Bill Epstein Messages: 1088 Registered: May 2009 Location: Smoky Mts. USA
Illuminati (2nd Degree)
They're more expensive than the Jantzen 15ga. Parts Express sells and Wayne furnishes with the upgraded kit. I didn't take the time to compare the DCRs but that would be the important thing, not that a few ohms makes much difference.
The one sure thing in audible choices is to go with Erse steel core when it comes to deep bass.
Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
We use Erse Super Q (laminated steel-core) coils in the constant directivity cornerhorns - but do not use them in the matched-directivity two-ways. The woofer in the cornerhorns is only used for bass and so an iron core is fine. But the two-ways run the woofer through the midrange, and I suggest air-core coils only for them.
Bill Epstein Messages: 1088 Registered: May 2009 Location: Smoky Mts. USA
Illuminati (2nd Degree)
Wayne Parham wrote on Thu, 07 June 2012 10:07
We use Erse Super Q (laminated steel-core) coils in the constant directivity cornerhorns - but do not use them in the matched-directivity two-ways. The woofer in the cornerhorns is only used for bass and so an iron core is fine. But the two-ways run the woofer through the midrange, and I suggest air-core coils only for them.
Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
Just to clarify: I think Bill's suggestion "to go with Erse steel core when it comes to deep bass" is good, but only when it really is "deep bass". If midrange runs through the coil, it needs to be an air-core coil. I think a good rule of thumb is to limit iron-core coils to woofer circuits used below 300Hz, maybe 500Hz tops. Above that, the inductance required is small enough that an air-core coil is not all that large anyway. Helps reduce hysteresis and saturation, and the resulting intermodulation distortion that is caused by it.
mantha3 Messages: 72 Registered: May 2012 Location: Lino Lakes, MN
Viscount
Right on. I'll keep that in mind.
Bill, On each of your crossovers you have 2 large black capacitors. One real tall standing up on your crossover and then another about half the height. What is the scoop on what you are using? If I may ask.
GarlandB Messages: 27 Registered: July 2009 Location: Natick, Massachusetts
Chancellor
Hi Mantha3,
I'll jump in here for Bill. The Caps you see are Obbligato film and oil caps. They are very good for their price and are affordable for the highish values you need for crossovers. I used to use motor run caps from GE but now also use the Obbligatos in my 4 Pis. Really good stuff. I also use them as parafeed caps in my tube amps/preamps.
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