August 29, 2020 2 min read

In the June 2020 edition of Voice Coil magazine, Vance Dickason measures in detail the latest Radian Audio Engineering’s LT6 Horn-Loaded Ribbon Device.
   
Radian is a pro sound driver OEM well known for its great sounding compression and coax drivers, several of which have been featured in Test Bench over the last several years, including the 1.4” 835PB ferrite magnet and aluminum diaphragm compression driver featured in the February issue of Voice Coil magazine. However, the sample Radian sent for this Test Bench article was neither a compression driver nor a coax, instead it is one of its new waveguide planar transducers, the LT6 shown in Photo 1.
   
Intended to be a more hi-fi substitute for 1” compression drivers, the LT6 and all of the other new Radian ribbon high-frequency devices were designed by 35-year loudspeaker engineering veteran Igor Levitsky. Levitsky began designing planar ribbon drivers and speakers in the former Soviet Union in 1986 as a young engineer after graduating from Kiev Technical University in electroacoustics.
   
Beginning in 1995, Levitsky worked with Hi-Vi Research, where he developed a complete production process for manufacturing ribbon diaphragms. Over the next 20 years, Levitsky developed planar ribbon drivers and speaker systems for the consumer market for BG Radia (acquired by Christie Digital in 2014) and for the pro market with SLS Audio (acquired by Dolby in 2014). Levitsky also worked with OPPO and Dai-Ichi on the development of the award-winning OPPO PM1 and PM3 planar magnetic headphones. He joined Radian Audio Engineering in 2018 with the goal of bringing the latest planar ribbon technology innovations to the pro sound market. Levitsky holds a total of six patents on planar ribbon driver and speaker design.
SoundCheck CSD waterfall plot of the Radian LT6.
SoundCheck CSD waterfall plot of the Radian LT6.
    
Features for the LT6 waveguide ribbon transducer include a FEA-optimized neodymium magnet motor structure, Kapton diaphragm, a continuous power handling of 40 W AES with a 150 W short-term IEC power handing, a 1.7 kHz to 2 kHz recommended crossover frequency (with a minimum 12 dB/octave high-pass network), and a 1 W/1 m 103 dB sensitivity (average output across the operational frequency range with the LT6 waveguide). The LT6 waveguide directivity is 100° × 40° and is optimized for line arrays.
   
   


Also in Articles

Radian CR Coaxial Planar Ribbon Drivers and Their Application in Modern Audio Systems
Radian CR Coaxial Planar Ribbon Drivers and Their Application in Modern Audio Systems

September 20, 2020 4 min read

Read the Application Note about Radian's unique concept of using planar ribbon High-Frequency transducers in true coaxial drivers. Four models in the CR Series, ready to inspire you to design the latest in studio monitors, high-end home audio and immersive audio cinema rooms!
Read More
Radian Audio Engineering on Voice Coil Test Bench
Radian Audio Engineering on Voice Coil Test Bench

January 27, 2020 2 min read

For the February 2020 edition of Voice Coil magazine, Vance Dickason characterizes a new Radian ferrite compression driver. The Test Bench focus on Radian's 835PB ferrite 1.4” aluminum diaphragm compression driver. After reviewing several of Radian’s neodymium series of compression drivers, Dickason characterized the 835PB and noted how this driver continues to have the expected rich feature set that is the hallmark of the company.
Read More
Radian 475PB 1-Inch Compression Driver
Spotlight on the Radian 475PB 1-Inch Compression Driver

January 31, 2019 1 min read

In January 2019, Vance Dickason characterized the 475PB 1" compression driver from Radian Audio Engineering. This was the second ferrite motor compression driver from Radian to be featured in Test Bench, following the 745PB, covered in the December 2018 issue. The Radian 475PB has a similar set of features as Radian’s 745PB and includes a 1” throat diameter, a 134 mm × 19 mm ferrite magnet motor, a high-temperature 44.5 mm (1.7”) diameter polyimide voice coil former wound with copper-clad aluminum edge-wound ribbon wire voice coil, 50 W AES power handling above 800 Hz and 100 W program power handing. 
Read More