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The Sound Devices 633 is designed for production audio mixing and recording on set and in the field. The unit is housed in a compact, lightweight molded metalized carbon-fiber chassis and features six analog inputs: three XLR microphone preamplifier inputs with selectable phantom power, high-pass filters, input limiters, faders and variable pans, as well as three line-level TA3 (mini-XLR) inputs.
All the unit's inputs can be assigned to the mixer's six output buses: left, right, Aux 1, Aux 2, Aux 3, and Aux 4.
The device can record to an SD card, CompactFlash card, or both memory card formats simultaneously in mono or poly WAV or MP3 file formats. The cards can be set to record redundant backups or combinations of WAV and time-coded MP3s for dailies and transcription purposes. The six inputs, output bus left, output bus right, aux 1, and aux 2, can all be recorded to individual tracks at 24-bit 48 kHz resolution for a total of ten tracks.
The device can be powered by any of four different simultaneously coexistent power sources, including 12-18V DC from an external power source, two removable 7.2V L-type lithium-ion batteries, and six internal AA batteries. The unit's LCD display indicates battery levels for the various sources. When one power supply is depleted, the mixer will automatically switch to the next power supply without interruption. When all power supplies are depleted, the device's built-in PowerSafe trickle-charge battery will keep the device running for an additional 10 seconds so that all files can be saved and closed properly and ensure that no data is lost. The built-in battery also allows the device to power up and start recording in two seconds for near-immediate operation. Never wait on sound!
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