OptiLevel®is a patent-pending "direct path" precision volume control system. Conventional potentiometers
use either carbon or conductive plastic tracks riveted to metal tags or pins with a "wiper" scraping over this
track and a second contact. This arrangement significantly degrades the music signal.
Digital volume controls, often used in high-end equipment, disingenuously channel the signal through
thousands of tiny transistors (i.e. inside an IC package). Hence, the signal is still excessively comprised,
often more so than the simple potentiometer.
Often vaunted as the ultimate volume control, so-called stepped attenuators combine rotary switches and
resistors to form a precision volume control of laboratory grade quality if implemented well.
However, stepped attenuators are often not remote controlled and usually offer only 24 steps with a coarse
adjustment, meaning the optimum volume for a given piece of music usually and annoyingly ends up some
where in between the available positions. Further the stepped attenuator being a purely passive device,
often lacks the proper drive required for the following stage, hence the dynamics of the audio signal is
AMR's patent-pending OptiLevel® direct volume control system, when channelled even through the most
complex route, the audio signal only passes through a maximum of just 3 premium-grade resistors employed
in series to control the volume. AMR also uses only the highest-grade gold plated silver contact relays
(as switches). In fact, the hermetically sealed relays provide a much more optimal switch than most rotary
switches used in stepped attenuators.