Yes, that was it. It made a subtle but noticeable change.
'Do it' - you mean cut them up and front mount the horn? As for the 30Hz tuning, that's how I have them now - 2 tubes sitting in each port.
Zilch's AK Design Collaborative - Econowave Speaker
- Thread starter Zilch
- Start date
Yes, that was it. It made a subtle but noticeable change.
'Do it' - you mean cut them up and front mount the horn? As for the 30Hz tuning, that's how I have them now - 2 tubes sitting in each port.
You mean the "waveguide?"
Yes. Several E'Wavers have demonstrated how to fill in any of the cutouts that you might have to.
There may be a few spares around here somewhere....I think a PC board will be used next time.
jimreeves
Poopy & Me
You can do it quick and easy like I did with my OLA's, .75" x 24" x 48" sheets of MDF are about $7 each at Home Depot. Cut your own new baffles and glue & screw right to your old baffles. Makes covering those pesky tweeter openings easy!:thmbsp:
Jim
Russellc
Addicted Member
Zilch, Does JBL make a version of our wave guide that is for bolt on 1" compression drivers, whether Econo or not? ( other than mega wave of course) Otherwise, what is the better CD horn to use, JBL or otherwise? Would one be better off using the not so Econo wave guide that is slightly larger format than 1" and use an adapter, or would this present the same problem? I would eventually like to use B&C 250.
Thanks,
Russellc
Thanks,
Russellc
I've wandered through a good chunk of this thread but could not seem to find anyone that used this one yet. If there is someone who has used it and have you compared it to any other inexpensive waveguides? Thoughts, measurements, anything?
I was going to order anyway, but thought I would ask. I've already got two different Dayton waveguides and plan on ordering up the MCM one as well.
chauncy
Active Member
Hi guy's, wanting to do an Ewave project with some L26 cab's I have and have never built a crossover before, ordered the parts from PE and layed the board out as best I could figure and glued it up @ work.....came home and was fishing around and stumbled on to a layout chart in this thread....mine is slightly different, can any one give me any reason this layout may not work....are the inductors to close to each other :scratch2:??....it's not wired yet so I can abort and reglue if I have to.....Thanks in advance....Chauncy....... also is the Pyle PH612 the same waveguide as the mentioned JBL waveguide....
Attachments
The only bolt-ons are the 1.5" throat series of the same waveguides, which would require a bolt-on to bolt-on throat adapter, which are available.
I wouldn't make a huge deal of this; "In detail" is operative here. Use the Selenium thread-on adapter and the standard waveguide.
Both Jackgiff and Skywave-rider have built with them successfully, using the standard E'Wave crossover. The JBL beamwidth specs are spectacularly good. I've got to mount them on cabinet baffles yet to verify, but they are "official" E'Waveguides.
It'll work fine; you have the inductors at right angles to minimize crosstalk.
Once complete, you can test for this by substituting a dummy resistor (8-Ohms, preferred) for the woofer, and with no input to the highpass, listen to the waveguide.
You can use an "improved" layout on the next pair of E'Waves you build. Seems hardly anybody can stop with just the first ones.
The best we have been able to determine, yes. The main difference is that it has a metal threaded insert in the throat....
Russellc
Addicted Member
thanks for your reply Mr. Z.....Sorry, Not sure I understand your above statement
Well, the question concerns cross talk. This is when the coils are in such close proximity to each other, and not oriented 90 degrees apart, the coils can communicate with each other, a bad thing. The bass signal is being picked up by the coil in the hiogh frequency section and "playing" it through the HF driver.
To test, disconnect the signal from the input on the HF circuit. The horn should be silent. If cross talk is happening, you will hear something through the HF horn. Since no signal is connected to it, the sound is being picked up by the HF coil, FROM the LF sections coil.
Hope that helped,
russellc
Russellc
Addicted Member
And nice job on the crossovers! And keep going, you are almost addicted, keep going.....you are almost there....:thmbsp:
Russellc
more impressions on the sound...
I was able to listen a bit more last night, and had the wife listen as well. She likes how they sound, but noticed that one was louder vs. the other. Trim the Lpad and that's fixed. 'They seem a bit bright' - so I rotated the speakers out so that instead of toeing in and pointing at me, they are flat to the wall. Wow!! What a huge difference that made! They sound much better that way, and the imaging has really improved. Instead of sounding like 2 speakers, with everything either on the left, the right, or in the middle, it's now spread out between the speakers. All this in a tiny room has typically been too much to ask for from every other speaker I've set up in the workshop. In fact, I've never expected 'imaging' of any sort because of the size of that room. I think I can sell the Small Advents, or at least try to convert them into EWaves! Of course I also now want to build a 2nd set that I can put upstairs into the bookshelves where I currently have Celestion Ditton 22s :thmbsp:
I was able to listen a bit more last night, and had the wife listen as well. She likes how they sound, but noticed that one was louder vs. the other. Trim the Lpad and that's fixed. 'They seem a bit bright' - so I rotated the speakers out so that instead of toeing in and pointing at me, they are flat to the wall. Wow!! What a huge difference that made! They sound much better that way, and the imaging has really improved. Instead of sounding like 2 speakers, with everything either on the left, the right, or in the middle, it's now spread out between the speakers. All this in a tiny room has typically been too much to ask for from every other speaker I've set up in the workshop. In fact, I've never expected 'imaging' of any sort because of the size of that room. I think I can sell the Small Advents, or at least try to convert them into EWaves! Of course I also now want to build a 2nd set that I can put upstairs into the bookshelves where I currently have Celestion Ditton 22s :thmbsp:
chauncy, I used the Pyle waveguide and it sounds good. Can't comment on if it's exactly the same as the JBL part, but deep in this thread I'm pretty sure someone here had both of them and confirmed they were practically identical. Your crossover layout looks good. It is preferred to have the inductors farther apart as they can interact and change each others inductance value. See here:
http://www.troelsgravesen.dk/coils.htm
Heh, heh....
Looks like it can lay flat over there, also. :yes:
For others looking, my layout is here:
http://audiokarma.org/forums/attachment.php?attachmentid=133068&stc=1&d=1233530586
Jack turned that into what you see in my sig pic, with additional "features" such as biamp capability.... :thmbsp:
I've only done rudimentary dispersion measurements on the Dayton 7" x 7" waveguide. Generally, I prefer to use JBL PT waveguides, but the 8" square is too deep for KLH-17, and the 6" doesn't cover the existing cutout when mounted on center.
I have plenty of other options available to work with; I'd like to try the larger 18-Sound elliptical in something, for example, and recently had an opportunity to do that with bullnose Advents, but frankly, having "done" a half-dozen different combos successfully already, there's not a lot of satisfaction for me in playing the same tune over and over. I'd rather be working on more diverse projects and forging new paths for E'Wavers here.
The real challenge in KLH-17 was getting big bass to happen in that small box. In the end, it all worked out for whatever they ultimately became, and other AKers have built to that formula with results that pleased them. I can't ask for much better than that, even though they're not E'Waves, in my view....
I picked up two JBL 4648 that have (2) 2225H each. One of the drivers cones is smashed beyond recognition of being a cone and two more have slight rips. One driver is good to go... Boxes are nice. For yucks, I played one of the cabs with the two best drivers.. Man, these things have some dynamics...
In any case, I will start with reconing two of the drivers to 2235H.
Two part question for anyone:
Is there an AK member or advertiser that is a JBL repair agent?
Are 2235H recone kits still available?