Zilch's AK Design Collaborative - Econowave Speaker
- Thread starter Zilch
- Start date
You input the exterior dimensions, which would yield 7.5 ft3.
Russellc
Addicted Member
similost
Rockin and Rollin....
If you use the wood grill on the front, you will have to recess the front baffle to set the waveguide face flush to the baffle..
Also, this is part of the reason I put the woofer on the rear of the baffle. No room with the wood grill. The other reason is, if you use a 15" woofer, and the larger jbl waveguide the two will have to overlap, and one on front and the other on the rear is the only way they will fit, unless you use a JBL woofer with the 4 flat sides.
rage
Well-Known Member
Zilch,
At one point you did a minimal crossover for the B&C DE250 and QSC waveguide. I really can't recall what woofer.
In that crossover you had a capacitor (5uf from memory) and maybe an L-pad. I don't believe you where using any compensation. I don't think you had an inductor between the + and - as well.
What does adding the inductor do to the HF section? Is it to protect the compression driver or is there some measurable difference in the frequency response? I am contemplating adding that inductor in my "minimal crossover" that I am using with the BMS 4552.
At one point you did a minimal crossover for the B&C DE250 and QSC waveguide. I really can't recall what woofer.
In that crossover you had a capacitor (5uf from memory) and maybe an L-pad. I don't believe you where using any compensation. I don't think you had an inductor between the + and - as well.
What does adding the inductor do to the HF section? Is it to protect the compression driver or is there some measurable difference in the frequency response? I am contemplating adding that inductor in my "minimal crossover" that I am using with the BMS 4552.
The inductor makes it a 2nd order filter. By shunting the frequencies below which its impedance (inductance) becomes significant, they pass through the inductor to ground rather than through the driver. In the standard Ewave configuration this is necessary to ensure good phase matching, and also gives a steeper filter slope and protects the driver from overexcursion.
For the standard Ewave you should definitely include this coil, particularly since you have rough response below about 1500Hz due to the loss of pattern control.
My current XO is 5uF, used with impedance compensation on a JBL 2426h. I haven't changed it, with the exception of adding an extra damping resistor (in parallel with the driver) since changing my Baddy-waves to the Bumma shown here (this is only 2 days ago). Woofer in both cases is JBL 2226h, the foam collar is there to damp the horn cutoff resonances (below pattern control region) and is to my opinion necessary if you're going to use a simple cap-based XO. The yellow foam in the throats is reticulated aquarium foam, used for suppression of "HOM" (sound bouncing around within the device), which are a marginally debated issue. I like the sound better with the foam so that's good enough for me.
Baddy-waves
Bumma
Ultimately, I did add the inductor, for additional protection of the driver, not for its contribution to the filter transfer function within the bandpass, largely out of concern that some builders might well use these designs in high SPL applications. It's a consideration that Wayne Parham brings to the table here, and I respect his experience in such matters. The HT enthusiasts also talk a lot about high SPL in their applications; I try to be sure that, real or not, EconoWave meets those specs.... :yes:
Update on my Advent 5002 project.I have finished one and waiting for the weekend to get here to get on the other one.First impression on the one thats done it sounds great deep bass and very detailed highs very nice.:yes:Heres a couple of pictures.Need more refoam practice but they sound good, going to have to put some velcro in the holes for the grill they will stand out a little but it will keep danger away.
Attachments
Sansui G8000 is cranking the tunes as I type great speaker walnut veneer here we come!!!
Hey Zilch do these go on the project list.
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You're a lucky guy if you get a pair of 123A-1 for $85 in good shape. They're perfect for Ewaving and have some of the cleanest high frequency behavior around in larger woofers.
You can get a good 1st order on-axis app. 2k slope with the 123A-1 by using a felt pad in front of the driver, on a driver grille. 4x6" 1/4" thick wool F11 felt works nicely, on the higher end Parts express woofer grilles.
Indeed.
If you look at the parameters, they are suitably used in smaller closed-box alignments. Model them as such to see.
Gordon designed multiples of them into some bandpass subs several years ago, as well.... :yes:
HA!
Zilch holds the world record for seven in the last 5 months alone:
http://techtalk.parts-express.com/showthread.php?t=215536
No one has yet verified, but it appears to be a "Yes."
voltcontrol
Fizheuer Zieheuer
The PH612 is cheaper, strange move from PE to brand it as for themselves and sell it at a slightly higher price, no?
Ps if you search PE for 1" horns, set price low to high they even show up next to each other.
Ps if you search PE for 1" horns, set price low to high they even show up next to each other.
bwaslo
Active Member
There's a set of each here (the PH from MCM and the H from Parts Express), they are virtual clones, look to be off the same mold. The MCM looks a (very) little shiny-er on the outside and has a bit larger set of chips out in the throat where it looks like it was broken from the mold, but probably just unit-unit variations. Both measured the same response, within a half dB or so, when connected to the Selenium 220Di.