API Mic Preamps with Digital Output

The API A2D features of a pair of API 312 Mic Preamplifiers that feed an A/D section with a set of standard digital interface outputs, multiple sample-rate choices and internal or external clock options. Analogue gain knobs are offered so that the level feeding the converters can be kept clean or driven harder for a punchier and warmer sound. The A2D analogue section consists of the circuitry contained in two 312s, half of that of the popular API 3124+. A level control pot with an expanded 20-segment metering system shows precise mic gain levels, while control switches include polarity, 48v phantom power, input pad, Mic/Line select and 2:1 transformer routing, which selects a lower gain contribution from output transformer. Each analogue input contains a balanced low-Z input XLR connector and a high-Z instrument input on a ¼-inch jack. The digital section of the A2D includes two API discrete 2510 amplifiers with level pots to adjust the feed to the A/D converters, each with a corresponding 20-segment calib...