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like a Tube Amp
the 5500 has a 1/4 inch input connector that interrupts any present signal on the input XLR
and the high pass filter has a range from 20 Hz to 600 Hz
had some inherent flaws
including the 512c Mic Preamplifier
API 550A Discrete 500-Series 3-Band Equalizer Pre-Owned New Arrivals like a Tube AmpForty 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
