AVForums South Africa

DIY & Tutorials => DIY for audio => Topic started by: SeanS on March 04, 2018, 06:51:05 PM

Title: Speaker for fun :)
Post by: SeanS on March 04, 2018, 06:51:05 PM
So I started last year slowly putting boxes together to use up drivers in cupboards.  The aim is to do something not too big that does a solid 40hz. I suspect these will be approx F3 @ 38hz. Size 101 x 25 x 36cm, so + on WAF. Cab angles back 5 degrees. Front slot port, I want them to be close to wall friendly.

Drivers will be Scans...  2x18W, 15M, and 6600 or 6620

I have them progressing nicely, managed to get some time in this weekend to slice off the edges. A mission with only a router.. but less time that driving them somewhere, explaining, driving to collect..

Cabs are birch ply, nice and solid vs. MDF, 36mm for bass drivers, 18 for mid/tweeter (don't want the mid in a tunnel). Cutouts are nicely rounded off at the back and I have some broomsticks across for bracing in the bass section to break up the large side panels.

Finish... I have 60 strips in 70 x 4 x 120 american walnut, sanded to 100 grit.. that wasn't cheap  :giggle:... but I think the finish will be worth it.

XO points... no fixed ideas yet, will measure and then think.

Hope to get the cabs finished in March / April to allow me to have a winter XO challenge

(https://i.imgur.com/nSfsUxp.jpg)
(https://i.imgur.com/KG6x3yQ.jpg)
Title: Re: Speaker for fun :)
Post by: pwatts on March 04, 2018, 07:26:07 PM
Finally! Looking very forward to how this turns out :)
Title: Re: Speaker for fun :)
Post by: SeanS on March 04, 2018, 07:30:22 PM
Finally! Looking very forward to how this turns out :)

yes.. I eventually made up my mind :).. decided against adding the SB 10", I would never settle on an XO with that, or may need to go active which is not the way I'm going.
Title: Re: Speaker for fun :)
Post by: Rhino on March 04, 2018, 07:41:00 PM
What a great build you are busy with.
Keep the pics coming.
Looks great.
Title: Re: Speaker for fun :)
Post by: pwatts on March 04, 2018, 07:46:18 PM
Well the SB10's can still be actively added adjacent with xover of choice if desired.. with the much lower xover frequency it should work fine. Woofer F3 should require xover in the sub-50Hz range I guess?
Title: Re: Speaker for fun :)
Post by: SeanS on March 05, 2018, 08:57:05 PM
Well the SB10's can still be actively added adjacent with xover of choice if desired.. with the much lower xover frequency it should work fine. Woofer F3 should require xover in the sub-50Hz range I guess?

I'd think a bit higher if I added I would make the 18w sealed... the sb10s would be the same.. so probably 80 to 100.. would have to be acfive.  However after hearing your subs I'd probably rather remain as is and if I was thinking of serious neighbouring  destroying bass would reconsider the plan. Your subs scared me 😂
Title: Re: Speaker for fun :)
Post by: pwatts on March 05, 2018, 10:43:20 PM
I'd think a bit higher if I added I would make the 18w sealed... the sb10s would be the same.. so probably 80 to 100.. would have to be acfive.  However after hearing your subs I'd probably rather remain as is and if I was thinking of serious neighbouring  destroying bass would reconsider the plan. Your subs scared me 😂

I think it was mostly room gain you experienced.. they performed much less terrifying in other locations ;)
Seeing the direction that my new speaker plans are heading they may perhaps end up for sale, or perhaps I'd play with some open-baffle sub ideas.
Title: Re: Speaker for fun :)
Post by: PhillipJ on March 06, 2018, 08:55:05 AM
Those look good! nice work  :2thumbs:
Title: Re: Speaker for fun :)
Post by: SeanS on March 08, 2018, 09:08:00 PM
The wood.. various grains, trying to decide what goes where..

