Zero Distortion: Leif's System with TAD 4003 based dual FLH

[kodomo]

I have six woofers in groups of threes with each group having their own respective servo amps. My initial idea was to go for 6 per group (which I may still do in the future) but even with 3 per group I had better measured response, better blending and better sounding setup than all my previous efforts.

If I could go further, and hopefully in the future I will, I would actually want to manufacture my own higher quality drivers and upgrade the servo amps.

 

[christensenleif@msn.com]

in my opinion a servo is still running behind, however fast......it´s like a mechanical linear arm like the rabco

 

[morricab]

Yes this is 270 but his friend who has a TAD 4003 dual FLH uses JMLC 350 as he has a smaller room and the vertical space is more important for him. For Graham space is not an issue. Radian in Universum is in a JMLC 200T, and Markus Klug Altecs iirc are 270. So with those FCs, all the crossovers between 500 to 700 are possible and equivalent TAD, Altec, JBL, Radian, etc can easily be rotated as long as driver impedance is the same, with using LPAD to attenuate for driver differences. Regarding bass solution, Leif's is too big, I will look at slotted open baffle or Bill Fitzmaurice's bass horn or Lab subs, which don't cost much unless you beautify them like Living Voice does

The Universum uses a JMLC 200T and not a Min phase 200?

 

[Audiophile Bill]

Inspiring system, Leif. Enjoyed the read, Ked.

 

[bonzo75]

The Universum uses a JMLC 200T and not a Min phase 200?

Yes.

I think they use the oblate spheroid wave guide only on the horns mummies

 

[marslo]

Inspiring system, Leif. Enjoyed the read, Ked.

Me too, the female classical vocal is outstanding.
I have only one thing common with Leif system - the color of the horns
Thank you Ked for sharing your passion with us.

 

[Audiophile Bill]

Me too, the female classical vocal is outstanding.
I have only one thing common with Leif system - the color of the horns
Thank you Ked for sharing your passion with us.

Yes I agree - was my fave video too. Just shows the sheer quality of those TADs....

 

[morricab]

Yes.

I think they use the oblate spheroid wave guide only on the horns mummies

http://horns-diy.pl/horns/minphase/minphase-200/

As near as I can tell it's not an oblate spheroid...something like JMLC but more curved over.

 

[Alrainbow]

I did enjoy the article Ked , videos and all but why the constant WA bashing , why is this even necessary discussing Horns ...

 

[Alrainbow]

If it ain´t got that swing, it don´t mean a thing
just one thing;
it was first when I got horns in all "bands" that the sound snapped into focus and integrated 100%
BR, SLOB or even OB may have more fun factor, but my experience is that mixing principles in speakers, is/can be a suboptimal approach
the round alu amps in the first pic, are FW F5 with choke input psu...a pain to get working, but among the best ss amps I´ve heard

enclosed is link to my bassamps build
https://holtonprecisionaudio.com/bl...-power-hpa-nxv800-mono-block-tower-amplifiers

Wow sweet build ....!

 

[Audiophile Bill]

http://horns-diy.pl/horns/minphase/minphase-200/

As near as I can tell it's not an oblate spheroid...something like JMLC but more curved over.

http://horns-diy.pl/horns/minphase/minphase-200/

As near as I can tell it's not an oblate spheroid...something like JMLC but more curved over.

Hi Brad,

Ked is referring to the Horns FP10 and 15 which uses a SEOS waveguide:

The SEOS waveguide uses Dr. Earl Geddes' oblate spheroidal contour but with a linearly changing super-elliptical cross section.

 

[morricab]

Hi Brad,

Ked is referring to the Horns FP10 and 15 which uses a SEOS waveguide:

The SEOS waveguide uses Dr. Earl Geddes' oblate spheroidal contour but with a linearly changing super-elliptical cross section.

Hi Bill,
I was referring to the Universum mid horn

 

[Audiophile Bill]

Hi Bill,
I was referring to the Universum mid horn

Yes Ked is right - the uni mid is the JMLC 200T.

The FP10 and 15 are SEOS.

 

[marslo]

Interesting thing about Leif's design is that their concept is similar to Duo Mezzo , only the componentss and drivers are of highest available grade.
For me this design gives more coherent sound than Trios which are difficult to integrate with separate basshorns . It can be achieved but this is not an easy task imho, this is why Trios impressed me only once.

It's also the reason I did not change my Mezzo for Unis until now , their bass reproduction is compromised compared to mids and highs.

 

[kodomo]

in my opinion a servo is still running behind, however fast......it´s like a mechanical linear arm like the rabco

Not all servo are the same. Do not get hang up on the old servo approach what rythmik is doing is different. For more explanation on their approach: http://www.rythmikaudio.com/DirectServo.html

 

[christensenleif@msn.com]

interesting.....but I´d have to hear it to judge.....
why did you not go for a true sub horn solution....you seem to have the space....Runes company
have some real contenders
an aqaintance making all out WE horn systems have started delivering theese as the final bass solution
https://nnnn.no/devor/

 

[kodomo]

interesting.....but I´d have to hear it to judge.....
why did you not go for a true sub horn solution....you seem to have the space....Runes company
have some real contenders
an aqaintance making all out WE horn systems have started delivering theese as the final bass solution
https://nnnn.no/devor/

Because open baffle bass seems to load my room better and they can be physically time aligned with the rest of the system which is another step forward in coherency.

I also think the room and the speakers as one unit so the bass to horns are crossed over according to my rooms schroeder frequency. Above the schroeder (about 115hz) my horns work where directionality is more important, below the schroeder, ob bass takes over where room loading is more important. I also have treatments according to my measurements, so I have both good frequency response and a very linear decay throughout the band.

 

[morricab]

Interesting thing about Leif's design is that their concept is similar to Duo Mezzo , only the componentss and drivers are of highest available grade.
For me this design gives more coherent sound than Trios which are difficult to integrate with separate basshorns . It can be achieved but this is not an easy task imho, this is why Trios impressed me only once.

It's also the reason I did not change my Mezzo for Unis until now , their bass reproduction is compromised compared to mids and highs.

I wonder about putting the tweeter above the mid-horn vs. under the mid-horn like in the Duo Mezzo. From an integration POV, I would have thought under is the better choice.

 

[christensenleif@msn.com]

if I should have the tweeter below 270 horns it would have to be pulled back about half a meter for mechanical time alignment, which is the price of a passive filter and no dsp
to give it enough space I´d have to lift the 270 quite much and would loose integration, not gain
don´t think Ked was bothered by the 2002s on top at my 4+ meters listening distance
tweeters on the side between 270 and FLH is like the AG Trio solution where one couldn´t move the head sideways without feeeling hit by a beam of HF or NOT
tried tweeter centering on Trio too by lifting midhorn, but no success either

 

[bonzo75]

I wonder about putting the tweeter above the mid-horn vs. under the mid-horn like in the Duo Mezzo. From an integration POV, I would have thought under is the better choice.

I discussed these with Leif, whether to have bullet tweeter, a small compression driver instead of the bullet, inside, in between, or above.

He has an old one where it was inside