My InDIYana 2020 build (I hope to go)

jhollander

I like how these are turning out so I'd thought I'd share.  Still need more assembly before I get to hear them.  Probably call them Linkwitz tribute speakers or mini LX521

 

jhollander

Thanks to Ani for the RS100P and Ben for the ND20FB

Kornbread

I like. 

ani_101

These are tiny... !!! How are you getting any bass our of them?

jhollander

More to come... F3 of 40

Mitchell_Cote

Cool

6thplanet

Those are totally bitchin!!! 

dynamo

Wow those are great!

Ed_Perkins

Excellent job John!  Eager to find out more.

Billet

Those look really nice.  I'm just happy to see more open baffle bass in the mix.

Wolf

Those look great, John! Are they meant for free-standing on stands, or on the floor?
Look like ND90 or ND91, but I would hope more for ND105.
Can we see the backs?

Wolf

BTW, where did '521' come from anyway? 5 dual-radiation-drivers, 2 tweeters, and 1 system?

In that case for a name- 4 drivers, 1 tweeter(?), and 1 system?
Nah- 411 has been used by Keith Kidder some many years ago. 4 woofers, 1 mid, one tweeter.

A play on structure perhaps-
90 or right-angle V for the woofers, variant-edge for diffraction reduction midrange and same for tweeter.
"Right Drifters" (I hope you can see how I pulled that from the agendas.)

PWRRYD

John mentioned that the mid is a RS100P, so judging from the picture I'd guess ND105's with a custom round trim ring and the fugly plated magnets sprayed satin black.  I love the contrast between the light colored wood and the black drivers and trim pieces.  But what is going on above the ND20FB?  Does Mel approve?

ugly_woofer

Nice work John!

jhollander

The real speaker is Linkwitz's LX521 here https://www.linkwitzlab.com/LX521/LX521_4.htm
and here https://www.linkwitzlab.com/LX521/PhotoGallery.htm

So this is a tribute to SL's design.  Years ago I got SL's permission to make this speaker.  His biggest warning was "it's not going to sound the same" 

Anyway the woofers are generation-1 ND91s with an AL trim ring.  I'll post some more pictures later.  Melody likes the speaker but is not sure about the stands

6thplanet

What's the fake tweeter done with?

jhollander

Ink jet slide off decal paper.  I can send you a sheet if you want to try it out

Wolf

I meant more like- what is the naming scheme for the LX521- er- why did he call/name it that?
I like the design, and it really looks great.

Ed_Perkins

From SL's website:

"I changed the project name to LX21 as this experiment might now become my 21st completed loudspeaker design. After several iterations I found on 5/21/12 a baffle shape that worked well with SEAS CA22RNX and FU10RB drivers."

and 

"For its sonic qualities, wide range of applications and an important date in its development, I call it the LX521 Reference Loudspeaker. 

After listening to a great variety of good, bad and so-so stereo recordings I am tempted to call it MAGIC521. The music comes through!"

dcibel

In a week we can all celebrate LX521 day!

jhollander

I'm adding a few drawings to document the build here.

Wolf

Can you show us the physical xover photo? It's obvious WHY they are in the bases... That's a doozy and reminds me of me...

Wolf

BTW- is the large LCR on the woofers a cavity resonance killer?

squamishdroc

Cool build John!

jhollander

The spilt inductors on the woofers allowed me to keep the BBC dip while bring up the response to 1K for a better match with the mid. I'll see if I can find a picture. I know I have a drawing.

6thplanet

.....that John...he's so crafty!
Cool speaker man👍🏻

4thtry

So that is why these sounded so good. Control the mid-range glare with split inductors. Thanks for sharing.

rjj45

Awesome! Thanks for the docs. Wicked crossover!

ani_101

Very nice mini linkwitz lx521. sounds and looks great - the woofer mounting look was surprising!