Type of crossover ??

BrocLuno

BrocLuno

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OK, one of you guys that really knows tis stuff, help me out here. I rebuilt my RS-3000's, am looking for more - maybe RS-4000's or if I can find them 5000's (then I'm in EMIT country). I downloaded the schematics for all three from the Infinity.DE site. I worked over my crossovers, but I don't really understand the "type" of crossover used? It's not Zobel, not 3rd order? Someone please explain it to me, I'm having a senior moment :yes: :scratch2:
 
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Broc,

I'm not an expert in this either, but I'll take a stab at it :D

The cap and resistor in parallel with the woofer is a Zobel per this:http://www.lalena.com/Audio/Calculator/ImpedEqual/Help.aspx

The inductor is the 1st order low pass filter on the woofer.

Tweeter has a 2nd order high pass filter. The resistor in series just attenuates the output I think, but not sure. A proper L-pad would have a resistor in series and in parallel, which would be better I believe.
 
As Ken has covered the 3000, I'll take a stab at the other two.

For the RS-4000, the woofer has a 2nd order (12dB/oct slope) low pass filter. The midrange also has a 2nd order high pass filter, a 1st order low pass (near as I can figure it) with a Zobel network following, or if you want a little terminology variety, call it a Boucherot Cell. The EMIT is hooked up with a 3rd order (18dB/oct), which catches me a bit odd considering the lobing issues associated with that topology. Then again, I'm not too good at this and so prefer active (if I could ever go that way).

The RS-5000 switches back to simple 1st order crossovers on all three drivers with Zobels on the woofer and EMIT.

That is, according to the crossover schematics provided on Infinity's old technical sheets currently hosted by Infinity-Classics.de. Information on those sheets has been found faulty and these schematics could be switched around some as it catches me as fairly odd to have such varied crossover topologies for speakers in the same series. (I have seen information listed for one model that was originally from an entirely different model.)

- JP
 
Thanks,

I thought, as I worked mine over, that part of the sound of these speakers was a sound "profile" controlled by the crossover. Not just a simple roll off, but an envelope for each driver. Your explanations make sense and a bit more clear. There is definitely some higher order engineering going on here?
 
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