AUDIOZONE amps are basic designs with a minimum of controls and features. This style of design allows the amps to be repaired easily in case of break down or damage. The basic hand wired circuit is also user friendly if someone wants an amp modified at a later date.
AUDIOZONE amps may not be fancy. They don't have all the bells and whistles. They do sound good and keep working.
AUDIOZONE speaker cabinets are built with the same principles.