Active high-tech horn-loudspeakers of the reference class

Adeus ELYSIUM SL or: Why do people do that?

The question is understandably justified, but easy to answer: to develop our loudspeaker, we need a”calibration” to mercilessly uncover any weak points before someone else does. We have developed the loudspeaker system required for this purpose without the usual limiting criteria such as size, weight and cost, as this is all about the limits of technical feasibility.

Introducing: Adeus ELYSIUM SL – The Reference

At this point we refrain from descriptions for the indescribable and rather invite you for a personal listening experience.

The Speakers

All Adeus speakers are designed for operation with Adeus active electronics. There are no passive components such as coils, capacitors or resistors in the signal path. All loudspeaker chassis are connected to their power modules for best precision and control using loudspeaker cables (produced by Goldkabel exclusively for Adeus Audiofidelity – available as an accessory). As a sound transducer, very high quality and reliable electrodynamic systems are used, meaning that a mains supply for speakers themselves is thus eliminated.

Retail-price outside germany of the product, delivery, installation and dynamic calibration will be communicated on request.

Image shows the Adeus Elysium S


While we have taken a comprehensive attitude to insure that best individual components have been organised into a well-coordinated team, the playing conditions are unique for every setup – or to explain it with an old footballing wisdom: even more important than the line-up is the attitude. If anyone believes that due to a test victory or the high price of a reproduction system, the physical consequences of room size, wall distance, and reflectance would be subservient to awe, then we must unfortunately disappoint: physics cannot be deceived or bribed.

The best way to help is to respect the physics. With this is mind, we carry out extensive measurements and adjustments of the DSP control when setting up our playback systems. The accuracy of fit that can be achieved differs from conventional solutions such as a tailor-made suit in comparison to an off-the-hanger suit.

Measuring is important – but not everything.

Taking into account personal preferences, the final fine adjustments are made in person with our clients. To avoid any misunderstanding, we would be better off to claim commercially that “our customizable speakers work in every room”.

However, we will not claim this as it would be in divergence to the laws of physics. For an optimal playback experience to which our systems are capable the room acoustics should also meet certain basic requirements.

Often comparatively simple measures are sufficient – we are happy to advise you in this regard.


Active high-tech horn-loudspeakers – reference class

Room size 40 – 150 sqm and more

Specifications Adeus ELYSIUM: 

Three-way loudspeaker for operation with associated external active electronics Bass System:

Folded, open baffle with pulse compensation,

Baffle construction made of multiplex / granite composite with 3 cm granite Equipment:

4 x 18 inch driver per side

Total area woofer membranes: 0.96 sq.m.

Linear stroke +/- 5 mm

Air displacement in the linear range 9.6 liters total

Lower limit frequency, linearization, time correction and room adjustment via active electronics adjustable

Medium – treble – system: 94 cm spherical waves horn Coaxial 2 inch, horn driver with ring radiators

Efficiency> 110 dB / 1 watt / 1 meter

Crossover frequencies 250 Hz and 6500 Hz (via active electronics)

Dimension bass module: 56 x 89 x 56 cm (W x H x D)  * plus 1.5 to 2 cm, the bass module has adjustable feet

Overall dimensions incl. Horn: 174 x 94 x 64 cm (H x W x D)

Weight: 245 KG

Related active electronics: Adeus Force Majeure (see technical data Active electronics)

Technical changes are reserved.

Adeus      FB Adeus


High performance active electronics – DSP-controlled active electronics with 6 built-in amplifiers for driving a stereo pair of 3-way speakers including volume control and source selection

Complete electronics with source selection of analog and digital inputs, volume control, extensive signal-processing capabilities and six power amplifiers for operating a three-way stereo pair of Adeus speakers, also suitable for the integration of external power amplifiers.

