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First Order Crossovers: Pros and Cons

I wonder if some folks might share their expertise on the question of crossover design. I'm coming around to the view that this is perhaps the most significant element of speaker design yet I really know very little about it and don't really understand the basic principles. Several of the speakers I have heard in my quest for full range floorstanders are "first order" designs. I have really enjoyed their sound but do not know if this is attributable primarily to the crossover design or to a combination of other factors as well. In addition, I have heard that, for example, because of the use of this crossover configuration on the Vandersteen 5 one has to sit at least 10 feet away from the speakers in order for the drivers to properly mesh. Is this really true and if so why? Another brand also in contention is the Fried Studio 7 which also uses a first order design. Same issue? Could someone share in laymans terms the basic principles of crossover design and indicate the advantages and disadvantages of each. Also, what designers are making intelligent choices in trying to work around the problems associated with crossover design? Thanks for your input.
128x128dodgealum
skrivis
30 posts
 
There's some disagreement on the benefits of series vs. parallel. I feel series is superior, but I'm not the last word on things. :-)

You can find a fair bit of info on the net about series and parallel crossovers. Rod Elliott has some good info, for example. http://sound.westhost.com/parallel-series.htm

I don't see that you can say that either the W/M or M/T interface is more important. Both will affect the operation of the mid driver, and that's where your ears are most sensitive.

I don't know enough about the Heil to render an opinion, sorry.
gregm
3,405 posts
 
As per Skrivis, my own (unsollicited) opinion would be slightly in favour of a series -- IF you can easily get the drivers' electrical parametres VERY close (or near identical). Again, I'm just a hobbyist -- not a professional.

As to the Heil, 3kHz seems quite high -- which model are you using? As I know nothing about the Peerless, I really can't offer an opinion as to that particular match.
However, the Heil is dipole, so are you considering a 3-way with an open baffle mid -- or are you going closed cab after the Heil? If so, getting your system radiation pattern acceptable 3kHz downward could be a bit tricky!

ASAIK, the guy who makes "Heil" speakers crosses his AMT's about two octaves lower onto an upward firing peerless (quite a big unit if I remember correctly...). Frankly speaking the result is excellent down to the peerless: then things get a bit messy BUT that's just my opinion.
Cheers
Cheers
gregm
3,405 posts
 
Ooops, no "edit" function anymore. Well, the BIG Heil is dipole, of course, the other one has a back chamber...
trelja
3,223 posts
 
Skrivis, I must applaud you on the link you provided!

Also, along with the series crossover being "self correcting" in terms of driver variation, it exhibits the same characteristics for variances in the crossover components. For example, as we know, using a 5% capacitor in the network can result in a fair bit of variation from speaker to speaker. While painstaking matching of all components is a solution, the cost effects (time, testing, and parts) cannot be dismissed. The series network yields some very positive advantages here.

However, as the article points out, in the end, there is no free lunch. But, we have always known that and come to this conclusion for a lot of things. Otherwise, there wouldn't need to be much variation in crossover design.
skrivis
30 posts
 
Rod puts a lot of thought into the articles he writes. :-)

I feel series crossovers are better than Rod makes them out to be, but they're not the greatest thing to ever happen to speakers - as some people claim. :-)

Bud had an article that he was making available that contained a summary of his knowledge on series crossovers. However, I was told that this (and other) articles are no longer available. Perhaps someone will make it available on the web so I can read it.

Where I disagreed with Bud (and the current Fried Products) is the claim: "Properly implemented series networks provide superior driver coherence, increased dynamic range and introduce a Doppler effect similar to live music that increases the sense of realism."

"Doppler effect?" Sounds like pseudo-science to me, and it also would qualify as distortion if it exists.

Perhaps it simply strikes me as odd because DiAural were making some unfounded claims about "Doppler" effects, but they were using series crossovers to reduce them. :-)

Nevertheless, I'd like to see some proof for this "Doppler effect" and how it "increases the sense of realism."

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