Do most manu. buy or build their x-overs?

Don't see that it would make much of a difference as I assume that most crossovers are spec'd by the designer(s) of the speakers. Who actually makes them (as long as a high level of QC is maintained) would be a mute point.

I have heard of one or two designers who specifially matched the crossover components to each/every individual driver (to compensate for slight variations between like/otherwise matched drivers when they are actually in use), but don't recall names/models.

Does anyone know of them?

The labor cost involved in doing this would seem to be a bit crazy, but if such speakers were used in the near field by someone with good/balanced hearing I suppose that their would be an audible benefit.

My old Rogers Ls3/5a's were said to have the drivers (per pair) matched with extreme accuracy (the crossover parts as well), but this was back in the late 70's when labor costs were considerably more favorable for the manufacturer.

They did perform quite well in the near field (my hearing, ear to ear, was also better matched back then).

Crossover design is very critical. That's why most of us don't try diy designs. We can all get high quality drivers and build good boxes but the crossover is a major component. You can't just slap a crossover in from some chart, it's much more complex. Go to the Parts Express diy site and ask there. Lots of knowledgeable people. I was ready to build a world class speaker. Bad idea, trust me. I've done much research and it's not nearly so simple as it appears if you want your speaker to sound good.

I've always assumed that speaker manufacturers design their crossovers and outsource the actual manufacture of the boards. Somebody like B&W probably does it all start to finish but many smaller companies would probably find it more practical to have them built........maybe in China.

Warnerwh...Crossover design is important but you don't need to be a genius to do it. A couple of points.

1. It makes a lot of difference what kind of crossover you have in mind: 2-way/3-way, cossover slopes... A 2-way 6dB crossiver is not complicated.

2. There are computer programs that will give you a crossover design specific to your choice of drivers, and enclosure. You don't need to buy the software and/or computer, because Madisound will run this design program for you for a modest fee. You may want to tweek the design to suit your own tastes, based on listening, but the original design will be 95% there.

I do not know of a "high-end" speaker manufacturer who does not design their own crossovers- this would include Enregy, B&W, etc. They may contract to have each particular model's boards built, say in China, out of certain brands and certain tolerances...

The smaller boutique brands, Sonus Faber, von Schweikert, Coincident, etc. measure their raw crossover parts to achieve the "design-prototype" blueprint values very closely.

An example would be a tweeter crossover that needs a 10.3 microfarad capacitor, with +/- .025 microfarad deviation. The problem is that, unless you order 1000+ and can tolerate a long lead time, you cannot order a 10.3 value, only a 10.0 value, with a far higher +/- 0.5 microfarad variability (= 5% tolerance).

So a 10.3 value, +/- 0.025, takes a tested "10.something" and a tested "0.3something" in parallel, with the same two values used in the other speaker, for matching pairs.

You can't purchase worthwhile pre-made crossovers unless they are designed specifically, as in a kit, for a certain woofer, mid, etc.

Best,
Roy Johnson
Green Mountain Audio