A little more explanation why designing with certain cables in mind is in their design:
http://spectralaudio.com/bulletins/0314.pdf
http://spectralaudio.com/bulletins/0314.pdf
Traditional solid state amplifiers have always employed output terminating networks to provide an impedance or compliance to accommodate the load of the speaker cable and crossover in order to protect the amplifier. Unfortunately, the problems associated with using conventional output networks are severe, ranging from non-linear and unpredictable loading behavior to magnetic field propagation and noise [ack: Recall the Halcro amps which were locating the output inductor far, far away from the circuit board]. All these problems degrade amplifier performance and sonics. In Spectral amplifiers the sources of these distortions are eliminated. Stabilizing networks, resistors, chokes and inductors are replaced with tailored precision woven cables which eliminate non-linearities, noise propagation and magnetic fields. Now the signal from the output devices to the cable load is pristine, isolated and uncompromised by passive component problems.
Precision Output Interface Cables
In the DMA-300 dedicated output interface cables connect the high power output devices directly to extternal speaker cables. These are massive wires inside the amplifier that have large copper conductor cross sections to handle high power. They are constructed from fine oxygen free wires in groups with a stranding configuration that cancels both magnetic and electrical fields. This configuration along with dedicated matching components at the opposite end of the speaker cable assures a seamless and precise transmission path between output devices, loudspeaker interfaces and crossover components in speakers. Its carefully tailored impedances provide a high frequency compliance that smoothly transitions or steers electrical currents between the positive and negative CMOS output fets. Responses throughout the whole system are powerful, fast and extremely quick settling.