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Zilch's AK Design Collaborative - Econowave Speaker

Question about crossovers

I've been reading some of the discussion on the development of the Ewave passive crossover. It's difficult because it's spread out across MANY pages.
IIRC, the woofer's crossover point is intentionally set 'low' and due to its response the acoustic crossover is 1600 hz, assuming certain acoustic and electrical characteristics of the woofer.

My question involves bi-amping a 2-way ewave.
Assume the following:

Voltage source amplification - high DF and essentially no interaction with driver impedance.
12 db/octave Linkwitz

How low can the crossover point be set with the 'classic' PH612/D220TI combo and still achieve acceptable performance from the driver/WG combo, leaving out the driver's power handling/frequency concerns?

Q2: Same question with 18db/octave slope.

Thanx
 
There are posts by both Jack and myself regarding active crossing using the "Standard" E'Wave HF compensation circuit. Advanced Search under our IDs and "CX3400" (the active we each used) will possibly bring them up.

The answer is, due to the resonant peak of the D220Ti in the crossover region, we were only able to have it work satisfactorily over a narrow range. You'll have to set up for measurements to do what you propose.... :yes:
 
Okay, that makes sense. The passive HP is designed to pull down the 2K bump and flatten the response down into the 1K6 crossover point.

I'm trying to optimize the crossover for a midwoofer, which with its extended response I expect to perform differently with the LP section than a woofer with low range response.

What I should probably do is run the active HP at 500 hz or so to reject out of band energy from getting to the HP amp and passive crossover, and let the HP passive components do their crossover and response shaping jobs as designed.
Then I can fool with the LP section to optimize it for the midrange that I'm working with. At the moment I have Vifa M13SG-09 in there and they show promise.

This will go slowly. I'm working nights now and having trouble sleeping in the daytime. Bad combination for doing any brain work.
 
what about the JBL thread on drivers?

Is the JBL 2416 as good as or better than the Selenium 220? I'm thinking I could put together an 'all JBL' setup with the LE14s in the L55 cabinets if I got a pair of these and used the PT wave guide. :scratch2: I've even seen these with some JBL horns (2371?) sell for around $100 for the pair. Comments?
 
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packrat said:
Is the JBL 2416 as good as or better than the Selenium 220? I'm thinking I could put together an 'all JBL' setup with the LE14s in the L55 cabinets if I got a pair of these and used the PT wave guide. :scratch2: I've even seen these with some JBL horns sell for under $100 for the pair. Comments?
Click to expand...
The response characteristics of JBL compression drivers are different from that of E'Wave's Selenium, and will very likely require different HF compensation. Wayne's Pi-Speaker crossover for JBL 2426H may be closer to what you need for 2416H, but you'll have to verify this yourself, preferably using actual response measurements, as Wayne does not use the E'Waveguide, either....
 
I'm not averse to doing a presentation, but I doubt they would allow my SawZall on the plane.... ;)
 
So does that mean you'll be coming at least?

Looks like my Waves will be in my room, and I think some Polk RTA's as well.
 
I hope they provide an improvement over where you are at..:) (Let us know)

They work nice with the HPM's, I'm sure if I had better speaker test gear there could
be a few changes, but for what I had used I believe there tweaked in pretty darn well.
 
Keg and I live within miles of The Fest and look forward to meeting out of town Ewavers.

Show of hands if you Ewave and plan to come to AK Fest
 
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Bauhausler said:
Show of hands if you Ewave and plan to come to AK Fest
Click to expand...

I'll be there on Saturday. I hope to get there in time for Larry Moore's seminar.

I just got my hands on a pair of JBL 2446 2" compression drivers. They will be rocking the workshop this weekend. If anyone has a SINGLE JBL 2380 horn, please contact me. Otherwise it's Bruce Edgar 500hz for 800 up, and tractrix for 200-800, with 200 down to be supplied by ... probably 2226 in homebrew cabs.

But I'm still an e-waver in other systems!
 
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hummmm 2226 in a JBL 4530 scoop :scratch2::scratch2::banana:

You are welcome to come over to my place and hear my scoops T. Cheers.
 
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I'll be there and Kegger MAY be using my LE14 EWaves.

I'd like to have them there, but don't know if I feel like lugging them upstairs and out there. They're smaller than the La Scalas, but sure as heck aren't Minimus 7s :D
 
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I plan on bringing my new power supply (power strip) and my octal phono pre to the SMAC room. But I sure ain't goin a bring my JBL scoops.
 
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