(https://i.imgur.com/XLngFUJ.jpg)

(https://i.imgur.com/lDMo4jA.jpg)
Title: Re: Speaker for fun :)
Post by: Heinrich on March 09, 2018, 07:00:16 AM
that is PRETTY!!!

very keen to see it on the cabinet's
Title: Re: Speaker for fun :)
Post by: Gerlach on March 09, 2018, 07:13:27 AM
Sean, some really nice work you doing there. And that other set of yours are really nice to!!
Title: Re: Speaker for fun :)
Post by: Rhino on March 09, 2018, 07:59:30 AM
Lot of effort being done in the prep work.
Cannot wait to see when all is done.
Keep the images coming please.
Title: Re: Speaker for fun :)
Post by: Curlycat on March 10, 2018, 07:59:22 AM
I like the idea of the wood cladding. I am sure it is going to look great when finished.
Looking forward to see your progress.
Title: Re: Speaker for fun :)
Post by: Larry on March 10, 2018, 08:30:06 AM
Looks awesome  :2thumbs:

I really wish I had these skills!
Title: Re: Speaker for fun :)
Post by: SeanS on March 15, 2018, 09:00:53 PM
Some pics... all work is a few spare minutes here and there..

1) Side panels being convinced to stay on the birch ply.. notice the Federal Barbells have had them since I was 14  :boxing:..
2) back angled sides on... tick.. quite a mission but essential for WAF..
3) The remaining sides for the other speaker.... and my good yellow friend in the background.. we have shared some fantastic times :)

Hope to have these in a sand, sand, sand, sand, sandable condition for next weekend..Lots of work before the end of the road.

(https://i.imgur.com/FGWtAgX.jpg)

(https://i.imgur.com/N0ImdA6.jpg)

(https://i.imgur.com/oaKTdiP.jpg?1)

Title: Re: Speaker for fun :)
Post by: fuz940510 on March 16, 2018, 07:50:42 AM
(https://i.imgur.com/oaKTdiP.jpg?1)
Looking great so far, and nice MTB in the background!
Title: Re: Speaker for fun :)
Post by: Heinrich on March 16, 2018, 08:59:16 AM
Finish... I have 60 strips in 70 x 4 x 120 american walnut, sanded to 100 grit.. that wasn't cheap  :giggle:... but I think the finish will be worth it.

did you have this cut and sanded?
if so where?
Title: Re: Speaker for fun :)
Post by: SeanS on March 16, 2018, 10:00:37 AM
did you have this cut and sanded?
if so where?

Went to "Franco & Son Woodwork" in Durbanville, very nicely done..
Title: Re: Speaker for fun :)
Post by: SeanS on March 16, 2018, 10:04:00 AM
Bought the wood from African Lumber traders... they had by far the best price and selection I have seen.
Title: Re: Speaker for fun :)
Post by: SeanS on March 25, 2018, 07:19:01 AM
and all cladding is on with a sand to remove excess glue etc. today sand some more and then open the holes...

Then I need to start looking at options to finish.. I have seen the use of tung oil with a wax/ish sealer looks nice I'll need to experiment a bit.

Light blotches just rain drops with sawdust.. it actually nearly rained in CT.



(https://i.imgur.com/Du7KpCx.jpg)

(https://i.imgur.com/ITZ1uzS.jpg)

(https://i.imgur.com/6HY79J5.jpg)
Title: Re: Speaker for fun :)
Post by: Atjan on March 26, 2018, 05:09:38 AM
Love your work Sean!

Sent from my SM-G950F using Tapatalk

Title: Re: Speaker for fun :)
Post by: Heinrich on March 26, 2018, 08:11:49 AM
Turned out very nice.
Title: Re: Speaker for fun :)
Post by: PhillipJ on March 26, 2018, 10:00:14 AM
Looks brilliant!!!  :2thumbs:
Title: Re: Speaker for fun :)
Post by: SeanS on March 26, 2018, 10:05:07 AM
Looks brilliant!!!  :2thumbs:

Thanks.. scary part lies ahead, making the holes without any ripping, got to put on the slow/steady hat... may find a gap this evening.
Title: Re: Speaker for fun :)
Post by: Mongoose on March 26, 2018, 07:41:53 PM
Looks interesting, and judging by the sound of the build I heard at your place a while back, I can just imagine what these will sound like. Good going
Title: Re: Speaker for fun :)
Post by: itscraig on March 26, 2018, 08:45:02 PM
very very nice work
now seeing that you only have time to build speakers, send me your address so i can come and collect that bike
to get the dust off  :whistler:
Title: Re: Speaker for fun :)
Post by: SeanS on April 14, 2018, 12:19:43 PM
At last some time to work on them this morning..

