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Fully adjustable three-way active crossover
Fully adjustable three-way active crossover
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Old 30th August 2017, 05:33 AM   #1
Tromperie is offline Tromperie  Australia
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Default Fully adjustable three-way active crossover

In the September 2017 edition of Silicon Chip magazine (an Australian hobby electronics magazine), there is an article on a fully adjustable crossover using ganged pots to vary the xover frequencies.

For those who might not want to go the digital option, this may be an attractive option;

Fully adjustable, 3-way active loudspeaker crossover Pt.1 - September 2017 - Silicon Chip Online

Last edited by Tromperie; 28th November 2017 at 03:19 AM. Reason: I can't be bothered posting only for some to reply before reading.
 
Old 1st September 2017, 10:34 AM   #2
Boden is offline Boden  Netherlands
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Varying x/o points will still not deliver the desired behaviour of any x/o filter: if it cannot correct non-flat SPL's it will simply not work properly. Acoustic slopes, that is driver+filter, not simply electric, is what any serious loudspeaker designer should be after.

Still, curious to see what the designer comes up with anno 2017. It has to be nothing less than spectacular to be able to compete with digital.

Any schematics available?

Eelco
 
Old 2nd September 2017, 01:27 AM   #3
Tromperie is offline Tromperie  Australia
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Boden,
Did you look at any of the article, the PCB, or the introduction? Do you believe your points would not have been addressed?
Did you read this, "For those who might not want to go the digital option, this may be an attractive option;"? Did you not read that the article is pay for view?
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Source: Daphile on old PC from the tip * Storage NAS: FreeNAS 11 * Pre-amp: DIY PGA2310 * Amps: 8 x LM3886TF
Xover: 24dB @ 300 and 3,000Hz * Speakers: DIY design CNC cut 54 laminations * Drivers SB 10", SB 5", VIFA 1" VTG
 
Old 2nd September 2017, 08:43 AM   #4
Boden is offline Boden  Netherlands
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Simple answer: No, I do not pay for such publications. This DIYaudio. Usually info is shared here on a free for all basis.
 
Old 2nd September 2017, 08:46 AM   #5
Boden is offline Boden  Netherlands
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And furthermore: for the time being I rest my case.
 
Old 2nd September 2017, 08:53 AM   #6
scottjoplin is offline scottjoplin  Wales
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It doesn't mention any correction, I presume it's most probably a simple active crossover based on Sallen-Key active filters
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Old 3rd September 2017, 01:15 AM   #7
Tromperie is offline Tromperie  Australia
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Boden,
You don't have a "case". I shared information so that everyone could make a decision on whether it might be of some use to them.

scottjoplin,
The crossover allows for level settings for a whole band but not for non-flat responses. Apart from inserting individual filters, analogue crossovers do do that. I am always fascinated that some choose non-flat drivers.
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Source: Daphile on old PC from the tip * Storage NAS: FreeNAS 11 * Pre-amp: DIY PGA2310 * Amps: 8 x LM3886TF
Xover: 24dB @ 300 and 3,000Hz * Speakers: DIY design CNC cut 54 laminations * Drivers SB 10", SB 5", VIFA 1" VTG
 
Old 3rd September 2017, 09:20 AM   #8
Boden is offline Boden  Netherlands
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I do have a case.

Quote:
The crossover allows for level settings for a whole band but not for non-flat responses

Now that was the whole point of my first reaction.

Time to move on.
 
Old 3rd September 2017, 09:24 AM   #9
scottjoplin is offline scottjoplin  Wales
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It's for experimenting or PA use, not hi-fi, why else would you want to adjust the xover frequencies?
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Woofer Assisted Wideband is the New Testament renounce the anachronistic acronym FAST
 
Old 3rd September 2017, 10:26 PM   #10
Tromperie is offline Tromperie  Australia
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@Boden
Another for the list. I wish people would make comments relevant to the thread.
__________________
Source: Daphile on old PC from the tip * Storage NAS: FreeNAS 11 * Pre-amp: DIY PGA2310 * Amps: 8 x LM3886TF
Xover: 24dB @ 300 and 3,000Hz * Speakers: DIY design CNC cut 54 laminations * Drivers SB 10", SB 5", VIFA 1" VTG
 

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