Technical specifications:


4 x stereo via RCA jacks
1 x stereo XLR jacks
3 x coax via cinch sockets up to 192 kHz / 24 bit
3 x optical via Toslink sockets up to 96 kHz / 24 bit
Signal Processing:
Sampling frequency 96 kHz for analog and digital signals
Asynchronous sample rate converter for Fs = 44.1 kHz / 48 kHz / 96 kHz / 192 kHz

Functions signal processor:
IIR filter functions
6 x EQ per channel: Gain: -12 dB to +6 dB / Q: 0.5 to 10.0 / Frq: 20 Hz to 30 KHz
Low pass per channel: 40 Hz to 10,000 Hz, 6 dB / 12 dB / 18 dB / 24 dB
High pass per channel: 15 Hz to 10,000 Hz, 6 dB / 12 dB / 18 dB / 24 dB
Characteristics High and low pass switchable: Bessel, Butterworth, Linkwitz.
Level channel (digital): -6 dB to +6 dB, in 1 dB increments
Level channel (analog): -20 to 0 dB in 1 db increments
Delay Channel 1 to 6: 0 to 5355 mm (15.8 ms) in 3.6 mm increments
LF outputs: 6 x via RCA jacks and 6 x XLR balanced for the integration of external power amplifiers

Power outputs:

Low tone: 2 x 800 watts into 4 ohms
Midtone: 2 x 280 watts into 4 ohms
Tweeter: 2 x 100 watts into 4 ohms
6 x connection via insulated screw terminals
Cable receptacle up to 10 mm², 4 mm banana plug or cable lugs Display brightness adjustable
including remote control




Despite sounding like a paradox: It takes a great deal of technical effort to make the influence of technology on music reproduction disappear and to allow a “untainted appreciation” of the music – as long as the standard of recording technology is also supported.

We focus on the technologies, materials and designs that deliver a pure and improved sound – surround sound spray and fairy dust are available elsewhere.



This may sound strange at first but a precision loudspeaker is the opposite of a musical instrument. While body resonances provide the characteristic sound of a guitar, a violin or a grand piano, these are reduced to the technical level made possible by our loudspeakers.

The composite material with large-scale application of heavy granite is admittedly many times heavier and more expensive than a classic wooden box loudspeaker. In our opinion, the significantly improved impulse response and the greatly reduced inherent sound justify this additional effort and expense. In addition, if you do not care about these technical aspects and you just like the appearance, the unique feel and the touch of eternity, which emanates from a massive case of polished granite, for example in the design “Nero Assoluto”, then that is also totally acceptable.



Like the non-sounding of the speaker cabinet, the precise electro-acoustic conversion through the speaker chassis is of equal importance for a natural sound experience. We therefore use only high-quality and reliable components that pass our strict entry and exit controls.



The Adeus electronic and speaker combinations are actively controlled systems with “open” architecture. The electronics contain all necessary amplifiers for the operation of the speakers. In addition, it is possible to use external power amplifiers via preamplifier-level outputs – if e.g. a particular amplifier technology such as tube or Class A transistor is preferred.

Within the scope of the calibration, the tuning of different amplifiers is possible in a wide range with respect to constant phase and amplitude curve.

A subsequent change of amplifiers usually requires a readjustment of the control parameters and is only advisable if appropriate electro-acoustic measuring equipment is available. Because the connection between the amplifier electronics and the speakers is made by cable, certain types of cables can be specified – and, if desired, different types based on their suitability for bass, midrange and treble ranges.



Among professionals and connoisseurs alike, the advantages of actively controlled loudspeakers are well known and undisputed. DSP-based control extends the possibilities of propagation and operational time corrections further than before, increasing the precison of impulse behaviour and specifically adaptating listening conditions to room dimensions and speaker placement. So as not to raise any false expectations: it is important that the speakers are arranged in such away that they are not technically inhbited. Undesirable rough acoustics generated by room dimensions and design can be remedied by performing acoustic measures in the space itself – we are happy to provide advice in this respect. The replicable and consistent “short process” form is most appreciable when used in association with a high-resolution music server or network player. Here, music signals which are mastered in the Studio Master format up to 192 Khz and 24 bit, can be directly translated through DSP to our active speakers without further signal interference.

