Modeled after API's highly prized console-based 325 booster cards, the 535 can both amplify and attenuate incoming and outgoing signals for ultimate flexibility—all while providing API's trademark warmth and tone.
The 535 excels at adding warmth to a variety of signals. Recommended uses include:
•Warm up digital signals of all kinds
•Add Tone to Keyboard rigs
•Add warmth to any mix
Features
•Continuously variable detented input level trim
•Polarity button
•20dB Input Pad
•Calibrated Level mode
•Output Ratio selector
•Clip LED indicator
•Continuously variable Output Gain
•Traditional API fully discrete circuit design
•Audio circuit uses the famous 2510 and 2520 Op-Amps
•Traditional API fully discrete circuit design.
Frequency Response:-0, +0.2, 30Hz-20kHz
THD+N:.006% at factory CAL Level setting (+4dBu)
Noise floor:-85dBu at factory CAL Level setting
Gain Range:-inf. to 53dB
Maximum Input level:+32 dBu, balanced (with PAD)
Maximum Output level:+32 dBu MAX, balanced (1kHz)
Input Impedance:Greater than 20,000 ohms, ~4,000 ohms w/ pad
Output Impedance:Less than 75 ohms
API 535 User Guide
