Dynacord SL 900

Dynacord SL 900: a power amplifier designed for the demands of sound reinforcement

The Dynacord SL 900 fits the spirit of power amplifiers intended for demanding environments: mobile sound reinforcement, halls, clubs, places of worship, or fixed installations. The goal is clear: to provide stable, controlled amplification ready to handle varied loads while maintaining clean reproduction and comfortable headroom for transients.

With its Class H design, it aims for efficient operation over time, practical when the amplifier works long hours at sustained levels. Add to this a set of internal protections (temperature, current, DC, HF, etc.) and you get a power block oriented towards "field" use, made to deliver and last.

For which uses and users?

The SL 900 is aimed at musicians, sound technicians, contractors, and integrators looking for a PA power amplifier capable of driving passive speakers in various scenarios: classic stereo playback, bi-channel configuration, or bridged mode to maximize power on a single load.

It is particularly suitable for setups where control over dynamics and bass management (high damping factor) is desired, while maintaining excellent clarity at high volume. It is also a relevant choice when reliability is paramount: comprehensive protections, limiting, and calibrated ventilation for intensive use.

Key features and audio performance

Power and operating modes

The Dynacord SL 900 offers several ways to utilize its power depending on your speakers and wiring: nominal output, maximum mono power, maximum bi-channel power, as well as a bridged mode to concentrate energy on a single channel. This flexibility allows optimizing a system according to load impedance and desired level, whether powering 8 ohm, 4 ohm, or 2 ohm speakers.

Precision, dynamics, and operational silence

With an extended frequency response (10 Hz to 40 kHz at +/-1 dB), very low distortion rate, and high signal-to-noise ratio, the SL 900 is designed to transmit the signal precisely. In practice, this results in clean reproduction, good channel separation (crosstalk), and low output noise, appreciated in installations as well as live when the system is pushed.

LPN processing and built-in protections

The switchable LPN signal processing allows adapting the amplifier's behavior according to context, while the full set of protections secures the amplifier and speakers: audio limiters, high temperature protection, DC, HF, Back-EMF, peak current limiters, inrush current limiters, and power-on delay. Front-to-back cooling with 3-speed fans promotes coherent airflow in racks.

Technical specifications

Model	Dynacord SL 900	Damping factor at 1 kHz	> 300
Category	Power Amplifier	Slew rate	25 V/µs
Class	Class H	Signal-to-noise ratio	> 106 dB
Nominal output power	400 W / 4 ohms	Output noise	< -71 dBu
Max Mono power	1150 W / 2 ohms	LPN signal processing	switchable
Max Bi-channel power	650 W / 2 ohms	Protection	Audio limiters, High temperature, DC, HF, Back-EMF, Peak current limiters, Inrush current limiters, Power-on delay
Max Bridged power	1300 W / 4 ohms	Inputs	2 female 3-pin XLR
Max RMS output voltage	55.3 V	Outputs	2 Speakon + 2 male 3-pin XLR
Gain	32 dB	Power supply	240 V, 230 V, 120 V or 100 V; 50 Hz to 60 Hz
Input sensitivity (nominal power)	+2.2 dBu (1.0 Vrms)	Consumption	550 W
Maximum input level	+21 dBu	Main fuse	240 V / 230 V: T10AH; 120 V / 100 V: T20AH
Output impedance	20 kOhms	Cooling	Front-to-back, 3-speed fans
Distortion rate	< 0.03 %	Ambient temperature limits	+5 to +40 degC
Crosstalk	< -80 dB	Dimensions	483 x 421 x 88 mm
Frequency response	10 Hz to 40 kHz (+/-1 dB)	Weight	12.6 kg