Variable frequency active crossover - Page 3

Key · 4th July 2009, 04:18 PM

I think derrived crossovers work for certain things really well. Like processing where you recombine the entire spectrum before the output.

But don't they swell up on the subtracted side if you use more than a 1st order and keep the signals split? Making the driver have to work harder as it gets closer to the crossover frequency.

Bigun · 4th July 2009, 04:28 PM

By it's nature, the subtractive filter is flat, no 'swell-up'. This is also what I saw in my sims (over on the Carlos bi-amp thread) and I think I was getting more than 1st order (didn't measure the slope of the line though)

Key · 4th July 2009, 04:30 PM

I'd double check that. While it is mathematically flat after you recombine the signals the subtracted FR alone will look swolen as you increase the slope of the filter.

4th July 2009, 04:28 PM	#22
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	By it's nature, the subtractive filter is flat, no 'swell-up'. This is also what I saw in my sims (over on the Carlos bi-amp thread) and I think I was getting more than 1st order (didn't measure the slope of the line though) __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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4th July 2009, 04:18 PM	#21
Key diyAudio Member Join Date: Jan 2009	I think derrived crossovers work for certain things really well. Like processing where you recombine the entire spectrum before the output. But don't they swell up on the subtracted side if you use more than a 1st order and keep the signals split? Making the driver have to work harder as it gets closer to the crossover frequency.

4th July 2009, 04:30 PM	#23
Key diyAudio Member Join Date: Jan 2009	I'd double check that. While it is mathematically flat after you recombine the signals the subtracted FR alone will look swolen as you increase the slope of the filter.

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