Try different higher cap values once you get there, maybe.... :yes:
Zilch's AK Design Collaborative - Econowave Speaker
- Thread starter Zilch
- Start date
Russellc
Addicted Member
BB6P says you're tuned to ~27 Hz, which I have found to be too low. Shorten your ducts to 1.145" for 32 Hz, 1.631" for 30 Hz.
In all of the 2" cases, however, your vent velocities are quite high at volume, and they'll "chuff." As Duff suggests, move up to 3" diameter, 4.361" for 32 Hz, or 5.453" for 30 Hz, it says, which drop the vent velocities to less than half those with 2" ducts.
We tuned Duff's system using actual completed box tuning measurements at ZilchLab, and from these numbers, it seems we got it right. I've provided instructions for doing that in another thread here:
http://audiokarma.org/forums/showthread.php?t=144047
Consider side-to-side and top-to-bottom bracing. I'll put together a little demo here using Simpson Strong-Tie framing anchors. :yes:
Edit: Another option: add two more 2" ducts; all of them 4.219" long for 32 Hz (Black,) 5.19" for 30 Hz (Red). That'll give you some tuning options using ZilchPlugz™. If you tune to 32 Hz and plug one port, it drops to ~28 Hz, so you can compare the performance of both tunings.... :thmbsp:
More about these "Simpson Strong-Tie Framing anchors" as bracing please!
This sounds like the biggest development from Zilch labs since Zilch Plugs were discovered!:thmbsp::thmbsp::thmbsp:
Russellc
We like working with boxes having removable front baffles like Duff's Barzilays and JBL C36, for example. Whether made of plywood, particle board, or MDF, the relatively large side, rear, top and bottom panels are flexible and resonant. We can add stiffening battens to them, and reinforce the corners, but the best approach to making them rigid is cross-bracing.
We can't do that by fixedly installing braces as by glueing them in, for example; they must themselves be removable so as to allow the front baffles to be removed through the rear, and changed out at will. We can't just drill holes through the cabinet walls to accomplish this, but there are alternative solutions here:
http://www.strongtie.com/
Particularly:
http://www.strongtie.com/products/categories/angles-clips.html
My friends have heard my E-waves and now demand a pair for themselves...
I know this has been covered before but I can't seem to find any info. Is there a current production, reasonably priced (<$100) woofer that would work well in the E-wave?
These will be a combination of pa speaker for playing out and a speaker to use in the house when at home.
I know this has been covered before but I can't seem to find any info. Is there a current production, reasonably priced (<$100) woofer that would work well in the E-wave?
These will be a combination of pa speaker for playing out and a speaker to use in the house when at home.
Stuff happens when others hear E'Waves, don't it?
Several have been used successfully so far, Goldwood, Dayton, Eminence, others. Go to post #1 for the link to Member Projects; there's usually a bit of discussion regarding each one. You can get there easily by clicking "First" at the top or bottom of this (or any other) thread page. :thmbsp:
That sounds like dc270's project with Eminence, I believe it was. :yes:
Footnote: I'm looking forward to the day when a group gets together to build a bunch, one with a wood shop to build boxes, one with finishing skills, another with a wholesale account at PE for component purchasing, another who can load and solder crossover boards in their sleep, and finally, a get together (with pics for AK, of course,) where a dozen or so E'Waves get assembled all at once....
dnewma04
The Healer
Stuff happens when others hear E'Waves, don't it?
Several have been used successfully so far, Goldwood, Dayton, Eminence, others. Go to post #1 for the link to Member Projects; there's usually a bit of discussion regarding each one. You can get there easily by clicking "First" at the top or bottom of this (or any other) thread page. :thmbsp:
That sounds like dc270's project with Eminence, I believe it was. :yes:
Footnote: I'm looking forward to the day when a group gets together to build a bunch, one with a wood shop to build boxes, one with finishing skills, another with a wholesale account at PE for component purchasing, another who can load and solder crossover boards in their sleep, and finally, a get together (with pics for AK, of course,) where a dozen or so E'Waves get assembled all at once....
Don't forget "all with no spouses to get in the way"
Russellc
Addicted Member
Russellc
Addicted Member
Yer gonna hafta wait 'til I get a 2x4, a scrap of plywood, and some T-nuts together here....
Russellc
Addicted Member
Yer gonna hafta wait 'til I get a 2x4, a scrap of plywood, and some T-nuts together here....
Okey Dokey, I'll await the hardware to be gathered up.
Russellc
hhibrownsbac
Super Member
Just a little thing Id like to add on this bracing materials. I use simpson products everyday at work and you can get this stuff at any good lumber yard and dont have to get but a few pieces if that is what you need. Im sure that any lunber yard would have several dozen different styles you can select from. With a little inginuity, a screwdriver. small screws and a few scrap 2 x 4s you can brace it off to survive a bomb going off.
von.ah
Schultze!
This is DIY.
It's well if not perfectly centered.
[+/-....
Awesome. I'm going with the [+/-] mentality.
What's the consensus on tight/too tight with the waveguide? Some tension, a lot of tension, 8.65 lb.ft. [+/-] 0.77? I recall some mentioning of not altering the screen shape with tension...
Going to bed early tonight. :tresbon:
skywave-rider
Slumming in Akihabara
I just go for snug.
About centering..... that's what grilles are for.
:thmbsp:
About centering..... that's what grilles are for.
:thmbsp:
That was with the Pyle edition of the waveguide, which has a metal insert in the throat, whereas, the JBL one is just plastic.
Screw it on.
Done.
GMTA, obviously.... :yes:
lico
Super Member
My little friends got new legs
And after listening more, I think we have real keepers for the basement HT here.
OK - a little EQ needed to boost around 70 Hz to compensate for a room null is not a bad thing. The low end is there, these don't start rolling off sharply until under 30 Hz on the SPL. I might spend more time trying to tune them up, but I doubt it, will probably just listen and enjoy instead.
Played a lot of my music tonight, and can't find any shortcomings with the PT waveguide yet. Off axis response is great. No harshness on rock and roll. The imaging sitting directly in the sweet spot is maybe not quite as good as a small monitor gives me. But turn your head side to side slowly with these WGs and you can't tell which speaker the sound is coming in comparison. So is that what CD is all about? If so I like it....
And after listening more, I think we have real keepers for the basement HT here.
OK - a little EQ needed to boost around 70 Hz to compensate for a room null is not a bad thing. The low end is there, these don't start rolling off sharply until under 30 Hz on the SPL. I might spend more time trying to tune them up, but I doubt it, will probably just listen and enjoy instead.
Played a lot of my music tonight, and can't find any shortcomings with the PT waveguide yet. Off axis response is great. No harshness on rock and roll. The imaging sitting directly in the sweet spot is maybe not quite as good as a small monitor gives me. But turn your head side to side slowly with these WGs and you can't tell which speaker the sound is coming in comparison. So is that what CD is all about? If so I like it....
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http://audiokarma.org/forums/showthread.php?t=197859
Sure wish I had that theater in my basement.
[Or anywhere, for that matter.... :thmbsp: ]
Sure wish I had that theater in my basement.
[Or anywhere, for that matter.... :thmbsp: ]