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Multi-Way Conventional loudspeakers with crossovers

Kapellmeister loudspeakers
Kapellmeister loudspeakers
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Old 18th August 2017, 12:49 PM   #11
mondogenerator is offline mondogenerator  England
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Default I got this book too....back when I was a newbie

Ok pun aside, I'm not much more than a newbie now, many years later....

However, ignore the naysayers if you want to go for it!

The Kapellmeisters as a concept aren't as terrible as some would have you believe.

IF you're looking for an aperiodic TL and hope to lose as much rearwave energy as possible, then they suit.

So too does Visaton Vib130TL.

I'm sure an aperiodic TL could be designed using MJK worksheets but I'm not sure how. Maybe Akabak can simulate?

Strides have been made which largely leave Bailey lines and things like the Kapellmeisters in almost pseudo science territory but they largely have a basis in science, just with one or two incorrect assumptions.

I still have no doubt, with the right drivers, losing the corner reflectors, and with a careful redesign the construction method and general premise make for a neutral and balanced output (almost Infinite baffle without the necessary home renovation) and could make for brilliant integration with a subwoofer.
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Old 3rd November 2017, 06:05 PM   #12
fasteddy13 is offline fasteddy13  United Kingdom
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Built a pair of these back in the 1990s.. Total cost was about 40 and they sounded incredible.. Stuck to the exact design and was able to get hold of the Altai's back then (10 per pair).. Unfortunately, they were made for a friend of mine who took them away after a couple of months, but during that time I repeatedly gobsmacked many audiophiles that had spent a small fortune on their own floor standers..
During construction, I was feeling a bit sorry for my mate as I assumed he would end up with a very inferior pair of speakers.. My word, was I wrong..
Anyone that has not actually heard these speakers, suggest you ignore them utterly.. If I could only find an equivalent driver (Altai's no longer available) I would joyfully set about making another pair.. These speakers totally changed the way I judge hifi, no longer will I do design by numbers, now I will only ever use my ears to assess any hifi unit..
Whoever Kapellmeister is, he is to be applauded, loudly, with stunning clarity and bass..
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Old 3rd November 2017, 06:55 PM   #13
Charles Darwin is offline Charles Darwin  United Kingdom
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Originally Posted by fasteddy13 View Post
Whoever Kapellmeister is, he is to be applauded, loudly, with stunning clarity and bass..
Kappellmeister is german for musical director (of a choir or orchestra).
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Old 3rd November 2017, 07:05 PM   #14
fasteddy13 is offline fasteddy13  United Kingdom
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Ah.. Well hats off to them for being a source of inspiration.. And a strong nod to V Capel.. Although my (poor) recollection is that the design came from an early 1960's American electronics magazine..
Is anyone aware of a full range driver to rival the Altai? Especially in price..
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Old 25th March 2018, 09:52 AM   #15
fasteddy13 is offline fasteddy13  United Kingdom
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Have finally found a cheap driver to rival the Altai (no longer available)
It is a Soundlab 8" 25w full range driver, 89db sensitivity and 38Hz - 18Khz (resonant frequency 45Hz).. Cost 20 for a pair..
Have re-jinked the Kapellmeister design to accommodate the different dimensions of this driver and am starting construction this week..
Not been this excited about hifi for many years and really looking forward to seeing if this all works as well as the original. Will try and make this a low cost project as before and will see if I can keep the cost down to below 75..
Have a cad drawing (draftsight, dxf file) if anyone wants this, but you might want to hold off until I have actually built and run them in..
Wheeeeeeeeeeeee....!
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Old 30th March 2018, 05:14 PM   #16
fasteddy13 is offline fasteddy13  United Kingdom
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Well I built them.. Re-worked the design a little so the port comes out of the front rather than the bottom..
Made with a friend of mine who got curious after all my blathering on about them.. Then he did something really mean and underhand, he offered me his Audio Innovations 500 valve amp as a swap and has now taken them..!
Sigh.. Was a huge success, sound fabulous and really pleased with them and can highly recommend the Soundlab drivers as a replacement for the Altai's.
We re-worked the design a little and made the TL port come out of the bottom front of the cabs, we reckoned the varying reports re the bass from these cabs was likely due to the different floor coverings people stood them on.. Firing the bass into the floor from the back of the cabs was likely to be a bad idea if one had a deep fluffy carpet..
Also made this pair out of chipboard but have already ordered all the bits to make another pair and these are for me and will be made out of plywood..
Will try and make these on a budget (1st pair had one or two costly bits, not my choice) and see how cheap they can be made for..

Click the image to open in full size.
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Old 30th March 2018, 07:57 PM   #17
planet10 is offline planet10  Canada
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Kapellmeister loudspeakers
i can’t help but think that moving to a modern TL design could extract more performance.

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Old 30th March 2018, 08:14 PM   #18
Borus is offline Borus  United States
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What about these makes them old?
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Old 30th March 2018, 08:38 PM   #19
planet10 is offline planet10  Canada
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Thet were designed using the Classic deign techniques that existed before proper modellers showed us what was possiblle, introduced useful tricks to increase performance, and showed up the many fallacies of classic design. The 1st clue is the end-loaded driver. Taking the simpla expedient of putting the driver on the “back” so that the driver is tapped part-way into the line will improve the reduction of ripple, allow the use of less damping and get more bass. But it would be better to just start from scratch.

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Old 12th July 2018, 06:12 PM   #20
sensai is offline sensai
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I built a pair back in the mid 90s, I still have them upstairs.

They were built exactly to spec. (I wasn't clever enough to deviate), but I found that there was a peak around 1khz (never knew why), were flat down to 250hz, then the response gradually fell away as expected from a single unit. However all this was compensated with a graphic equaliser. Also found that any speaker cloth had to be open weave or it dulled the treble.

The problem with the author's construction was that it was extremely difficult to replace a speaker, as I had to after blowing one when pulling out a phono lead without turning down the volume! On music signal though they would go quite loud.
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