The LS-1000 (LS-1800 on some markets) was the largest model in the Linear Response Speaker System lineup introduced by Trio-Kenwood in 1981. The LS-1000 has a high-rigidity enclosure with angled and reinforced back panel (no sound absorbing material inside), mirror imaged construction and separate enclosure for the midrange and tweeter. The 28cm woofer has a high-rigidity ribbed cone paper, die-cast frame and it uses a special mounting method. Instead of the usual screw mounting they are installed utilizing a bayonet mounting similar to the one used for photo camera lens. The 10cm acrylic resin flat diaphragm mid-range and the 3.6cm carbon fibre tweeter are mounted on a die-cast front panel while the cross-over frequencies are at 800Hz and 6kHz.
If you look closer at the speaker terminal of the LS-1000 you will notice an extra set of terminals labelled "Sigma Drive". This enables the loudspeakers to be used with Kenwood's "Sigma Drive" amplifiers. Kenwood's exclusive patented "Sigma Drive" ignores traditional amplifier-speaker relationships by extending the amplifier's negative feedback loop past the output terminals, all the way to the speaker terminals. "Sigma Drive" ties a speaker's behavior directly to the amplifier's performance, which produces an unprecedented damping in excess of 600 at the speaker terminals and literally forces a speaker to behave in perfect sync with the amplifier. Technical data: 3-way, 3-speaker, linear suspension system | Power: 180W Max, 120W Rated | Frequency response: 32Hz-25kHz | Impedance: 8ohm | Dimensions: WxHxD 360x680x326mm | Weight: 33.5 kg.
