• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Zilch's AK Design Collaborative - Econowave Speaker

Russellc said:
If you have 4-5 cu ft. I can STRONGLY recommend the JBL 2235H.

Russellc
Click to expand...
I think his 861 cabinets are internally the same as my 872x Madrids, little less than 3.5 cf, not deducting any volume for the space occupied by the drivers. A back mounted 15" will just fit with an overlapped, front mounted, standard Pyle/JBL wg.
 
Last edited:
That Altec 861 cabinet looks to be around 3.3 -3.4 cu. ft. Perfect size for a number of 12 inch woofers. Can you replace the front baffle to make a 12 inch fit along with the waveguide?

If you want to use a 15 inch, you may have to sacrifice low bass.
 
Yes I can replace the front baffle or use a adapter ring for 12",thanks

Now the question is which 12 " woofer, Vintage or Eminence Beta LT12, Selenium, AE Lambda,etc?

Russell, I think Madrid enclousure is very similar to the 861 (870B system), Santana, Seville,
 
Dr. Beaker said:
That Altec 861 cabinet looks to be around 3.3 -3.4 cu. ft. Perfect size for a number of 12 inch woofers. Can you replace the front baffle to make a 12 inch fit along with the waveguide?

If you want to use a 15 inch, you may have to sacrifice low bass.
Click to expand...
3.46 cf gross internal volume is the number I have been using. A lot of Altec cabinets differ in external appearance - different tops, trim, etc - but are identical internally, particularly when they used the same LF driver. They tended not to reinvent the wheel for the sake of a styling variation. Madrids also used the 420x LF driver. The front baffle on my 872B Madrids is about 18-5/8" wide x 22-1/2" tall and is removable from the front.

MartinV56 said:
Yes I can replace the front baffle...I think Madrid enclousure is very similar to the 861 (870B system), Santana, Seville,
Click to expand...
You are correct - Santana front baffle is the same width, a little taller but overlaps the bottom edge of the cabinet by a couple of inches, hence the box volume is virtually the same. I have e-waved the Madrids, keeping the Altec 420A woofers and the Santanas where I swapped for LE-14A's. The 420A's are BIG TIME more efficient than the LE14A's.
 
Last edited:
Just dropping in to say "I'm still here, still wavin'"

4627, AKA E145-8 / 2410

2410 disabled, of course.
 

Attachments

  • JBL 005.jpg
    JBL 005.jpg
    88.1 KB · Views: 124
  • JBL 002.jpg
    JBL 002.jpg
    53.1 KB · Views: 76
Clmrt said:
Just dropping in to say "I'm still here, still wavin'".
Click to expand...

HEY, welcome back, E'Waver, and thanks for the update!

:scratch2: Got a pair of E145-8 need recone here, and some empty 4691B cabs. I'm bettin' that combo works mighty nicely.... :thmbsp:

jimreeves said:
Nice! Way to represent!
Click to expand...
I believe we effectively demonstrated that roadkill can still rock.... :D
 
Last edited:
Has anyone ever talked to PE about setting up all of the Ewave components in a kit such as they have done with several other speaker designs? They could offer only the crossover components, crossover board, and Selenium 220Ti driver in a reduced priced package. Sounds like a pretty sound package that would sell extremely well.
 
Clmrt said:
Just dropping in to say "I'm still here, still wavin'"

4627, AKA E145-8 / 2410

2410 disabled, of course.
Click to expand...

Is that an AudioSource AMP-100 that I see? Are you using that to power your JBL's? I was thinking about getting one of them to power my surround speakers. Just wondering how it sounds.

Denny
 
A few questions for you gentlemen:

Could wiring the l-pad in front of the compensation bypass the compensation if done wrong?

What reasons would I see a sharp drop off after 16k, aside from the above issue? I've found this dropoff after a friend used the RTA on his Iphone. Using a standard mic, tone generator and the mic input on my sound card shows the same thing, even after changing the lpad wiring. I'm not certain the sound card would have response above 16k anyhow. I'm also not certain how good my hearing is up that high!

Anyone want to guess a db value for building a fixed l pad? I'm thinking buying resistors to get me anywhere from 10-15db of attenuation.

I'm running the Dayton Classic 10" woofers, 8 ohm - DC250-8.

Prior to rewiring the lpad I used it about half way turned up. After rewiring last evening to the schematic and using the pad after the compensation I get very little adjustment beyond first turning them on, and they spike very quickly.

