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Old 5th December 2012, 06:15 PM   #1
mortron is offline mortron  Canada
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Default Active Crossover for Open Baffle 2-way

Hello,

I'm planning to DIY an active XO for my open baffles, an 8" full range Visaton B200 and an as of yet determined bass running about 200hz and down. I had a few questions pertaining to Active Crossovers and a bit of EQ. I am seriously considering this project:

Linkwitz-Riley Electronic Crossover

Has anyone had much experience with this crossover? From what I gather, this offers no phase inversion?

I am also interested in this because I am also keen on the subwoofer equalizer kit on his site to tweak the bass in a bit more on the OB.

Would anyone suggest any alternatives to this kit? I have seen the B1 Crossover thread, and the Pete Millet preamp, but they may be a little more work than I am prepared to do at the moment. I am new to Active Xo's, complex DIY, and the old John Pomann Crossover Experimenters kit is no longer available. Thanks
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Old 5th December 2012, 06:26 PM   #2
adason is offline adason  United States
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I normally select 160-170 Hz as crossover point for open baffle with subwoofer...that would be my suggestion. Fulrange can easily handle down to 160Hz.
I have had a period when I built numerous active crossovers, always preffered simple transistor based one over the OPA based. Even I use the best OPA I could efford, I have always heard them. I ended up using just passive filter buffered, that sounded best to me on midrange and up. For subwoofer, that is less critical, I used those previously built OPA based crossovers (with high pass not used).
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Old 6th December 2012, 01:44 AM   #3
mortron is offline mortron  Canada
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Quote:
Originally Posted by adason View Post
I normally select 160-170 Hz as crossover point for open baffle with subwoofer...that would be my suggestion. Fulrange can easily handle down to 160Hz.
I have had a period when I built numerous active crossovers, always preffered simple transistor based one over the OPA based. Even I use the best OPA I could efford, I have always heard them. I ended up using just passive filter buffered, that sounded best to me on midrange and up. For subwoofer, that is less critical, I used those previously built OPA based crossovers (with high pass not used).
Would you be willing to suggest any circuits or kits to look at? I understand the reason for crossing at 160hz, but I am sure I will probably play with it some to get a value that works for my room and system.
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Old 6th December 2012, 11:45 AM   #4
adason is offline adason  United States
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marchand makes lots of crossover kits
electronic crossover, PLLXO, passive crossover, active crossover, custom amplifier
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Old 6th December 2012, 11:47 AM   #5
adason is offline adason  United States
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here is something very simple I made
Audio Pages: Simple active crossover
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Old 6th December 2012, 05:46 PM   #6
AndrewT is offline AndrewT  Scotland
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No phase inversion? What about swapping the speaker leads over?
The Linkwitz site offers almost everything you could ever need in the way of information to design and build your own analogue active filters.
At my level of knowledge I do not know of anything that is omitted from the Linkwitz site. Except maybe D.Self's book.
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Old 6th December 2012, 09:48 PM   #7
Telstar is offline Telstar  Italy
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Something adjustable such as the firstwatt B4 or the Bryson 10B...
Self's book is very good (I'm reading it) and should be enough if you are willing to go with opamps (like Linkwitz does btw)
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Old 6th December 2012, 11:15 PM   #8
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by adason View Post
I have had a period when I built numerous active crossovers, always preffered simple transistor based one over the OPA based. Even I use the best OPA I could efford, I have always heard them. I ended up using just passive filter buffered, that sounded best to me on midrange and up. For subwoofer, that is less critical, I used those previously built OPA based crossovers (with high pass not used).
Which opamps did you try?
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Old 8th December 2012, 12:59 AM   #9
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The P09 filter boards are a good introduction to active xover. They can be somewhat flexible for building Sallen/Key style filters of various orders, once you learn more about how filters are configured. ESP does not provide much theoretical info; that must be learned elsewhere. The documentation supplied is sufficient to build the kits with various configurations and values.

The filters are only as good as the parts you use. Rod does not believe AT ALL in boutique parts. He is a strict objectivist. I believe you can use better parts than he recommends and get better sound, but not better measurements. One point we do agree on is that accuracy of matching part values within the circuit and between channels is essential. You should invest in an LCR meter or expect to pay a lot more for parts already closely matched.

The boards themselves are acceptable quality, nothing special, perfectly fitting Rod's objectives of doing only what is necessary and no more. The pads can lift easily, or be easily twisted off the board by the slightest force on soldered components or wires. He sells pins that fit the input/output pads, or you can buy them from a parts supplier when you get your parts. They will serve to make the off-board connections a little more secure. Almost anything that hangs loose from the board will eventually lift the pad it's attached to if any force is applied.

You will need a power supply. The one ESP sells is adequate.

Experimentation is awkward unless you use sockets so you can change out components to trial different xover configurations instead of desoldering/resoldering. If I had it to do over again, I might start with DSP and then use the results of testing to build these kits once or, at most, twice. If you know exactly what you want in advance, then go ahead and build the kits. All in all, they're pretty easy and work as advertised, and are a decent value. Consider buying a spare board in case you screw one up, or if you want to experiment with two different configurations without modifying either.

Peace,
Tom E
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Old 8th December 2012, 02:53 AM   #10
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For what you will pay for boards, parts, power supply, etc. you can just buy an entry level pro crossover and some adapter cables. For instance dBx 223 is worth a look, or for a peg lower on the quality notch a Behringer CX2310.

If you want to roll your own I strongly suggest using the Marchand XM1 crossover boards. Good quality and swappable corner frequency.

-Charlie
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