The A2D represents a landmark achievement
for API; it is the first product ever produced by the company with an integrated
digital output. Recognizing the desire for a high quality solution to raise
microphone signals to a workable line level, we engineered one of our most
popular mic preamp designs into an enclosure with our new proprietary analog to
digital conversion. The result is a complete package - a pair of superb mic
preamps feeding an A/D section with a set of standard digital interface outputs,
multiple sample-rate choices, and internal or external clock options. Precise
control of both the analog gain as well as the level feeding the digital section
means that the mic signal can be maintained super-clean if desired, or driven
harder on the analog side for that whallop and impact that can only be achieved
by driving the transformer into saturation for that historic API sound!
The A2D analog section consists of the circuitry contained in two API
312 mic preamps, or one half of the popular 3124 quad mic preamp rack product. A
level control pot with an expanded 20-segment metering system shows precise mic
gain levels. Control switches include polarity, 48v phantom power, input pad,
2:1 transformer routing, and Mic/Line select.
Each analog input contains
a balanced low-level XLR connector and a high-level line input on a 1/4 inch
jack. The Digital section of the A2D includes two level pots to adjust the feed
to the A/D converters, each with a corresponding 20-segment calibrated meter. A
multi-position switch selects the desired sample frequency.
Sync LED will light when an external clock signal is used. Rear panel Analog
connectors include an XLR input and output for each channel, as well as a
balanced 1/4" TRS insert to the A/D converter. This allows the A2D to have
external analog processing devices inserted in the audio chain (EQ, compression,
etc.) Digital interface connectors provided are SPDIF single ended RCA connector
and AES digital out on XLR. A coaxial BNC accepts external "Super Clock" which
will illuminate the front panel EXT SYNC LED when locked. In addition, there are
a pair of 9-pin D-sub connectors which allow the linking of multiple A2D units,
all operating off the first sample-rate clock in the chain.
* A pair of signature 312 mic
preamps * API 2520 op amps * 20 Segment LED metering on both Analog and
Digital sections * Mic and Line inputs * Polarity, Phantom power, Input
pad, 2:1, and Mic/Line switches * 6 sample rate choices * External Super
Clock * Input Multiple A2D units can be slaved together * Insert point
provided between Analog and Digital sections
0API A2D - 2 Mic Preamps und DI mit AD-Wandler
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