- holes opened, no mishaps ...whew!
- Put a stripe down the back as there was a glue line I was not going to work around given the low angle of the join (..lesson). Will make it black.

Next... last job with the router, my driver cutouts are too deep, on purpose, to allow me to get the edge trimmer bit in. I could have cut holes once the could cover was on, but then there is no room for error, I need room. Horrible job as I'll use MDF to make spacers (horrible stuff), mmm.. or offcuts of walnut .. :thinking:

Then sand, sand, sand some more, add some sort of finish and, think about feet.. mount drivers and then the real fun can start. Crossovers in a cold rainy CT winter.  :ROFLMAO: an impossible dream.

Boxes are heavy / sturdy, I must weigh them.


(https://i.imgur.com/iigHDBq.jpg)

(https://i.imgur.com/jnSxzjL.jpg)
Title: Re: Speaker for fun :)
Post by: Heinrich on April 16, 2018, 06:58:43 AM
lookin good!!
Title: Re: Speaker for fun :)
Post by: Rhino on April 16, 2018, 09:25:04 AM
Really looks great.
Title: Re: Speaker for fun :)
Post by: PhillipJ on April 16, 2018, 09:27:04 AM
WOW!!! That looks so NICE! I can't wait to see the finish  :rubhands:
Title: Re: Speaker for fun :)
Post by: Nicholas on April 16, 2018, 10:09:01 AM
Hi Sean, great job, that is lovely wood.

What is your plan with the clear coat?
Title: Re: Speaker for fun :)
Post by: SeanS on April 16, 2018, 10:30:47 AM

What is your plan with the clear coat?

I want something matt/satin, not a high gloss lover. I still need to investigate, worst case I will fall back to Woodock 10 & Wax.. trying not to though!
Title: Re: Speaker for fun :)
Post by: Atjan on April 16, 2018, 02:38:16 PM
I'm sure these are going to look fantastic!  :2thumbs:

Could you not do a rubber gasket? I'm thinking decoupling & more error proofing in one. Should be A LOT less horrible to work than MDF as well.
Title: Re: Speaker for fun :)
Post by: SeanS on April 16, 2018, 08:58:08 PM
I'm sure these are going to look fantastic!  :2thumbs:

Could you not do a rubber gasket? I'm thinking decoupling & more error proofing in one. Should be A LOT less horrible to work than MDF as well.

I have suffered the MDF cloud, tackled it after weetbix & before a swim & work.. was once again amazed at how it vaporizes... I'd suggest avoid avoid avoid unless you wear 3 dust masks .. Birch ply is worth the cost, rigidity & lack of MDF cloud.

My driver depths are now just right. I have previously gone with a deeper than needed depth and compensated with  seal of sorts to buffer (mid). This time I'm coupling properly to the baffle. Tweeter will have some decoupling, I'll go rubber there using some garage door seal.

I'm hoping to have drivers in the boxes this time next week.
Title: Re: Speaker for fun :)
Post by: kenvanraas on April 18, 2018, 08:59:04 PM
Looks incredible Sean!  :dop: Very very happy for you.
(Where to with the old ones now? lol)
Title: Re: Speaker for fun :)
Post by: SeanS on April 18, 2018, 09:02:48 PM
(Where to with the old ones now? lol)
...there are no old ones...  just other ones :giggle:... you must come visit

