My Econowave Semi-Deluxe Build - AVS Forum
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post #1 of 40 Old 10-06-2010, 05:53 PM - Thread Starter
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I've been eager to build a set of the Econowave speakers ever since I heard about them recently. So I ordered the QSC HPR 152i waveguides, B&C DE250 CD's, and the appropriate Deluxe crossover components. I started with a pair of perfectly good Technics SB-CR77 floorstanders:


I always thought these speakers had awesome bass but the highs were only "blah" - which makes them a great contender for swapping in the HF section of an Econowave! If the two halves don't mesh well, I will get a pair of the recommended 3012's and build new cabs (so this kind of sets the stage for my expectations of this build... )

First up was to tear the donors apart:


And the guts (almost mildly impressive ):


Here is the proposed cutout for the WG (12.5x8.5" opening):


Took the plunge! (Not really, I only used a jigsaw freehand):


First dry fit (holy crap this might actually work! ):


Since I cut out such a large portion of the baffle, it was kinda flimsy looking so I cut a brace out of scrap 3/4" MDF:


Now I'm sure you noticed that the cutout for the WG and the old port location were intersecting. It needed to be plugged. Here is the start, putting on the backer piece:


Then I used my sweet Jasper circle jig and router to make a plug for the hole:


Now that the physical modifications of the cab are finished, and I never cared for the finish of these speakers, I rolled them with a coat of Kilz primer (notice new port location, too):


Let that dry overnight, then do another test fit (spry eyes will notice that I spray painted the woofer trim ring flat black ):


Looks pretty badass in my opinion!

Rolled on the first coat of flat black paint with a foamy sponge roller (still wet):


And that brings you up to date! The paint can said I have to wait 4 hrs before applying an additional coat, so I've got 3 more to go. I'll update this thread again with more pics as I finish this project.

There are still quite a few tasks left for these:
1) Second coat of paint
2) Pre-drill WG mounting holes
3) Remount the port
4) Assemble crossovers (Zilch is sending me some of his cool PCBs)
5) Wire up components
6) Drill a hole and mount the L-pads
7) Put a little stuffing in the box
8) Final assembly!
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post #2 of 40 Old 10-06-2010, 06:22 PM
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Looking good. I am looking forward to hearing about how they sound.
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post #3 of 40 Old 10-06-2010, 06:47 PM
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EconoWave Deluxe summary:

http://techtalk.parts-express.com/sh...79#post1626379

Just want to be sure everyone's aware that there are specific instructions for loading the Deluxe custom crossover circuit on standard EconoWave PC Boards:

http://www.audiokarma.org/forums/sho...16#post3529116

Nobody but me has doubled the resistors for increased power dissipation, so it's probably not necessary unless you're going to use them for sound reinforcement....

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post #4 of 40 Old 10-06-2010, 08:31 PM - Thread Starter
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Quote:
Originally Posted by dykz34 View Post

There are still quite a few tasks left for these:
1) Second coat of paint
2) Pre-drill WG mounting holes
3) Remount the port
4) Assemble crossovers (Zilch is sending me some of his cool PCBs)
5) Wire up components
6) Drill a hole and mount the L-pads
7) Put a little stuffing in the box
8) Final assembly!

2nd coat of paint is done. Coverage looks really good but I'll check in the morning if a 3rd coat is needed (it only takes about 10 minutes to do both cabs).
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post #5 of 40 Old 10-06-2010, 09:40 PM
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if it was me i would have just kept the finish that was already on the speakers... cuz wow that rolled on black looks like your speakers are made out of tar
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post #6 of 40 Old 10-07-2010, 12:16 AM
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Textured flat back is de rigueur for HT....

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....Crank up the SIGNAL ... cut back the noise....
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post #7 of 40 Old 10-07-2010, 06:40 AM
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I love it!!! Well done with the box modification.

What is the response of your woofer, It looks really nice cleaned up!

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post #8 of 40 Old 10-07-2010, 06:58 AM - Thread Starter
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Quote:
Originally Posted by ZilchLab View Post

Textured flat back is de rigueur for HT....

Yup, these are going in the HT - can't see em in the dark!

Quote:
Originally Posted by penngray View Post

I love it!!! Well done with the box modification.

What is the response of your woofer, It looks really nice cleaned up!

