API Audio 550A 50th anniversary

Discontinued, this product can no longer be ordered.

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API Audio 550A Discrete 3-band EQ in Lunch Box Format

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API Audio 550A 50th anniversary
Product no: 9000-0049-5879 Bax Music Warranty: This product comes with a 3-year warranty.

General

API Audio's anniversaries are traditionally celebrated with special edition releases of their most renowned studio units. The 550A 50th Anniversary is a superior 3-band equalizer with the famed proportional Q on-board, meaning the band becomes less wide the more you cut or boost. The HF and the LF bands can be switched from bell to shelf, while bandpass slightly rounds off the frequency spectrum below 50 Hz and above 15 kHz. Just like all other API units, the 550A is known for its punchy character, delivered by its 2520 OP-Amp. Be quick if you want to claim one for yourself, only 50 units were produced of this limited edition EQ.

Specifications

Product features

Number of 500 series units	1
Mono or stereo	mono
Module type	equalizer
Equipped with tube	no

Weight and dimensions including packaging

Weight (incl. packaging)	2,0 kg
Dimensions (incl. packaging)	27,0 x 19,6 x 12,1 cm

Product specifications

API Audio 550A 50th anniversary
3-band equalizer
API-500 format
uses API 2520 Op-Amp
input impedance: 66 kOhms (high level in), 17 kOhms (low level in)
output impedance: <85 Ohms (transformer isolated)
nominal operating level: -15dBm to +12dBm
insertion loss: none
frequency response without equalization: 30 Hz to 20 kHz
noise: without equalisation, output noise of -90 dBm (high level strapping), -98 dBm (low level strapping), 20 Hz to 20 kHz unweighed
distortion: 0.05% THD max, 30 Hz to 20 kHz @ +4 dBm, 0.07% THD, 30 Hz to 20 kHz @ +18 dBm
clipping levels (3% THD): + 30dBm
controls:
- LF double potmeter: 50, 100, 200, 300, 400 Hz at -12dB to +12dB
- MF double potmeter: 400, 800, 1500, 3000, 5000 Hz at -12dB to +12dB
- HF double potmeter: 5000, 7000, 10.000, 12.500, 15.000 Hz at -12dB to +12dB
- equalisation in increments of 2, 4, 6, 9 or 12 dB (boost and cut)
- toggle switch: 50 Hz to 15 kHz band pass filter (-3dB at 50 Hz and 15 kHz)
- push buttons: LF peak or shelving, HF peak or shelving, EQ in
Dimensions: 38.10 x 133.35 x 196.85 mm
weight: 910 g