BSS Audio FDS-366T

Oct 7, 2003 12:00 PM, Editors


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BSS Audio's new FDS-366T offers two new filter types that are designed around the Australian WHISEWORKS and Neville Thiele Method filters, which are comparable to Linkwitz-Riley 36 dB/octave and 48 dB/octave, but with steeper roll-off slopes of 36 dB and 52 dB per octave, respectively.

Features include unique filter topology “speeds up” the roll-off slope; like the Linkwitz-Riley topology, it maintains zero phase difference between adjacent bands throughout the crossover region (no polar pattern shift as frequencies move through the crossover region); and it maintains a flat magnitude response when acoustically summed.

The main advantage of the greater roll-off slope is, according to BSS Audio, loudspeaker designers should be able to open up the bandwidths of drivers and obtain greater efficiency over the frequency range. Most setups that use Linkwitz-Riley crossovers could be substituted by the WHISEWORKS and Neville Thiele Method filters. It should not be necessary to re-adjust any other settings, although speaker manufacturers and other high-tech users may be able to further optimize crossover frequencies when using the new filters.

"The electrical summation between bands with the new filters is razor-flat; I couldn't believe what I was seeing," said Martin “Ferrit” Rowe of ProMix Electrotec in Las Vegas. "They allowed me to put more power to the devices without fear of overload or over-excursion. Once adjusted, it sounds better than standard filters. The system seemed louder and clearer. We were setting off alarms in the car park!"

The FDS-366T builds upon the audiophile features of the original 366 in that the high-performance, 96kHz sample rate combined with 24-bit AD/DA conversion yields a dynamic range of greater than 114 dB. AES/EBU digital input, Alignment Assistant™, automatic phase compensation and three inputs/six outputs round out this tour sound tool.

Existing FDS-366 owners can upgrade to Version 2.0 by registering their units on the BSS Audio Website at

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