If admirers of the record player fear and expect a certain “digital coolness” or “digital hardness”, we will pleasantly have to disappoint: not only can CDs be reproduced faithfully from such a studio master but records too. Such fears are only accounted for sound systems with analogue copying processes and signal conversions resulting in signal interferences. Even if you find the “sound” caused by the additional signal transformations charming, we can implement your preferences: in addition to the possibility of a true-to-life music reproduction, the DSP control offers numerous possibilities to realize your own sound ideas in a defined way. The interpersonal analogy to this subject matter would be something like: “A smart person can play dumb but it is more difficult for a dumb person to fake intelligence.”

*DSP = digital signal processor

Why does Adeus AUDIOFIDELITY only use DSP-powered active speaker systems?

While there is an almost unimaginable range of passive loudspeakers on the market, a specific niche is relatively overlooked:


The master class of loudspeaker construction: DSP-controlled active systems!

How many products do you find that are available in this audiophile class at reasonable prices? Apart from professional studio monitors in mostly pure “tool” optics, we do not know of any manufacturer worldwide that offers high-end loudspeakers of the absolute reference class at such fair prices as those obtainable with Adeus AUDIOFIDELITY through direct sales.

You can certainly spend even more money, but we’re pretty sure you will not get a “better sound” for said money. We guarantee you that Adeus products outperform any passive loudspeaker system currently on the market in terms of their ability to reproduce natural-authentic music.

The advantage that Adeus products have over their competitors (which also offer active and DSP-controlled active systems) is their future-proof external active electronics.


The advantages of external active electronics:



Explanation: sometimes “active speaker” is used as a synonym for “in-built amplifiers”. A better descriptive definition is that each branch of the loudspeaker is controlled directly by a separate power amplifier and the filter functions are performed before the power amplification. At this point we would like to forego a policy statement as to why the principle of “active loudspeakers” in the field of high-quality music reproduction is the most logical approach for the best technical outcome and how market forces are sometimes not aligned with this principle.

Thus, an Adeus loudspeaker system always consists of a central active electronic system which takes over the entire signal processing, power amplification, and the electro-acoustic conversion from a pair of loudspeakers which are liberated from filter functions.

Central active electronics already include preamp functions such as choice of digital and analogue inputs as well as volume control. Therefore, the operating mechanism and the connection of source devices corresponds to a conventional integrated amplifier, despite it being a fully active driven speaker system. High-resolution source devices such as music servers or streamers can be connected directly to the active electronics. The preparation and forwarding of the stereo signal is completed by active electronics without the need for external accessories.

The thermal conditions are usually more favourable with an unobstructed installation of the central electronic element than when installed in a loudspeaker casing. The outsourced electronics are exposed to much lower sound levels and resulting vibrations than when installed in the loudspeaker casing. In the case of a required service or upgrade, only the electronics module needs to be accessed. There is no need to disassemble or transport the complete loudspeaker. If you are see the potential of sound optimization in the area of loudspeaker cables and you want to experiment accordingly, you can select cables separately based on their suitability for low, medium and high frequencies.

The active electronics contain all the power amplifiers required to operate the system, but there is a significant difference compared to active speakers with built-in active electronics: external preamplifiers can be integrated via preamplifier outputs of our active electronics depending on the customer’s preference. For example, a small tube amplifier can be integrated for the very efficient (efficiency > 110 dB / 1 watt / 1 meter!) high-tone or high / mid-tone range. This is practically impossible in active speakers with built-in electronics. So, if up until now you’ve shied away from switching to a sonically superior DSP-controlled active system (e.g. because you did not want to outsmart your beloved and high quality (tube) power amps) here’s the solution: