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Old 17th November 2012, 04:00 AM   #1
Beer30 is offline Beer30  United States
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Default Active crossover component suggestions?

I'm thinking of taking a double dip into bi-amping and active crossover design!

I'm looking for suggestions on the active components that are:

- relatively forgiving
- of reasonable quality
- inexpensive (good value per US$ given the above considerations)

If such a beast exists. Opamp, transistors or some flavor of FET, I'm open to suggestions.

Right now I've got a chip amp with some full range speakers that I'm quite happy with. I'm thinking of throwing together a sub for the above mentioned setup.

I'm looking to get my hands dirty. If it actually works, bonus!

Here is my plan: Active Filters

Anyone have a favorite?
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Old 18th November 2012, 07:02 AM   #2
andyr is offline andyr  Australia
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Quote:
Originally Posted by Beer30 View Post
I'm thinking of taking a double dip into bi-amping and active crossover design!

I'm looking for suggestions on the active components that are:

- relatively forgiving
- of reasonable quality
- inexpensive (good value per US$ given the above considerations)

If such a beast exists. Opamp, transistors or some flavor of FET, I'm open to suggestions.

Right now I've got a chip amp with some full range speakers that I'm quite happy with. I'm thinking of throwing together a sub for the above mentioned setup.

I'm looking to get my hands dirty. If it actually works, bonus!

Here is my plan: Active Filters

Anyone have a favorite?
Your link was to SL's site. You might like also to look at Rod Elliott's site "ESP", here: Elliott Sound Products - The Audio Pages (Main Index)

Go into "Projects" and look at P09 and P81. I use these in my 3-way active Maggie setup.

Re. what actual components to use - that's entirely a matter of how much you want to spend. My own are built with Beyschlag metal film resistors but the electros are Black Gate and the film caps are RelCaps. I used AD826 opamps - simply bcoz I read about 10 years ago that these gave good bass (in a comparison with others).

BTW, IMO Siegfried's design are complex - Rod's much simpler. Which is the better one for you depends on what style of speaker you are turning active. In my case, Magiies just need simple HP/LP filters - so Rod's circuit is ideal.

Good luck,

Andy
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Old 18th November 2012, 08:07 AM   #3
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If you are just going to go with a sallen-key 2nd or 4th order then you won't need any large value caps, I've used vishay MKP-1837 caps in my prototype active crossover. They are good quality, suitable for this type of circuit and their tolerance is very good.

I went with a mixture of vishay dale cmf55, cmf60 and welwyn 0.1% resistors (as local suppliers don't stock all values in any particular series), which is probably overkill but I wanted to make sure that there were no channel to channel differences.

Tony.
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Old 18th November 2012, 08:37 AM   #4
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My best advice is to buy many more passives than you need, then just match yourself. Consistency between stages and across channels is much more important than exact matches to nominal values that simulators pump out.
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Old 19th November 2012, 07:33 PM   #5
Itsmee is offline Itsmee  England
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I like Rod Elliot's 2 way 24dB Linkwitz Riley project.

Linkwitz-Riley Electronic Crossover

But personally I don't like opamps, instead I would use Nelson Pass style B1 buffers.

B1 Active Crossover

I'm toying with the idea of using a cascoded version of the buffer used in the F4, that way I can get a large voltage swing straight into a BA2 output stage, that way I only need one gain stage before the crossover, rather than one stage each for the low and high sections.
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