The stated reason was the pressure of the tense international situation - a German U-boat's torpedoing of the RMS Lusitania in May of that year cost 139 American lives - but many reporters suspected Wilson had simply got tired of them.
The Model Two makes use of the latest audio technology, including front and rear RCA pre-outs, subwoofer output and a built-in 25 watts x 4 channel RMS power amplifier.
As for hooking up to sound systems, the rig packs front and rear RCA pre-outs, separate subwoofer outputs and a baked-in 25-watt x 4 channel RMS power amplifier, to boot.