biquad alo 2 f


The Biquad two-line hybrid telephone interface, rack standard, to be used in radio and TV studios. Has an identical circuit of all the other ALO models and does not require the use of power supply making it easy to use. Allows the connection up to two listeners simultaneously.

Circuit similar to all other ALO models and does not require power from the mains, further facilitating its use.
It allows the connection of up to two listeners simultaneously.

It has RFI filters on its telephone line input and on audio inputs and outputs, avoiding electromagnetic interference.
It has a protection against electrical discharges from telephone lines, which protects the equipment.
Works on conventional telephone lines or PABX extensions with variations between 20 and 50V, with a minimum current of 20mA.
Balanced audio inputs and outputs with XLR connectors, isolated by transformers, guarantee high quality and noise immunity, providing clean and clear audio.
It has audio input gain control on the rear panel.
It allows the connection of up to two listeners simultaneously.
With completely independent hybrid circuits for each listener, allowing conferences between them through the mix-minus of the audio console.

The hybrid circuit (transformation of 2 into 4 wires) is fully electronic and active, with an adjustment for echo cancellation that provides insulation around 50dB @ 1KHz.
On the front panel, the equipment features an ON / OFF switch that answers the telephone call, a call indicator LED, which is active when the
equipment is in operation, a volume control for the return to the listener and an output volume control. audio to the mixing console.
Very versatile, ALO 2 is the ideal equipment to be used in broadcast and recording studios, in order to extract and insert quality audio in the conventional POTS telephone line.
Its cabinet has a high standard finish, with brushed stainless steel panel

  • Type: Standard telephone line input;
  • Connector: RJ-11 (6p4) female;
  • Characteristic impedance: 600Ω;
  • It works with voltages between 20 and 50 V of the central power supply (PABX accepted).
* For a perfect functioning of the equipment, it is desirable that the control panel supplies 50mA of current. ** The minimum working current is 20mA. Output
  • Type: Telephone line output to connect a conventional telephone device;
  • Connector: RJ-11 (6p4) female;
  • Characteristic impedance: 600Ω;
  • Mechanically switched output, when the equipment is inoperative the telephone output is an extension of the input. When the equipment starts operating, this output is deactivated.
Audio Input (Return to Listener)
  • Balanced Mono type, magnetically isolated by high quality transformer;
  • Impedance:> 10 kΩ;
  • Connector: XLR Female;
  • Gain Control: the gain adjustment on the rear panel allows input signals from -10 to + 4dBu.
* In addition to adjusting the work gain, the equipment provides the front panel with volume adjustment for the listener, which can be adjusted from -∞ to 0dB in relation to the audio input level. Audio Output
  • Balanced mono type, magnetically isolated by high quality transformer;
  • Impedance: <150Ω;
  • Connector: XLR Male;
  • Gain Control: -∞ to 0dB.
  • The nominal output level is 0dBu, but it depends on the quality of the telephone connection.
Hybrid Circuit
  • Type: Totally electronic without the use of transformers. The transformation from 2 to 4 wires is done by an integrated circuit specifically for this purpose;
  • Echo cancellation: adjustable on the rear panel depends on the electrical characteristics of the telephone line.
  • Protection against lightning strikes that prevents the equipment from burning.
* In the laboratory, the cancellation reached was 56 dB @ 1kHz; ** Good protection of the product is essential for the protection to work properly. Dimensions
  • Padrao rack (L x A x P): 482,0 mm x 44,5 mm x 120 mm;
  • 19” x 1,75” x 4,7” pol.;
  • Weight: 1.3 Kg without packaging;
  • 2.3 Kg with packaging.
BW Price Guarantee

(Subject to conditions)

Biquad ALO 2


Tech Support

2-Year Warranty


Related products