API Audio 550A 50th Anniversary Edition

$2,000.00

Enter your email address to be notified when this item is in stock.

New Item, Stock On Order For Arrival Soon

Stock Item: Ships from our shelf quickly in almost all cases when ordered before our ship cutoff times.

Direct Ship: Non-stock item, but normally ships quickly from the manufacturer or alternate warehouse.

Built To Order: Item is custom built per the options chosen and quickly shipped out upon completion.

More On The Way: The manufacturer is experiencing delays, but we'll ship quickly upon arrival.

New Item: We have this on order, the manufacturer hasn't shipped but you'll be in line upon arrival.

Visit our Shipping Page for cutoff times for FREE (USA), UPS, USPS or FedEx.

Visit our Returns Page for info on non-returnable, special order non-stock items.


API brings back a classic in the modern day, don't miss out on this limited run equalizer for 500 series!

The API 550A 50th Anniversary Edition is a discrete 3 band EQ and a reproduction of the original Saul Walker design from the early 1970s. For nearly 50 years the 550A has played a major role in the recording industry and remains the standard by which other EQs are measured. These special limited edition units are painstakingly hand assembled and wired, and feature an exact reproduction of Walker's original printed circuit board. Each unit is a true work of art, inside and out, and represents a piece of recording history. Every Anniversary Edition 550A carries an individual serial number denoting its status as part of a limited run of 100 units.

The 550A provides reciprocal equalization at 21 points in 5 steps of boost to a maximum of 12dB of gain at each point. The fifteen equalization points are divided into three overlapping ranges. The high and low frequency ranges are individually selectable as either peaking or shelving, and a band-pass filter may be inserted independently of all other selected equalization settings. Frequency ranges and boost/cut are selected by three dual-concentric switches, and a pushbutton "in" switch allows the EQ to be silently introduced to the signal path. A small toggle switch is used to insert the band-pass filter into the 550A. The combination of Walker's incomparable 2520 op amp and his "Proportional Q" circuitry gives the 550A user an uncomplicated way to generate acoustically superior equalization.

Features

  • Hand-wired Limited Edition model with 50th Anniversary Faceplate
  • Reproduction of the legendary 1971 550A
  • 3 bands of classic API equalization
  • 5 selectable frequency centers on each band
  • High and Low bands offer shelf/peak switching
  • "Proportional Q" narrows filter Q at extremes
  • Switchable band pass filter
  • Individually Serialized (1-100)

Specifications

  • Maximum Output Level: +30 dBu
  • Output Impedance: Less than 75 Ohms, Transformer Balanced
  • Frequency Response: +/-0.5 dB, 20 Hz to 50 kHz
  • Signal to Noise Ratio: 110 dB
  • Controls:
    • Dual Concentric Rotary: LF select: 50, 100, 200, 300, 400 Hz and stepped boost/cut -12dB to +12dB
    • Dual Concentric Rotary: MF select: .4, .8, 1.5, 3, 5 kHz and stepped boost/cut -12dB to +12dB
    • Dual Concentric Rotary: HF select: 5, 7, 10, 12.5, 15 kHz and stepped boost/cut -12dB to +12dB
  • Connections: API VPR 500 Edge Connector
  • Size: 1.5" x 5.25" x 7" Deep
  • Weight: 2.1 lbs.
Our ONE WITH EVERYTHING ZEN WARRANTY extends the standard manufacturer warranty by one year, see our ZEN WARRANTY page for details.

Recently Viewed Items