Audio Signal Processors - BDL-135

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Tech Sheet


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Thanks to the dynamic digital signal processing with frequency shifts that range from 2 to 12 hz, the BDL-135  antilarsen guarantees a considerable reduction of interferences  that may occur in an audio installation when the sound signal from a speaker returns to the system through one or more microphones.



The BDL-135 digital processor is able to reduce the effects of acoustic speaker-microphone feedback (Larsen effect).

 This occurrence is typical in sound systems which are obliged to have their  microphones positioned in the same direction of the speakers (churches, congress halls, etc.). The system allows you to adjust in digital mode all parameters for a perfect audio intelligibility  allowing you to minimize the Larsen effect. 


The Belltron  BDL-135 digtal controlled antilarsen is safe and easy to use as it has no knobs subject to tampering. The system has keyboard locking feature to avoid accidental tampering of the parameters. The values can be adjusted using the six buttons and  keyboard locked too. The parameters can be clearly seen on a LCD display.


The special technology used in manufacturing the BDL-135 system, having digital signal processing, guarantees a perfect high level sound. The antilarsen can be connected to the IN/OUT sockets of any amplifier, preamplified amplifier and power amplifiers. The systems allows for frequency shifts from 2 to 12 Hz.


The quality and reliability of Belltron products are tested and safe. Using proprietary technology, which characterizes every single electronic device, Belltron is pleased to offer a distinctive Made in Italy product. The high quality factory made productions promote the good name of the company, which is an excellence for electronics in the ecclesiastical world.




Belltron offers its customers a maintenance service at a 360° range to make their daily work easier. These services include : software that meets specific requirements, system information and simple online ordering constantly available, technical support by qualified Belltron technicians by phone, timely intervention in case of system failure.


Warranty covers the Belltron product from the purchase date from an authorized dealer. The quality and reliability of all Belltron products are tested, thanks to a thorough quality control on every single component made by a dedicated team before they are placed on the market. All our products are conceived, designed and manufactured in Italy entirely in-house.

Dati Aziendali

Sede legale: Aeris elettronica Srl
Via Antonio De Nino n°22 (zona Ind.le Vallecupa) - 64010 - COLONNELLA (TE) - ITALY
P.Iva/C.F.: 01643200676

Capitale sociale: € 80.000,00 i.v. - CCIAA di Teramo - REA 140706
La società non è in stato di liquidazione. La società non è a socio unico.