Content Summary : How to Connect a Three-Way (Six Speaker) Legatia Speaker System to a 4-Channel Amplifier in a Quasi-Active Crossover Configuration Hybrid Audio Technologies highly recommends the use of active crossovers for the Legatia range of products. This white paper focuses on how to connect a 3-way, six-speaker Legatia system, including Legatia L631-3, Legatia L641-3, Legatia L831-3, Legatia L841-3, Legatia L631-3 Pro, Legatia L641-3 Pro, Legatia L831-3 Pro, and Legatia L841-3 Pro, using a four-channel amplifier or two two-channel amplifiers with built-in lowpass and highpass electronic crossovers.... The premise of this design takes advantage of the Legatia-series midrange (Legatia L3 and L4) ability to effectively reproduce the extent of their bandwidth into upper midrange and treble frequencies without significant cone break-up (distortion). In the vast majority of high-end sound systems, no lowpass crossover is needed for the Legatia midrange drivers. The only crossover that is required for the midbass is a lowpass crossover to remove the vocal information in music from the midbass, and the only crossover that is required for the midrange is a highpass crossover to protect the midrange speakers from low frequencies. In virtually every four-channel amplifier manufactured today, a lowpass and highpass electronic crossover is included. In all cases, Legatia midbass and midrange drivers begin to attenuate (roll-off) at a rate of 6 dB to 9 dB per octave, on average, at the extent of their frequency response (for the Legatia L3 and L4, this can be as high as 10,000-12,000 Hz in most installations). This design takes advantage of the Legatia midrange natural roll-off; no additional lowpass capability is required, and the midrange are connected directly to the amplifier.