Acapella Audio Arts: The $650K Sphaeron Excalibur loudspeakers

Recorded in 24bit 96kHz at the Acapella showroom on May 13, 2019. We uploaded several of these videos. Please subscribe and check out our Acapella Sphaeron Excalibur playlist.

The Sphaeron Excalibur speakers weigh over 3000 lbs each, use a powered plasma (ION) massless tweeter and have four 18 inch woofers per speaker.

If you listen carefully, you will hear notes in the music you have never heard before. That is because the notes have been on the CD all along [which was uploaded to a music server for this demo] but no speaker has been able produce the notes correctly and distinctly before [having to do with the high efficiency of these speakers, the accommodating load they present to the amplifier, the ION Tweeter, etc].

And it is not just the notes, so much more emotion and excitement of the music is also audible for the first time.

Who knew that all our music had all this extra yummy goodness all along, but our speakers just kind of weren’t up to the task.

Associated gear (all extremely modest as these things go): Acapella “Audio One” music server, prototype of Acapella’s forthcoming dac/pre, new Acapella monoblock amplifiers.

People: Neli, of Audio Federation. Hermann Winters, of Acapella Audio Arts.



Mike and Neli went on a little audio adventure

Mike and Neli went on a little audio adventure to visit Audio Note in the U.K., the Munich High-end 2019 show, and the Acapella Audio arts factory where we listened to the Sphaeron Excalibur speakers (pictured) for most of the day.

Details galore forthcoming after sleep and uploading and sifting through several thousand photos, 100s of videos and many recordings of various systems in 24×96 hi-res audio.





Acapella Sphäron Excalibur – The holy grail of high-end audio loudspeakers

Acapella Audio Arts has upped the bar significantly with their new statement-level loudspeaker, the Spharon Excalibur:

Frequency range: 15 Hz to 40K Hz.

4 x 18 inch woofers per channel

Sensitivity: 103-107 dB / 1 W / 1 m

Impedance: 8 ohms.

Over 2500 pounds. Each.

1 x ION plasma tweeter per channel

From $620,000 a pair. Active version available for additional cost.

The specifications really do tell the story here. Very big. Very efficient. And, given the Acapella brand sound, it will sound like music, and not a high-school science-day project or mad scientist’s laboratory experiment gone bad.

Don’t believe it? Stop by the store in Duisburg Germany and hear for yourself.

That is exactly what the German Lite Lifestyle technology magazine did.

They go into quite some detail – it is a long article, but in German.

We translated the first paragraph to English below [you haven’t experienced life until you and your spouse attempt to translate the same bit of text together, let me tell you…].

Without further ado…

Acapella Sphäron Excalibur – The answer to all questions

What is the maximum amount of effort that we can put towards achieving the high-end ideal of pure, natural and undistorted playback of sound? How far can we go in pursuit of precision, vividness and coherence? An answer to these questions can be heard in Duisburg, where Acapella Audio Arts, renowned manufacturer of horn loudspeakers, has their rarely built Sphäron Excalibur on display. We seized the opportunity to listen to this magnum opus, and are happy to share our insights.


Audiophile power: The massive Sphäron Excalibur is 2.40 metres tall and occupies nearly 1.7 square metres. This loudspeaker system is finished in black acrylic cabinets with red horns.


Does anyone really need this level of performance? At the pinnacle of high-end audio, that is the wrong question. Here, one aims for a higher goal. One aspires to experience unprecedented quality. One strives for the maximum achievable performance, constrained only by the limits of known science and available technology. One ignores costs, number of materials and market analysis in order to gain new know-how at the leading edge of sonic reproduction. This is the driving force for Acapella co-founder Alfred Rudolph. After building the sensational Sphäron, the ultimate horn speaker system of that time, he asked: “Can it be done better? Will I be able to improve it further? Or, more poetically: “Can I, as in the Arthurian saga, pull this sword from the stone?” And so the Sphäron Excalibur was born.

More here.