Thanks! I haven't measured the response of the woofer, and to be honest I don't know if I will. My ears will be the judge - but if I get frisky, I could fire up the cal'd ECM8000 test rig... hmmm...
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post #9 of 40 Old 10-07-2010, 09:11 AM
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I really like the looks of this. Actually, I think they would have looked really good in white after seeing them primed. Now I am sitting here staring at my collection of very large vintage speakers trying to decide which one needs a big hole cut into it. But on the other hand my wallet is trying to talk me out of it. ahh decisions, decisions.
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post #10 of 40 Old 10-07-2010, 11:38 PM - Thread Starter
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Here's a pic of the finished paint + components (I was secretly hoping to not have to fill the gap around the old port hole, but it looks like that will need some attention yet):

I really like the flat black look.

The original setup of these speakers did not use any gasket on any of the speakers when mounting to the box, so I added some foam gasket tape to the perimeters of the woofers:


I wasn't too impressed with the foam gaskets on the QSC waveguides (they appeared to be open cell and they had 3-4 splices on each WG) so I replaced the gasket material there, too:


I read somewhere on here that the waveguides have a possiblility of resonating and that it's recommended to add some mass to them, so I stuck some butyl mat from my car audio days to them (only one is pictured, but I did both):


I'm hoping that I receive the PCBs tomorrow so I can build the crossovers and start figuring out final locations within the cab.

Thanks for following!
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post #11 of 40 Old 10-08-2010, 11:28 AM
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i was just going to ask whether you damped the horns. you beat me to it! yours is a badass build.

the flat black looks cool too. what's the dealio with the hole in the side of the box. are you planning to add a port or something?

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post #12 of 40 Old 10-08-2010, 11:35 AM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

i was just going to ask whether you damped the horns. you beat me to it! yours is a badass build.

the flat black looks cool too. what's the dealio with the hole in the side of the box. are you planning to add a port or something?

Thanks! I'll be putting the factory port in the hole on the side.
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post #13 of 40 Old 10-08-2010, 11:36 AM
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they are looking so good, i'd take the extra time to clean up the previous port hole. some "high build primer" might be something that you want to look into.

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post #14 of 40 Old 10-08-2010, 11:40 AM
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oh crap, i didn't see any fiberglass on the back wall of the enclosure. this means you are going to get rear wave bounce back from the back of the cab through the driver. definitely get 1.5-2.0" of fiberglass on the back wall at a minimum. this will really help clean up the midrange.

edit: i see stuffing is on your list. once again, you are ahead of me.

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post #15 of 40 Old 10-08-2010, 11:44 AM - Thread Starter
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Quote:
Originally Posted by LTD02 View Post

they are looking so good, i'd take the extra time to clean up the previous port hole. some "high build primer" might be something that you want to look into.

Yeah, they are turning out better than expected - I'll take some time to fill the gap this weekend. I'll probably just use wood filler, sand, then repaint.

Quote:
Originally Posted by LTD02 View Post

oh crap, i didn't see any fiberglass on the back wall of the enclosure. this means you are going to get rear wave bounce back from the back of the cab through the driver. definitely get 1.5-2.0" of fiberglass on the back wall at a minimum. this will really help clean up the midrange.

edit: i see stuffing is on your list. once again, you are ahead of me.

I had planned on loosely filling the whole cab with the cheap Walmart pillow stuffing - good idea or bad? Or should I specifically use FG?
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post #16 of 40 Old 10-08-2010, 12:00 PM
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"I had planned on loosely filling the whole cab with the cheap Walmart pillow stuffing - good idea or bad? Or should I specifically use FG?"

to the best of my knowledge, this one has not been resolved.

since the chance of it blowing out the port and into the room as may be the case with a high excursion subwoofer is low, i'd stick with tried and true and go with the fiberglass. i haven't researched it sufficiently to be able to point you to several a-b comparo's of fiberglass vs. other stuffing materials.



"The red curve was the first test, where the inside of the large enclosure was empty (except for the old loudspeaker), and the top was 3/4" MDF. The blue curve represents the same configuration except that the interior was filled about 50% with fiberglass (the garden-variety type used to insulate houses). The fiberglass filling reduces the panel vibration by about 20 dB across the entire frequency range. This corresponds to absorbing 99% of the sound energy, at a very low cost, and with very little effort. And it kills internal standing waves. The lesson here is real clear: stuff the enclosure with fiberglass."
http://www.silcom.com/~aludwig/Louds...struction.html

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post #17 of 40 Old 10-08-2010, 12:05 PM
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"I'll take some time to fill the gap this weekend. I'll probably just use wood filler, sand, then repaint."

that is why i mentioned the high build primer. with wood filler, you can often get little pinholes that are a pain in the arse to try to close up. that is what high build primer does.

