Appendix C – Biamplifying the LS-77 
AMR’s LS-77 speakers are designed from the inception with the option to be bi-ampliffied. This means that dedicated amplifiers are used to drive the low frequency driver and high frequency driver separately. This provides improved clarity and resolution, as the amplifier driving the high frequency driver does not have to deliver the large currents drawn by the woofer and hence will produce less distortion.
You must use two IDENTICAL stereo amplifiers to biamplify the LS-77 (AMR’sAM-77 has a build-in mode designed for optimum operation to biamplify any speakers, including the LS-77). You must also use two IDENTICAL pairs of conventional speaker cables or a special pair of “dual headed” Speakon connector cables available from yourAMR retailer.
Please refer to section 3.1 Setup - Connecting the loudspeakers for detailed information and tips on the different available connectors.