Title: Re: Speaker for fun :)
Post by: kenvanraas on April 18, 2018, 09:11:41 PM
 :dance:
(Hey,again thanks for my F5  :dance:)
Title: Re: Speaker for fun :)
Post by: kenvanraas on April 18, 2018, 09:16:26 PM
(Will do sir   :thumbs:)
Title: Re: Speaker for fun :)
Post by: SeanS on April 18, 2018, 09:25:04 PM
:dance:
(Hey,again thanks for my F5  :dance:)

hope it is resulting in happiness  :thumbs:
Title: Re: Speaker for fun :)
Post by: kenvanraas on April 18, 2018, 09:46:23 PM
lol.you know the f5 amp gives a stage!
Im happy to sacrifice brute power for that  :dop:
Title: Re: Speaker for fun :)
Post by: SeanS on April 22, 2018, 09:21:48 PM
I spent about 5 hours today sanding...all by hand, my wife told me it was rude to the neighbors droning away with the electric sander all day  :whip: :whip:... but the result is great. ready for finish.. 150/180/220/280/400 grit, 4 sides, with some ding filling in-between.

Now the finish will be a face off between tung oil / wax or Danish oil / wax or Woodock 10.. hoping the Woodock loses. Discovered Hardware Centre, mmmm.. I could get lost there.
Title: Re: Speaker for fun :)
Post by: GECO on April 22, 2018, 10:31:32 PM
another option you should explore(https://uploads.tapatalk-cdn.com/20180422/911d87e8ec53a74a87901d9d9d05364d.jpg)
Title: Re: Speaker for fun :)
Post by: SeanS on April 23, 2018, 06:49:31 AM
another option you should explore

Ok I saw that one there.. i have usually used similar with woodock. I have bought this to try, with an untra fine steel wool. If that does not work I'll get beeswax.

Going to try do some tests tonight  :rubhands:.. move beyond the dusty phase.

(https://www.liberon.co.uk/wp-content/uploads/2016/11/Wax-Polish-Black-Bison-150ml.jpg)
Title: Re: Speaker for fun :)
Post by: SeanS on April 24, 2018, 08:56:32 PM
Ok.. tests done and finish chosen... tung oil.. Woodock 10 rubbed right back and wax Polish. .. Looks fantastic.  Will have then complete this weekend.. 👌.. the cabs.
Title: Re: Speaker for fun :)
Post by: kenvanraas on April 24, 2018, 09:02:42 PM
 :dance: :dance: :dance:
Title: Re: Speaker for fun :)
Post by: SeanS on April 25, 2018, 09:27:44 PM
this is approx where I'm heading.. zoomed in, bad light, reduced coat numbers.. etc.. but in real life  :drool:.... Sunday, finish will be complete and then fun.. fun.. fun..

Tomorrow I'll go buy allen bolts.. the rounded top ones (they have an official name, I Know, don't use them often enough to remember the name  :thinking:)


(https://i.imgur.com/gGhPzcn.jpg)
Title: Re: Speaker for fun :)
Post by: pwatts on April 25, 2018, 11:06:36 PM


allen bolts.. the rounded top ones (they have an official name, I Know, don't use them often enough to remember the name 

Domed head?
Title: Re: Speaker for fun :)
Post by: Schalk on April 25, 2018, 11:17:29 PM
At Screwman known as BUTTON HEAD, I use them all the time. Lovely looking boxes those.
Title: Re: Speaker for fun :)
Post by: vinyljan on April 26, 2018, 09:15:47 AM
At Screwman known as BUTTON HEAD, I use them all the time. Lovely looking boxes those.

@SeanS..not sure where you're located, but have been following this and looking forward to see the final product/finish.  Sorry, highjack...but do you guys/girl know of any suppliers of "fasteners" that will be open tomorrow or saterday :thinking:
Title: Re: Speaker for fun :)
Post by: SeanS on April 26, 2018, 11:04:19 AM
beginning of the end... coat of Tung oil + 1 coat of Woodock, many rounds of ultrafine steelwool, woodoc.. repeat... wax...

Cold weather will slow me down.... slightly. been given 2 thumbs on WAF.

(https://i.imgur.com/e46lbSo.jpg)
Title: Re: Speaker for fun :)
Post by: Heinrich on April 26, 2018, 11:22:12 AM
looking good
Title: Re: Speaker for fun :)
Post by: Rhino on April 26, 2018, 07:04:22 PM
Looks great, really neat finish.
Have many hours of fun listening.
Title: Re: Speaker for fun :)
Post by: El Sid on April 27, 2018, 11:14:56 AM
. been given 2 thumbs on WAF.


