A 300
A 300
A 300
A 300


Self-powered FIRTEC-Main Monitor for all applications



KSdigital manufactures each of its loudspeakers by hand in its factory Saarbrücken/Germany. Each loudspeaker is measured individually (IFM) and linearized in frequency and phase. This ensures the unrivalled correct reproduction of the music signal.


With the introduction of the first FIRTEC controlled monitor KSdigital changed the kind of building professional monitors. The traditional way is the linearisation of the ampitude response. With the FIRTEC(TM) digital signal processing our attention is to reproduce a correct impuls response. This FIR-equalisation means a flat ampitude response and a flat phase response, which means a correct signal with all details in tone and time and stereo image. The products of the A-Line are the state of the art monitors for all applications: the bridge monitor in nearfiled application as well as the In-wall-solution for the big control room.

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A300 - 3-Way Main Referenz Monitor

Flexible setup with adjustable orientation of Mid-High-Unit


The A300 was conceived as a classic 3-way reference monitor with FIRTEC™ managed time-aligned sound reproduction. As with the legendary ADM20, all frequencies are radiated by the A300 so that they simultaneously arrive – not out of sync - at the ear of the sound engineer. The tonal neutrality and this time alignment permit its use in all areas of professional production processes, from the recording as a mix-monitor or in mastering as a last reference. The assembly with a 10” high-performance bass driver, a 2” calotte mid-range driver and a calotte-free, 1” high frequency driver transmits from 26Hz upwards and thereby offers at every volume level sufficient reserves. The conception of the amplifier and power supply ensure a low noise reproduction with virtually no distortion. Our patented FIRTEC system filter generates a linear phase, time aligned reproduction across the entire frequency range. The wave guides suppress the cabinet edges and also linearize the frequency range for digital signal processing. The implemented 1” high range ring radiator ensures a low distortion reproduction, even at a high volume. Whether connected via its analogue input with a 24 bit / 192 KHz AD-converter or digitally connected loss-free to a workstation. The amplifier’s accessible high- and low-shelving filter enables a fast room adjustment during its installation that can be enhanced with an optional RC-100 extra internal filter if required. The peak EQs as well as the high- and low-shelving filters are freely configurable and permit an adaptation at the listening position. Also the listening volume can be controlled directly at the monitor so that a full level digital connection at the master output can be guaranteed to be loss-free. Another speciality is the converter-less connection of the 3 PWM power amplifiers with 250W RMS each. This direct connection prevents converter losses and leads to an extreme resolution in timing as well as in tonal areas.



AD / DA converter 24 bit sigma delta, 64 x oversampling
digital IN AES3 format , 32 – 192KHz
analog IN XLR-symmetric
process FIRTEC™ equalization, FIR-crossover, limiter,
6 user filter
patent: 19823110
room equalization 5 peakfilter and FIRTEC™ system equalization
chassis 1'' radiator,
3" midrange-cone
10'' bassunit
amplifier 150W / 250 W / 250 W peak
SPL 118dB cont./124dB peak
remote control RC-100
frequency range 24 - 22000 Hz (+/- 3 dB)

56 x 30 x 40 cm, 18 kg

optional erhältlich