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post #18 of 40 Old 10-13-2010, 10:28 AM - Thread Starter
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Quote:
Originally Posted by dykz34 View Post

There are still quite a few tasks left for these:
1) Second coat of paint
2) Pre-drill WG mounting holes
3) Remount the port
4) Assemble crossovers (Zilch is sending me some of his cool PCBs)
5) Wire up components
6) Drill a hole and mount the L-pads
7) Put a little stuffing in the box
8) Build speaker stands
9) Final assembly!

Sorry guys, not much new progress on these. Zilch kindly offered to reship my PCBs since the others never showed up. Once I get those, I'll assemble and finish those. In the mean time, I plan to attach some fiberglass to the walls of the enclosure with 3m Super77 spray. I'll also do some calculations on seating height and build some stands to lift the CD to ear level.
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post #19 of 40 Old 10-15-2010, 05:00 PM - Thread Starter
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Got the Ewave boards today! However, I realized that PE sent me the wrong components for them. I've contacted Customer Service @ PE.
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post #20 of 40 Old 10-15-2010, 05:11 PM
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If I had been thinking, I'd have suggested that you wire-nut up a prototype crossover while waiting for the boards to arrive; that way we'd have discovered earlier whether the parts were correct....

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post #21 of 40 Old 10-16-2010, 10:07 AM - Thread Starter
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Got an email from PE already, my replacement order will ship on Monday! They said to keep the incorrect items which is kinda surprising. I'm about 2 days transit from Ohio so hopefully I'll have the parts Wednesday.

On another note, I did pick up the FG to go in the cabs so I'll get that glued in this weekend. And, since I have 3 of x-over components I'll assemble those to get a jump start. Hopefully I can finish them soon!
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post #22 of 40 Old 10-20-2010, 08:23 PM - Thread Starter
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Made good progress tonight.

1) Mounted the ports
2) Lined the enclosure with 2" of fiberglass
3) Assembled the crossovers
4) Mounted the L-pads
5) Rolled on the final coat of paint

Here are a couple pics (pre-paint):



Tomorrow will be to mount the crossovers to the braces and then final assembly!
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post #23 of 40 Old 10-20-2010, 08:33 PM
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These better work....

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post #24 of 40 Old 10-20-2010, 09:53 PM - Thread Starter
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Quote:
Originally Posted by ZilchLab View Post

These better work....

I'm sure everything will be just fine...
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post #25 of 40 Old 10-21-2010, 07:37 PM - Thread Starter
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Quote:
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I'm sure everything will be just fine...

Ok, after a minor hiccup (I forgot to install J1 and J2 on the crossovers) they are finished! No pics, sorry! I watched a movie with them and am really impressed. The details are amazing with these. Now I feel like the rest of my system is lacking.
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post #26 of 40 Old 10-21-2010, 08:25 PM
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awe, come on, a final pic is a requirement. ;-)

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post #27 of 40 Old 10-22-2010, 06:24 AM - Thread Starter
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Quote:
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awe, come on, a final pic is a requirement. ;-)

Yes, of course. I wanted to listen to them last night so taking a picture became a lower priority. I will get one this weekend.
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post #28 of 40 Old 10-26-2010, 08:58 PM
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Quote:
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i will get one this weekend.

Well...??

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post #29 of 40 Old 10-27-2010, 01:02 PM
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It looks very good for a DIY speakers. I am planning to made a similar project but with Sony speakers. The tutorial is very good for my purpose. Could you tell me what adhesive you use it for sticking the pieces together ?
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post #30 of 40 Old 10-27-2010, 01:03 PM - Thread Starter
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Quote:
Originally Posted by ZilchLab View Post

Well...??

Tonight.

Quote:
Originally Posted by Alanis View Post

It looks very good for a DIY speakers. I am planning to made a similar project but with Sony speakers. The tutorial is very good for my purpose. Could you tell me what adhesive you use it for sticking the pieces together ?

Sticking which pieces together?
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