David build

For livingroom sound better than in a theatre.
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jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#16 Post by jammer »

Tom Smit wrote: Mon Aug 15, 2022 10:03 pm Erm, maybe I was thinking of when BB is being stained.
Oh yeah, I've using something like a pre-stain when staining in the past. Going for 100% clear with these though.

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Clef's of Bass
Posts: 60
Joined: Sat Dec 26, 2020 4:21 pm

Re: David build

#17 Post by Clef's of Bass »

this geometry hurts my head :bash:

great work dude! these should sound great

shrub0
Posts: 37
Joined: Thu Jun 07, 2012 10:32 pm

Re: David build

#18 Post by shrub0 »

Nice clean build Jammer. I used dark shellac on mine and it wasn't blotchy.
viewtopic.php?p=258774#p258774

I had dye stain recommended to me for baltic birch but I haven't tried it.
https://generalfinishes.com/wood-finish ... _ALhpMrL-Y

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Chris_Allen
Posts: 3355
Joined: Wed Jul 11, 2007 2:43 pm
Location: Huddersfield, UK

Re: David build

#19 Post by Chris_Allen »

Everytime I see a David, this is what I see:
dalek.jpg
Built:
6xDR200, 2xT39, 2xT48, 2xJack110, 1xOmni10.5, 1xAutotuba, 1xT18, 1xSLA Pro, 1xW8, 1xW10

CarterKraft
Posts: 255
Joined: Thu Oct 22, 2020 1:46 pm
Location: DFW

Re: David build

#20 Post by CarterKraft »

Excellent job on these, really well done.
Weldon Carter

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#21 Post by jammer »

shrub0 wrote: Thu Sep 15, 2022 3:09 pm Nice clean build Jammer. I used dark shellac on mine and it wasn't blotchy.
viewtopic.php?p=258774#p258774

I had dye stain recommended to me for baltic birch but I haven't tried it.
https://generalfinishes.com/wood-finish ... _ALhpMrL-Y
Wow, awesome build. I love the walnut corner pieces.

I used General Finishes satin clear for mine. I didn't love the finish, compared to the minwax water based I am used to using, but it'll do.

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#22 Post by jammer »

Chris_Allen wrote: Thu Sep 15, 2022 3:54 pm Everytime I see a David, this is what I see:

dalek.jpg
I had a similar feeling about Davids too, but after building these I think I love it.

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#23 Post by jammer »

I finally wrapped up fabrication of my Davids and brought them home. I'm blown away at how amazing they sound. I still have to run through some checks (per the instructions), but damn, these are amazing. Soon I'll measure them and post the charts.
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Last coat of General Finishes satin clear.
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I tried to add some space and re-orient the coils ... ?
IMG_9852.JPG
I used strips of velcro to attach the crossover to the cabinet so it will be easy to remove if I have to make changes. It's very secure and keeps down anything from vibrating.
IMG_9858.JPG
They're home.
IMG_9866.JPG

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Tom Smit
Posts: 7457
Joined: Sat Jan 05, 2008 1:24 pm
Location: Sarnia, Ont. Canada

Re: David build

#24 Post by Tom Smit »

Nice!
Note- you move Mr. Potato head.
Did you swap the cabs side to side? Any difference in SQ?
TomS

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#25 Post by jammer »

Tom Smit wrote: Tue Sep 27, 2022 8:07 pm Nice!
Note- you move Mr. Potato head.
Did you swap the cabs side to side? Any difference in SQ?
Ha, yes I switched them but no difference in sound quality.

shrub0
Posts: 37
Joined: Thu Jun 07, 2012 10:32 pm

Re: David build

#26 Post by shrub0 »

Jammer, Nice clean build. How do you like the sound?

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#27 Post by jammer »

shrub0 wrote: Wed Jan 11, 2023 10:18 am Jammer, Nice clean build. How do you like the sound?
I've spent a lot of time listening to these now and I'm very happy with the sound. Definitely one of the best sounding experiences I've ever had (but that isn't saying much....). They bring a new life and clarify to all of my favorite recordings. Some favorites are:
Dire Straits - Wild West End
Zenmenn - Bamboo Garden
Hiroshi Suzuki - Kuro To Shiro
Matome - Dreams
Black Sabbath - Planet Caravan
Shadow - D'Hardest
Rhythm & Sound - What A Mistry
Fleetwood Mac - Never Going Back Again (acoustic demo)

Low's 2018 record 'Double Negative' also sounds insane.

My only gripe is I feel they lack a bit of the 'punch' I want when listening to house and disco. I've started taking some measurements and comparing my room (which is far from ideal) to others to pinpoint what my ears aren't getting. My guess is the 4" mid-ranges can't deliver the feeling I'm looking for, but I could be wrong. When measuring I have all of the EQ flat, but when I'm listing I usually have my Sansui 8080 set up +4 on the bass. Here's my first measurement chart:
Screenshot 2023-01-22 at 4.03.35 PM.png
Screenshot 2023-01-22 at 4.04.09 PM.png

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#28 Post by jammer »

Also, some friends and I host a listening party every few weeks and we've been using these speakers. We pop-up in different spots, which is nice to be able to hear how they sound in different rooms.
Obviously we don't have much acoustic treatment for these popups (although the first one was at a recording studio so we rolled some gobos in.
IMG_0673.JPG
IMG_0730.JPG
IMG_0735.JPG

jammer
Posts: 19
Joined: Sat Aug 06, 2022 9:47 am

Re: David build

#29 Post by jammer »

I just took a few more measurements in my living room.
One from where I sit and listen to music and one from where I'm standing and mixing. Similar graphs for both.
The two dips in the low-end I see, one around 55 hz and one around 85 hz are what I think I want to fill in. Until I can determine if it's in the speakers or the room I guess there's not much I can do about it.

Next, I'll bring a speaker so another location and get a near-field measurement. I think there's too much going on (reflection wise) in my living room to get a decent near-field measurement.

Any thoughts on what the best next steps are?

Much appreciated!
living room.png
IMG_1627.jpeg
IMG_1628.jpeg
IMG_1629.jpeg

Grant Bunter
Posts: 6915
Joined: Mon Nov 28, 2011 11:12 am
Location: Ilfracombe Queensland Australia
Contact:

Re: David build

#30 Post by Grant Bunter »

It's likely to be the room(s), but remove a variable or two.
Unless the LF is coupled, it is likely to lose some content due to cancellation based on distance apart for the cabs.
And since chest thump is in that 50-70Hz kick drum region, any dips there could explain what you're experiencing.

Here's another way to identify what you're thinking is lacking.

Go back to those songs, and rather than play them via the Davids, analyse them with, say Audacity (search the net on how to use Audacity to determine content).
If the frequency response in the region measured in room is different to that displayed in content in audacity, then that helps determine the next steps (which is to remove the deficits without creating others at different frequencies)...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...

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