The Iso-Max Concert-1 is a single channel direct box designed to drive an unbalanced instrument signal distances to 100 meters (300') or more without high frequency loss or introducing noise into the signal path.
The design begins with a rugged extruded aluminum enclosure and steel slide-in inner tray with recessed zones at each end to protect the switches and connectors. At one end, left and right ¬" instrument input and thru-put are wired in parallel with a handy 3.5mm mini TRS for laptops and tablets. A mono sum switch enables the Concert-1 to take two inputs from the input and thru and mix them together, allowing two input signals to be summed mono to a mixer. A -15dB pad decreases input sensitivity for greater signal handling when interfacing line level sources. At the other end, a XLR male output with ground lift makes for easy connection. This is supplemented with a 180§ polarity to help phase align the signal and reduce feedback caused by acoustic hot-spots on stage.
Inside, a high-performance Jensen JT-DB-EPC transformer provides galvanic isolation as it passively lowers the impedance and performs the balancing. A high 140 k? input impedance reduces loading, enabling low-output instruments such as a vintage Fenderr bass to be connected without losing tone. As hi-Z instruments are particularly sensitive to noise, internal Faraday shielding protects against interference from RF. An external MuMETALr can further protects the sensitive internal workings to ensure a quiet interference-free performance even when surrounded by magnetic fields from amplifiers, power supplies and stage light dimmers.
With over +22 dB of signal handling capacity, the Concert-1 direct box gracefully handles extreme signals such as those produced by digital pianos while producing a warm Bessel response that is often referred to as `vintage' sounding. These features combine to make the Concert-1 the ideal choice for studio or live use.