I suspect I have bad lpads, I reused the originals from my L26 cabs. I really don't care for the adjustment and potential to not have them balanced, so I'd like to eliminate the l-pad from the final equation.

I see now my need to invest in an RTA mic and mic processor, or a Berringer deq 2496. I'm betting that's the normal progression!

Thanks all!
 
Hi Folks!

I posted a query in the speaker forum and was directed here.

I've got a pair of Marantz 4mkII cabinets that I'd like to Econo-Waveize. I was hoping to get some suggestions for a low- and high-frequency driver combo. I see the Selenium driver is suggested, and wondered about what low-frequency driver would work well given my cabinet (486mm x 286mm x 210mm = 1.03068 cu feet)

Would this woofer work with my cabinet? I am unclear as to how closely the woofer guidelines on the part-express woofer selection guide should be followed. Is there any leeway or rules of thumb for matching suggested volume to actual volume?

It was suggested I match this driver with this waveguide. Any others I should consdier? I'd like to spend $50 or less on each driver if possible.

Thanks everyone!
 
Rene, that Dayton 295-310 woofer in a 1 cubic foot enclosure, with a vent tuned to around 26-28 Hz (depending on taste), will work great. I've done that combo before. Very satisfying bass response into the mid-30s-Hz range. Should work quite well with any of the E-wave flare/driver combos.

Regards,
Gordon.
 
Is this my day?

I am somewhat disappointed, in that I really was looking forward to attempting to adjust the time delay of the woofer to set the vertical nulls at about equally above and below the midpoint of the speaker baffle midpoint. It was entirely too easy.

While trying to adjust the proper crossover frequency points, placement of the microphone was overly critical. Both high and low outputs of the Linkwitz-Riley are supposed to be in phase. That is how I thought I wired the speaker and crossover. Surely the nulls would be far enough away to allow testing pretty much dead center. WRONG! I finally decided that it was time to measure the vertical nulls. A switch was added to easily reverse the phase of the HF. Low and behold, with normal wiring one of them was directly in front of the baffle center. I even removed the waveguide and checked the connections of both drivers.

The first picture shows the measurement microphone directly over the center of the baffle, when wired according to the normal arrangement for the L-R Xover, and the FR on the RTA can be seen showing the dip at 1.6 KHz. The second picture is showing the wiring reversed for the HF, and the FR shows no dip at 1.6 KHz. The third picture is of the FR with normal wiring, and the resulting dip at 1.6 KHz, the crossover frequency.

The next two pictures show the microphone location for lower and upper vertical nulls. As near as I can calculate them, the upper is about 30 degrees above the center of the baffle, and the lower is about 25 degrees below. Well within any limits I would have been shooting for. And the cabinet is reclined roughly 15 degrees, which would place the nulls at about -10 degrees to +50 degrees. Seems ideal to me. The apparent null at about 160 Hz is obviously the ceiling in my garage. All that was required to get the nulls set was to reverse the HF connections.

The last picture is the FR of the speaker so far. The Low pass is set for 1.6 KHz, and the High pass is set for 2.8 KHz. It looks like about 3 dB variation from crossover till the DE250 falls off at about 16 KHz. +/- 1.5 dB is quite good, but some more tweeking will be done when I get the other crossover finished, and compare them.
 

Attachments

  • PhaseNormal.jpg
    PhaseNormal.jpg
    118.2 KB · Views: 69
  • PhasReversed.jpg
    PhasReversed.jpg
    118 KB · Views: 50
  • PhaseNormFR.jpg
    PhaseNormFR.jpg
    51.1 KB · Views: 35
  • NullLower.jpg
    NullLower.jpg
    117.1 KB · Views: 57
  • NullUpper.jpg
    NullUpper.jpg
    113.1 KB · Views: 67
  • FRforLR4Xover1.jpg
    FRforLR4Xover1.jpg
    53.1 KB · Views: 42
Last edited:
Half wavelength @ 1.6 kHz is 4.24" = 0.625 ms?

Can that be the offset of the drivers' acoustic centers when they are flush mounted?

[Seems like maybe so.... :thmbsp: ]
 
Last edited:
Thank you so much Zilch and Gordon! I will study up on the info linked to. Gordon, what does a 'vent tuned to around 26-28 Hz' mean? -- just a guess here, but does this mean that the frequency a vent is tuned to is a function of that vent's opening size and vent length?
 
You must log in or register to reply here.
Back
Top Bottom