Tribute to Lansing-Heritage-Forum and DIY 2405 & 2446 & E145 build

[audiomagnate]

Is it possible to fall in love with speaker ports?...

As long as you keep it platonic I think you'll be OK.

[Dr.db]

Hi,
I Only do not agree to run the midrange at 1,2Khz as high pass.

Appropriate note I have to admit!
I have thought quit a while about the correct crossover between the E-145 and 2441 and did several listening tests.

1,2khz is very high for a 15" cone, but it works. I´m shure it´s not the most audiophile solution for the E-145, but it was the best compromise in my opinion.
The E-145 sounds very clean in the upper frequency range besides a nasty resonance at about 1,6khz.
It does get more beamy than a JBL 2123 up there though...

But the JBL 2397 / westlake midrange-horn hasn´t got a large hornmouth area and sounds rather thin below 1khz.
Moreover I have made the experience, that crossing compressiondrivers (too) low results in a stressed and distorted sound. I like to keep the crossover well above the actual cut-off freq. of the horn...
Maybe a Yuichi or TAD horn would have been a better match with the E-145 due to its ability to really reproduce sound from ~600hz upwards.

[Mr. Widget]

Appropriate note I have to admit!
I have thought quit a while about the correct crossover between the E-145 and 2241 and did several listening tests.

1,2khz is very high for a 15" cone, but it works. I´m shure it´s not the most audiophile solution for the E-145, but it was the best compromise in my opinion.
The E-145 sounds very clean in the upper frequency range besides a nasty resonance at about 1,6khz.
It does get more beamy than a JBL 2123 up there though...

But the JBL 2397 / westlake midrange-horn hasn´t got a large hornmouth area and sounds rather thin below 1khz.
Moreover I have made the experience, that crossing compressiondrivers (too) low results in a stressed and distorted sound. I like to keep the crossover well above the actual cut-off freq. of the horn...
Maybe a Yuichi or TAD horn would have been a better match with the E-145 due to its ability to really reproduce sound from ~600hz upwards.

Agreed 100%... might consider a 1000Hz crossover as a "better" compromise, but one would want to built the variants and compare them.

I do think a larger horn and a 700-800Hz crossover would be better still... not so sure about dropping the crossover to 400-500Hz.


Widget

[Dr.db]

These are the midrange circuit boards for the 2446 (2441 dia):




This is one of the high-freq. circuit board for the 2405:

[Dr.db]

All circuit boards together.
(...missing the 1,5mh inductor on this pic)

[berga12]

My intention was not to argue , of course if you had already experimented with your components that's fine!

Maybe the E145 have a better midrange response compared to other 15" (for example also the D130 was historically used in a 2 way).

on the distortion at 400-500hz it depends also on the power you are going to use, if you drive the mid high with a nice 2-3Watt tube amplifier there are no problem about distortion, important is always to be 2xFc of the horn.

Nevetheless, amazing work, I'm also using Mundorf components, on the modern ages, those are the best no-compromise and they have many price range for every poket.

[Dr.db]

My intention was not to argue , of course if you had already experimented with your components that's fine!

No worries!
This is a forum and open to any opinion. I would say a good discussion is always welcome and important!

[ivica]

No worries!
This is a forum and open to any opinion. I would say a good discussion is always welcome and important!

Hi Dr.db,

Your work is really astonishing.
One question, why not make Yuich-A290 horn like, instead of 2397 like, and use it from about 1000Hz (may be even 800Hz)
I believe that A290 would make better driver LF frequency horn loading then 2397.

regards
ivica

[Ruediger]

... JBL recommends baffling for the 2397. See the data sheet. This has nothing to do with the 1 kHz xover frequency but it may influence your diy design.

Ruediger

[Dr.db]

@ivica:

Actually the only horn of these two I have personally listened to has been the 2397. So I did choose the "safe" way and build the horn I knew...

The yuichi looks very tempting but without having listened to one I didn`t want to base my project on one of these...
Maybe I´ll build one of them in the future and change the horns, but so far I really like the 2397.
Besides that, I have never seen a detailed plan of these horns including all flares and angles....


@Rüdiger

Thanks a lot for your hint!
I believe that is because of pattern control, right?

Unfortunatelly I didn`t know about this circumstance and havn´t included these aspects in my project.
The horn will be mounted on top of the bass-enclosures. It is too late to integrate them in the baffle as the bass enclosures habe been finished.
Besides that, I think it is much better looking this way! Allthough I´m a fan of the mantra "form follows function", aesthetics do matter a lot and with such big boxes in the room they simply have to look good.
But everyone´s taste is different.

[Dr.db]

There are 3 pairs of binding posts in total.
One is for amplifier input.
The other two are for the high and mid output of the internal crossovers.
The high and midrange horn are mounted separatly on top, that is why there are crossover outputs on the back.




Here are my individual signboards out of solid brass. It is in german but I´m shure you guys will know what it says!




Here is another close-up.
The brass is about 3mm thick. The engraving is reasonable deep but still clean sight. The brass has been lacquered to avoid eventual oxidation.

[Ed Zeppeli]

What, were they out of gold?

[Odd]

Again fantastic work.

The project has been ongoing for some time?
"Anno 2007"?

[ivica]

@ivica:

Actually the only horn of these two I have personally listened to has been the 2397. So I did choose the "safe" way and build the horn I knew...

The yuichi looks very tempting but without having listened to one I didn`t want to base my project on one of these...
Maybe I´ll build one of them in the future and change the horns, but so far I really like the 2397.
Besides that, I have never seen a detailed plan of these horns including all flares and angles....

Hi Dr.db,
May one day these attached data would be useful.

All the best

ivica

[Dr.db]

@Ed Zeppeli: Only brass....

@Odd: I started woodworking in 2007, not this project

@ivica: Thanks a lot, that are some very useful plans!! Are these horns identical with the TAD horns ?