R-505 3 Band Parametric Equalizer (6 Center Frequencies)

€ 610

R-505 is an advanced single-channel parametric equalizer conceived to offer to the API 500 user the superior audio performance of the ARREL Audio high level series products. The unit offers to the 500 user high reliability, rugged design, outstanding audio quality, versatility and ease of use typical of the tradition of ARREL Audio products.

The R-505 equalizer is based on the Livio Agentini’ s "Single-Stage Parallel Configuration" patented design. This innovative phase coherent EQ design offers the lowest distortion/noise specifications, not available in other products.

The R-505 filtering section offers three band LO, MID, HI controls (bell shape). The emphasis/de-emphasis control range is +/-14 dB, the three primary bands become six by using three central frequency buttons (F x 3). The Q control value (narrow, mid, wide) is selected by three switches (one for each band).

A bypass button is used for a true analog by-pass function (LED).

R-505 is the one of of the serie of equalizer that ARREL Audio conceived for the 500 series (the other models are R-502, R-503, R-504) in order to give to the user the best choice for its application.

R-505 is dedicated (due to his absolute sonic level quality) to high professional vocal recordings, classical instruments, high dynamic range instruments such as drums and percussions.

Number of Channels: 1
Power Supply +/- 16 V DC, very low power supply currents with respect to the API 500 standard
Power Consumption TBD
Line Input Elecronically Balanced,
Impedance 20KΩ,
Input Level +4dBu, Max +20 dBu.
Output Level Electronically Balanced,
Level +4 dBu, Max +24 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 button (LED),
Gain (Emphasis/De-Emphasis) pot control with center detect (3 controls), Range +/- 14 dB ,
Central Frequency: pot control (3 controls),
Frequency band control; three buttons (Frequency x 1, Frequency x 3 (3 controls)
Q control:three positions switch (narrow , medium, large (3 controls).
Frequency Bands LO: Bell shape 20/70 Hz (F x 1), 60/210 Hz (Fx3),
MID: Bell shape 200/700 Hz (F x 1), 600/2100 Hz (Fx2),
HI: Bell shape 2.000/7.000 Hz (F x 1), 6.000/21.000 Hz (Fx2).
Rear Panel Input Connectors API 500 compatible connector
Construction Compliant 500-series rack with PSU and external audio connections,
Single 500-series rack slot required for each R-501 module.
Dimensions Standard API 500
Weight TBD kg.

    R-505 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.

    Special patented circuits guarantees very low phase distortion in ARREL equalizers and filters.