Here is the simulated (red) and measured (black) curve at 1.40m on axis. It looks OK 30 degrees off-axis too.
The reduction of C1031 from 2.2uF to 1.8uF brings the 6-10 kHz level 1-2 dB down.
Use the network as a guideline if you want to. I think the system sound good (and packs tremendous punch) - but I wouldn't be suprised at all (in fact, I almost expect it) if Earl's waveguies will sound better.
The reduction of C1031 from 2.2uF to 1.8uF brings the 6-10 kHz level 1-2 dB down.
Use the network as a guideline if you want to. I think the system sound good (and packs tremendous punch) - but I wouldn't be suprised at all (in fact, I almost expect it) if Earl's waveguies will sound better.
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I have been playing around with a project based on the "econowaveguide" thread at AK. Basically, the thread takes the JBL #338800-001 wave guide @ 9.90 each, the Selenium 220ti compression driver, 42 bux at parts express, and a cross over, ( all for a grand total of 170 us or so for two channels) and matches that to whatever woofer, most using jbl.
In my own case, I chose JBL 4647 bass box for the bottom, loaded with 2225H drivers. This system cheap as it is, kicks major a-r-s-e, it almost silly how well these particular parts work together. Look at the thread. I am going to rework the crossover as soon as I get some info from the thread author, to use JBL 2425H. I have tried the wave guide with 2425H on top of my Altec A7s, replacing the 511B and 802 8G. I was amazed at their ability to keep up.
Russellc
In my own case, I chose JBL 4647 bass box for the bottom, loaded with 2225H drivers. This system cheap as it is, kicks major a-r-s-e, it almost silly how well these particular parts work together. Look at the thread. I am going to rework the crossover as soon as I get some info from the thread author, to use JBL 2425H. I have tried the wave guide with 2425H on top of my Altec A7s, replacing the 511B and 802 8G. I was amazed at their ability to keep up.
Russellc
gedlee said:
They can and do! I and a bunch of other guys have ordered them and have them in operation. 9.90 a piece...delivered to my door from JBL in about a week or less, for under 30 bucks total. When I get home, I'll post a pick or two, or you can see them at the aformentioned thread.
Russellc
Bt the by, not ALL of their wave guides are this cheap, just the model specified. That 10 buck waveguide, a 42 buck Selenium driver, and the specified crossover has a response as flat as Nebraska, and no kidding, sounds astonishingly good. cheap enough to try out, that's for sure, and I dont think anyone will be disappointed.
Russellc
Russellc
gedlee said:
plus or minus 2 to 2.5 db over the horns range, take a look at the thread, rta results and all. I know it sounds impossible, I'm 52 years old and have dabbled in this stuff for decades, never seen anything like it. Sounds so good it'll make ya giggle.
Cheap enough to prove out, 170.00 and your there! ( both sides) And believe it or not, flat as a pancake. Quite flat for any speaker, ridiculously flat for horns. Try it, you'll like it.
Their doing the same thing with the same waveguide and the BMS 4550, 4552 nd, and putting them on top of altecs, etc., but try it with the little Selenium driver.
Trust me on this, they are FLAT, surprisingly flat. Please make a liar out of me, my wife is about to commit me to a home for the befuddled. This wave guide is well documented by several on AK as well as LHF ( Lansing Heritage Forums, www.audioheritage.com).
Have doubts?
Check it out!
Russellc
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