Thumbs up or down?  ;) :point:

Anyway, get 10/10 on BAF (bro acceptance factor - unfortunate acronym) - lovely!
Title: Re: Speaker for fun :)
Post by: Atjan on May 01, 2018, 01:08:40 PM
Those are some fine looking cabs!

Sent from my SM-G950F using Tapatalk

Title: Re: Speaker for fun :)
Post by: SeanS on May 01, 2018, 03:57:31 PM
Those are some fine looking cabs!

Sent from my SM-G950F using Tapatalk

they are finished and looking better, will add drivers and add photos..
Title: Re: Speaker for fun :)
Post by: SeanS on May 01, 2018, 08:36:36 PM
dark photies from a cr&p phone late at night.. but some polish has done the trick...

(https://i.imgur.com/WHoWanp.jpg)
(https://i.imgur.com/OzSWWoY.jpg)
(https://i.imgur.com/fRXcz6q.jpg)
Title: Re: Speaker for fun :)
Post by: SeanS on May 01, 2018, 08:42:19 PM
Just to be clear I used polish, not someone polish... I did this all myself :)
Title: Re: Speaker for fun :)
Post by: Chingy on May 02, 2018, 09:57:24 AM
these looks amazing Sean, well done

So when can i buy your other speakers you build  :whistler:
Title: Re: Speaker for fun :)
Post by: Larry on May 02, 2018, 10:53:33 AM
Looks great, I'm following this thread with interest!
Title: Re: Speaker for fun :)
Post by: PhillipJ on May 02, 2018, 06:18:13 PM
Man, jy kan!!!  :2thumbs: :2thumbs: :2thumbs: That looks so good - awesome stuff
Title: Re: Speaker for fun :)
Post by: SeanS on May 07, 2018, 05:48:32 PM
Getting closer....

Drivers in & wired direct to the back terminals, I'll start with external crossovers, the terminals give me a neat way of accessing the drivers.

Finish, not 100% happy with but I'll wait and see, the wax finish scratches easily, I'll live with it for a month and change if needed.

The color is not as red as it looks in the photos, decent photos on the weekend.

All the fiddly things done, it is amazing how many little things there are to do.

Now I just need crossovers, maybe I'll just buy something off the shelf from Zakspeed  :giggle:

Edit.. just added another pic, darker but closer to the real look (pic1)

(https://i.imgur.com/1iQtZGB.jpg)

(https://i.imgur.com/TwoI6ve.jpg)

(https://i.imgur.com/yru1MPR.jpg)

(https://i.imgur.com/28VxJzm.jpg)

Title: Re: Speaker for fun :)
Post by: Curlycat on May 07, 2018, 06:38:57 PM
Man that's looking DARN good! The wood really came out lovely  :2thumbs:
Title: Re: Speaker for fun :)
Post by: Family_Dog on May 07, 2018, 07:25:55 PM
Those speakers are really something to be proud of, very expertly constructed. They certainly do not take second place to any commercial speaker of the same ilk.


-F_D
Title: Re: Speaker for fun :)
Post by: CAD on May 08, 2018, 12:30:46 PM
(https://i.imgur.com/yru1MPR.jpg)

Damn ,for a fun project those came out looking darn good with some serious drivers.

Well done  :2thumbs:
Title: Re: Speaker for fun :)
Post by: naughty on May 08, 2018, 02:46:09 PM
agreed that it looks great and also agreed that those are some serious drivers - so when you get the crossover right it should sound pretty damn good for what you have  :thumbs:
Title: Re: Speaker for fun :)
Post by: SeanS on May 08, 2018, 05:02:58 PM
agreed that it looks great and also agreed that those are some serious drivers - so when you get the crossover right it should sound pretty damn good for what you have  :thumbs:

I'm hoping to get some in the box measurements tonight,  :rubhands:, may be slightly delayed as I  need to complete the post woodwork cleanup & check all my connections & kit  to do measurements... and revive the brain.. But I have all the XO components so plan to move relatively fast.
Title: Re: Speaker for fun :)
Post by: Atjan on May 14, 2018, 07:52:15 AM
Those fun speakers came out looking lovely.
How's the xo build going?

