QUAD 63 (and later) Delay Line Inductors

[esl 63]

And those delays should be SW controlled... both timing and freq response... And try to do an optimization for each room... ohhh.. this will be time consuming. Got to stop right here.

 

[jan.didden]

Not really. Potent DSP can do that for basically pizza money.

Jan

 

[mkc]

Hi Jan,

I have been googling a little bit after reports from ETF 2022. However, I have failed to find anything with you and your DD Quads. Was it only a presentation you gave?

Here is a link to Holger Barske's flickr album. Seems to have been a nice event. ETF 2022

Mogens

 

[jan.didden]

No I also demo'd the set. Maybe Holger missed that.
There were others taking pictures. I will check.
The presentation should eventually be on line but it may be restricted to ETF participants.
It was a nice event, interesting speakers (mechanical and human), and a great venue, an old castle.
What I found less interesting was dragging the large ESLs up 24 steps of stairs ;-)

Jan

 

[jan.didden]

A few pics of my setup.

Jan

 

[jan.didden]

How can I attache a .MOV clip?

Jan

 

[jan.didden]

BTW Either I'm a genius or LTspice is deranged.
I'm gambling on the latter.

Jan

 

[hesener]

A few pics of my setup.

Jan

Nice, is that white speaker an original 63?

 

[mkc]

Hi Jan,

Thank you for the pictures. Looking forward to the write-up.

Mogens

 

[jan.didden]

Nice, is that white speaker an original 63?

Its an ESL 989. Chinese production, 2013.
Refurbished by quadesl.nl in 2021.

Jan

 

[jan.didden]

I would like to share a short clip but I don't know how. I can't attach it to a post as it is 45MB in size ...
How can I do that?

Jan

 

[jan.didden]

Maybe this will work:

https://drive.google.com/file/d/1GtOyl4JwHh1nO9g_kygDhhFvMpI4q5oA/view?usp=share_link

Jan

 

[mkc]

Hi Jan,

Thank you for sharing the video.

Mogens

 

[jan.didden]

Did it work? It doesn't load at my side.
The site is extremely show here anyway.

Jan

 

[jan.didden]

Another one, both courtesy Martina Schoener:

https://drive.google.com/file/d/1lI0OYTvcjqFJz2eOJv59gxGgp73ceCyf/view?usp=share_link

Jan

 

[hesener]

Another one, both courtesy Martina Schoener:

https://drive.google.com/file/d/1lI0OYTvcjqFJz2eOJv59gxGgp73ceCyf/view?usp=share_link

Jan

loaded fine, great demonstration! Carla never sounded so sweet ;-)

 

[hesener]

One hour of work, and the coil board was taken out, checked, and reinserted - problem still persists. Another listening test with a signal generator indicates it is the panel on the top of the speaker,....

See attached picture, I checked the DC resistance of all coils in series (only one half shown) and tried to see if rattling them would cause a change, but nothing happened. All coils measured 3.1 ... 3.2H (measured with a PEAK LCR meter at 1kHz).

So, as ESL63 and others said, its the panels, not the coils. Thanks a lot anyway for the help!

 

[jan.didden]

I'm away till Sunday, I will measure the resistance of a coil when I get home to see if it is similar to your 33k.

Jan

 

[hesener]

each coil has ~5k, this is the six coils in series - I just thought it would be easier to measure all of them at the same time while moving things around

 

[1audio]

Jan-I see you have absorbing panels behind the quads. They help a lot. An important trick I have discovered- arrange the panels to reflect from Quad to the other panel. You get several benefits. First the reflections don't go back through the quad directly. Second you get two stages of absorption and its basically free.