R-509 Single Band VCA Compressor

€ 560

ARREL Audio R-509 is an advanced mono band VCA compressor, conceived to offer to the 500 series user the superior audio performance of the ARREL audio high level products. The R-509 is characterized by high reliability, rugged design, outstanding audio quality, versatility and ease of use typical of the tradition of ARREL Audio products. The R-509 is characterized by an extreme flexibility in a single slot 500 module. It includes the following features:

One of the most interesting feature of the R-503 is the possibility to patch the unit from the front panel (Bantam jacks) for an easy connection to other modules avoiding the access to the back panel.

The R-509 is characterized by high quality input and output buffers, new topology for envelope detector and VCA architecture, Attack and Release three position switches, LO cut switch on the envelope detector, Compression Ratio ranging from 1:1 to ∞:1 (limiter) and Variable Threshold in the range [-20dBu, +12 dBu], Flexible metering system (Gain Reduction, Output Level), Side Chain External input, Side chain stereo link (on the backplane lunchbox), True by-pass function.

The R-509 coupled with the R-503 and the R-501 ELITE allows to build a complete channel strip by patching the modules using the BANTAM connectors on the front panel with an incredible added flexibility.

R-506 is the one of the ARREL 500 series modules (the other models are R-501,R-501 ELITE, R-502, R-503, R-504, R-505, R-506) designed to give to the professional user the best audio tools for its application. To obtain an outstanding audio quality, no servo amplifiers are used in the R-506 so it is not possible to unbalance the line out of the R-506.

Number of Channels: 1
Power Supply +/- 16 V DC, very low power supply currents with respect to the API 500 standard
Power Consumption 50 mA
Line Input Electronically Balanced,
Impedance 20KΩ,
Input Level +4dBu, Max +20 dBu.
Output Level Electronically Balanced,
Level +4 dBu, Max +28 dBu,
Output Impedance 100 Ω
Bandwidth 5 - 150 KHz +/-1 dB, perfect square wave up to 20 KHz
Distortion + Noise <0.003% ( typical 0.001%).
Front Panel Controls True By-Pass switch(LED),
OUT level knob, Compression Ratio control from 1:1 to ∞:1 (limiter) ,
Threshold knob (-20, +12 dBu),
Attack switch: three positions (slow, mid, high)
Release switch: three positions (slow, mid, high)
Metering selection switch: two positions (Gain Reduction, Output level) True By-Pass switch (LED),
Rear Panel Input Connectors API 500 compatible connector, Backplane link connection
Front Panel Connectors In-Out Bantam jacks
Stereo link connector
External side chain connector
Construction Compliant 500-series rack with PSU and external audio connections,
Single 500-series rack slot required for each R-501 module.
Dimensions API 500 standard
Weight TBD kg.

    R-509 Key-Technologies


    Large Bandwidth (LB) means a very fast transient response able to represent the original sound with the maximum temporal resolution. LB is required to improve the perception of a “real sound” and to represent the details of the original sound.

    Large bandwidth plus very low total harmonic distortion means a perfect square wave reproduction.

    Ultra Low Noise (ULN) active and passive components and ULN design techniques. This requirement is especially important when the audio bandwidth is large as in the case of ARREL Audio products.

    High Dynamic Range (HDR) means that the saturation probability of the output stages is very low. This is obtained by using special rail to rail circuits and by increasing the power supply voltage of the analog circuits.

    Electromechanical tolerance means that electromechanical components are doubled in every situation in which maximum reliability it is important due to a frequent use (switches, push buttons, potentiometers).

    Through Hole technology means the maximum reliability in terms of thermal and mechanical stresses especially for connectors and electromechanical components.