Sent from my SM-G950F using Tapatalk

Title: Re: Speaker for fun :)
Post by: SeanS on May 14, 2018, 08:15:34 AM
Those fun speakers came out looking lovely.
How's the xo build going?

Sent from my SM-G950F using Tapatalk

Did measurements on Saturday & XO #1 is soldered & ready to go. Got Flu on Thursday which has slowed me down somewhat. I need some material to kill internal resonances, there are some glitches on the impedance curve as expected, boxes only have dog blanket on some walls.

If all goes well I may be able to put some sound through them tonight / tomorrow night.

I don't expect much from XO#1.. but it will give me a feel for what lies ahead.

Title: Re: Speaker for fun :)
Post by: SeanS on May 19, 2018, 05:38:37 PM
WHEW... listening to XO #1 (ish)...

Sounding good... nothing is radically off, drivers integrate well.. my port tuning ended up exactly where I wanted it.. approx 36hz.. you can see a very untidy XO hanging out back. It's currently a straight 3 way, will also try 3.5 at some stage. My XO didn't measure exactly as modelled, not far off but not good enough for long term. But later in rounds I'll get more pedantic.

Placement... plonked down & powered up... and I can hear the front port was a good plan. My box is really haphazardly stuffed, I need to do it properly there is a bare piece of birch ply directly behind the 2 bass drivers  :facepalm:.

(https://i.imgur.com/8GDm0K6.jpg)
Title: Re: Speaker for fun :)
Post by: Larry on May 19, 2018, 06:53:27 PM
A truelly epic looking speaker.

And sounds like its coming together well too!
Title: Re: Speaker for fun :)
Post by: Chingy on May 19, 2018, 10:11:06 PM
Dibs on the two boxes next to them amd the opposite ones ;D
Title: Re: Speaker for fun :)
Post by: kenvanraas on May 19, 2018, 10:59:37 PM
^^^ ...there are no old ones...  just other ones :giggle:
Title: Re: Speaker for fun :)
Post by: SeanS on May 20, 2018, 07:33:13 AM
^^^ ...there are no old ones...  just other ones :giggle:

That's exactly right :)
Title: Re: Speaker for fun :)
Post by: RobertChicken on May 20, 2018, 03:38:59 PM
Great work those cabinets turned out rather good, very nice colour too! The "other" speakers look cool too.
Title: Re: Speaker for fun :)
Post by: SeanS on June 07, 2018, 09:27:41 PM
things are moving forward... on XO 1.3 and every twist moves me in the right direction. They are sounding good. A few gaps to address, but that's the fun..

Saturday's plan is to look at optimizing the cabinets / bass / room response. Some significant changes happened in the week.

They have some decent competition in the garage but the plan is to develop them in their own right and then compare, both (+1) have different strengths which is interesting.

At last I have reached the fun part of the build!!
Title: Re: Speaker for fun :)
Post by: Enigma_2k4 on June 15, 2018, 11:10:47 AM
OMG those are beautiful! Very very well done!
Title: Re: Speaker for fun :)
Post by: LouisF on June 15, 2018, 06:24:03 PM
If this is what you produce for fun I can't wait to see what you come up with if you are getting earnest...
Title: Re: Speaker for fun :)
Post by: SeanS on June 15, 2018, 09:14:15 PM
If this is what you produce for fun I can't wait to see what you come up with if you are getting earnest...

 :giggle: .. I need to make things to stay happy!

XO has had a decent mod and they ere getting close to respectable  :O0:
Title: Re: Speaker for fun :)
Post by: PJFourie on June 19, 2018, 12:17:40 PM
Stunning work Sean! How did you do the holes for the drivers?


Sent from my iPhone using Tapatalk
Title: Re: Speaker for fun :)
Post by: SeanS on November 30, 2018, 10:09:08 AM
Ok.. some time has passed and work has been ongoing with some big gaps. I'll give some info on where I have ended up.There have been a few changed along the way and there will be some small tweaks but expect it will remain largely the same.

