API 550A Discrete 500-Series 3-Band Equalizer Computer Audio and played back again for

and played back again for further editing by the user

The paper cone

or "pinging" caused by false triggering

state-of-the-art pin termination

API 550A Discrete 500-Series 3-Band Equalizer Computer Audio and played back again forForty years later, the 550A remains the standard against which other EQs are measured, and it has played a major role in the recording industry for decades. Still copied but never duplicated, the 550A became API's standard channel module EQ when the company began manufacturing consoles in 1971. With virtually all existing units spoken for, popular demand for this EQ resulted in API finally resuming production in 2004. The 550A provides reciprocal