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Old 21st May 2008, 01:33 PM   #21
pjpoes is offline pjpoes  United States
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Part of why I stuck the BSC there is cuz I can't get speaker workshop to model the BSC correctly where its supposed to go. I know its supposed to pad down everything, tweeter and all, but, as an example, if I stick it where it goes, the inductor seems to have no effect, as if its not even connected, and the resistor excessivly pads down everything, on the order of 6-12 decibles, across the board. Works fine in the other crossover designer, just not this one, for some reason. not sure, maybe its just this crossover.
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Old 21st May 2008, 02:00 PM   #22
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Did you try connecting it Source--BSC--LP--Driver?

Did you try bumping the first inductor up to say 1.2 and see how that looks? (without the separate BSC circuit). You will have to adjust other values to hit the target XO.
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Old 21st May 2008, 03:39 PM   #23
sreten is offline sreten  United Kingdom
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Click the image to open in full size.

Hi,

The above crossover has BSC and is 4th order Linkwitz / Riley acoustic.

I'd say your crossover is too complicated.

/sreten.
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Old 25th May 2008, 05:26 PM   #24
pjpoes is offline pjpoes  United States
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this does not model is an LR4 on my computer, are you sure? I put in the LR4 slope as a goal, tried your values, and did not end up with a propper 4th order roll off. I ended up with 2nd order roll off.

I dont agree that its too complicated, most of the components are in parallel, not series. those that are in series will be expensive to keep pure sound, and I can of course attempt to develop a simpler system with good rolloff. None the less, I think the tweeter works better and sounds better with the LCR trap. I also prefer the shaping I recieve from a propper L-pad, rather than just a series resistor. Without it, I think the tweeter tips up too much.
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Old 25th May 2008, 05:43 PM   #25
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Quote:
Originally posted by pjpoes
this does not model is an LR4 on my computer, are you sure? I put in the LR4 slope as a goal, tried your values, and did not end up with a propper 4th order roll off. I ended up with 2nd order roll off.
Are your driver models realistic or straight 8R impedance/ flat response?
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Old 26th May 2008, 11:54 AM   #26
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I checked it on basta! software but I can not make a screen capture. The low pass filter seems good with the volumes for the box (Vb/vented) in the specsheet for the Focal 6W4254. The xover region on this graph (software with xover comps.) is more close to the 1500/1800 max. region. Roll-off is very high here and I didn't check anything else (tweeter) besides this.

Also (always) invert the polarity of the tweeter for a 2. order xover, if not active.
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