API / 550b

This is a 4-band equalizer module from API. Each band can be boosted or cut by up to 12dB. It utilizes API's traditional fully discrete circuit design.

[直輸入品][Direct Import]

■ 4-Band Equalizer Module

■ A 4-band version of the most popular 550A

■ Equipped with a 7-point center frequency selector switch for each band

■ Interoperable and continuously controllable filter function

■ Boost/cut up to 12dB for each band

■ Range control with ""Proportional Q"" circuit

■ API's traditional fully discrete circuit design

■ High headroom with a clipping level of 30dB

The 550EQ played a significant role in much of the history of American recording from the 1960s to the 1970s.

Originally conceived for use with API consoles, this latest 550 ""B"" version inherits the potential of the ""550"" developed in 1967 and the subsequent ""550A,"" while adding an extra band for wider frequency control.

Incorporating API's discrete circuitry and original components (API 2520 op-amp), the 550B fuses past and present technology.

While many modern equalizers tend to be complex, the 550B offers engineers simple functionality found only on the control panel.

In other words, because it only has carefully selected functions, every single one is beneficial to the engineer.

The 550B's effectively divided 4-band control is powerful for troubleshooting various issues and audio sweetening.

Each band has a 7-point frequency selector switch, with a range of 4-5 octaves.

This specification was determined after rigorous research based on the opinions of many renowned engineers.

Of course, the underlying design faithfully reflects the blueprints and specifications of the original model.

By following the ""proportional Q"" design proposed by API in the 1960s, the 550B allows for control of a wide frequency range with only a few settings.

This eliminates the need for a bandwidth parameter.

This feature minimizes phase shift, a common problem with many equalizers.

Thanks to this simple operation, the 550B makes it easy for users to return to their original settings. The advantages of the 550B are clear to engineers who actively use equalizers.

Whether for effective use or for correction, the 550B's performance is exactly what engineers need.

When significant tone control is required, the ample headroom provided by the original 2520 op-amp allows for sound shaping that fully utilizes the advantages of analog processing.