final acoustic result.

When discussing xover types one usually is talking about the acoustic response, that is the drivers own natural response + what the electrical filter adds to it.

In terms of loudspeaker design what the electrical filters are doing is rather academic, it is the final acoustic result that we are interested in. Say for example a 4th order Linkwitz Riley (Q = 0.5) target at 2Khz, this might actually require a second order electrical filter with a Q of 0.3 at 2.2kHz. The filter isn't interesting, the result is what is.

Now of course the filter is interesting if it doing something that you'd rather it shouldn't, like lowering the input impedance too low, or, in the case of active filters, creating areas of very high gain that could cause your amplifiers to clip and your drivers to explode.

Now with regards to combining different acoustic targets, this happens a lot where you will see a designer using asymmetrical slopes. This is generally done to ensure that the drivers of a system sum correctly with respect to their phase alignment.
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Old 22nd July 2012, 03:16 PM   #4
tvrgeek is offline tvrgeek  United States
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What 5th said. As usual.
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