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With the Cortex 15S, a small, living room-friendly floorstanding speaker has been designed, which already knew how to amaze with its performance during the development phase. The three 15 cm woofers with their three dedicated power amplifiers and a precisely adjusted equalization curve ensure surprisingly mature levels and impressive depth in medium-sized listening environments. Thanks to the 2 ½-way crossover, there is no unfavorable overlapping between the woofers in the mid-range, although the sound pressure from all three is available in the bass range. The connections are located at the bottom of the floorstanding speaker so that connecting cables can be routed and laid close to the floor.
AMT Tweeter
The Air Motion Transformer (not to be confused with the visually similar \"ribbon\") is a special sound transducer whose basic principle was developed by Dr. Oskar Heil. Unlike conventional cone or dome tweeters, which in principle use a piston-like back and forth movement to displace or suck in air, here an accordion-like folded foil is moved in the magnetic field, which pushes air out of its gaps or sucks it in. This principle means that less mechanical material movement is required to generate the same sound pressure and acoustic distortions are reduced. Due to their geometric design, the sound of AMTs is somewhat more focused vertically as the frequency increases. This can have sonic advantages because reflections from the floor and ceiling are reduced.
DSP
With ABACUS active loudspeakers and subwoofers, the crossover, i.e. the division of the signals according to the frequency range, and the optimization of the loudspeaker characteristics are always carried out actively, i.e. before the power amplification (unlike with passive loudspeakers, where the already power-amplified signal is separated and influenced by coils and capacitors). Depending on the loudspeaker series and the associated complexity and price-performance ratio, ABACUS does this with analog filter circuits (e.g. C-Box, Trifon, Oscara) or, as here, with a digital signal processor.
The built-in digital signal processor (DSP) performs a wide range of different tasks without increasing the complexity of the components immeasurably. The DSP used in ABACUS provides countless filters, takes over the function of the active crossover, linearization of the frequency response, phase and delay corrections and, on top of that, switching and control functions. Once the signal has been digitized, it can be processed as required without any loss of sound quality, because every filter and every control function is then just a computing task that is processed at a high clock frequency. The time delay caused by the processor is only approx. 0.3 ms.
- 2.5-way floorstanding speaker
- 4 Dolifet power amplifiers
- RMS power (total): Approx. 80 W, distributed over all channels
- Frequency response: 16…80->20.000 Hz
- Bass Roll-off: Continuously adjustable from 16 Hz (-6dB) and from 24 Hz to 80 Hz (-3dB), below -12 dB/oct. in each case.
- Bass-Pad: Range below 250 Hz continuously adjustable from -8 dB to +2 dB
- Tweeter: AMT
- Low frequency driver: 2x 152 mm/4 Ω
- Mid-bass driver: 152 mm/4 Ω
- Net enclosure volume: 15,5 l