Have moved from using Speaker Workshop to SoundEasy, however still switch between the 2. SE for all measurements, exported into SW

On the box, I had wanted something that would reach upper 30hz, initially thought I would tune the box approx. 34 hz, both options would give an equal f3. Settled on 30hz on listening.(green)

(https://i.imgur.com/IOW0uGa.jpg)

This is the final box tuning, ended up as expected (merged port/nearfield, spliced with gated on axis)
(https://i.imgur.com/AnbYiVA.jpg)

more to come
Title: Re: Speaker for fun :)
Post by: SeanS on November 30, 2018, 10:44:36 AM
This are the mid / tweeter measurements (no xo), measured from in line with tweeters, it works out that the tweeter is approx 70 degrees ahead of the mid, looking at a 3k xo (11.5cm wavelength), 2,2cm accoustic offset.. but this will differ if mic position goes up and down. But this is where I'll start work as tweeters are close to ear level.

(https://i.imgur.com/8vrVhfV.jpg)
Title: Re: Speaker for fun :)
Post by: SeanS on December 01, 2018, 11:51:15 AM
This is the modelling of the XO which is overall 3.5 way.. 4th order between Mid/Tweet (3000hz), 2nd order bass / mid(lower 300hz). The mid LP is not strictly 4th order electrical but the acoustic result is 4th order which fixes the phase diff introduced by the flat baffle. I tried various different topologies but kept ending up here. Below 200hz is in line with the modeled box pic, it rises approx 2-3 db before the 39hz f3.

ON straight 3 way, the bass seemed too prominent, I was initially back and forth on this, and different rooms may have different preferences. On lower order XOs mid/tweeter the mid ends up playing a good few db down with the bass/tweeter overlapping more, I preferred the cleaner mid contribution.

The dip at 1k I left as is vs. fiddling which fixed the line but messed with everything else... on listening its not noticeable, and its relevance will vary based on up/down left right etc. It is due to an impedance wriggle in the driver response.. not box / stuffing related or fixable.



(https://i.imgur.com/V0m8A8z.jpg)

Om impedance... they are quite low due to the parallel 8r Drivers lowest is 3.25R @ 90Hz, the rest above 4r. Electric phase worst is 75hz, 54 degrees and 4.2R.

(https://i.imgur.com/luwwtqJ.jpg)

Phase between mid and tweeter is lovely in my opinion :)
(https://i.imgur.com/SkLNuDo.jpg)


Title: Re: Speaker for fun :)
Post by: Brian J on December 02, 2018, 07:57:53 PM
I heard these recently they look and sound fantastic!!!
Title: Re: Speaker for fun :)
Post by: SeanS on December 03, 2018, 11:05:02 AM
I heard these recently they look and sound fantastic!!!
Thanks Brian, they have had a few tweaks since you heard to nudge them the right way :)... I plan to post some measurements, am currently one armed so slightly slow to get there :)
Title: Re: Speaker for fun :)
Post by: Shonver on December 03, 2018, 11:21:38 AM
I heard these recently they look and sound fantastic!!!

Totally agree!

... am currently one armed so slightly slow to get there :)

Oh, dear! I hope you're going to be alright.
Title: Re: Speaker for fun :)
Post by: SeanS on December 03, 2018, 06:14:49 PM
Oh, dear! I hope you're going to be alright.
.. getting there, fell off my bike, broke my shoulder, now I have a bionic one :).

on measurements..

on axis is as expected (gated on axis), the notch out of phase is now at 3k, changed things slightly. I forgot to hit save on off axis measurements but the rolloff is very even.
(https://i.imgur.com/M0tuhrR.jpg)


Pulse response
(https://i.imgur.com/XPGn5Hn.jpg)

in room measurement with REW, both speakers from approx listening position

(https://i.imgur.com/8mSDpdz.jpg)

Spectograph of above, some room perticulars showing themselves, Im ok with them, we co-exist :)
(https://i.imgur.com/39Xt36Y.png)