API Audio Accessories 7-22-10, Руководство оператора

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h. 550L Discrete 4-Band Equalizer
The benefits of the API 550L are most obvious to those who work with EQ on a continuous basis.
The 550L's ability to affect or reverse tonal modifications is perhaps the most important feature.
If major tonal restructuring is required, the extraordinary headroom made possible with API's
2520 op-amp offers predictable and gentle "analog" performance under duress. With a
surprisingly wide range of tonal variations, you can do no better than the API 550L.
NOTE: The 550L Equalizer is the same as the 550B except it is configured to work as a
console EQ. The information above is from the 550B Information Page.
Features
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4 bands of our famous sounding equalization
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Each band offers 7 API selected frequency centers
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Reciprocal and repeatable filtering
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12 dB of boost/cut per band
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The High and Low EQ Bands offer shelf/peak switching
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"Proportional Q" narrows filter Q at extremes
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Traditional API fully discrete circuit design
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High he30 dB clip level
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Re-issue of 1967 API 550 EQ with an extra band
The API 550 EQ played a major part in the history of music recording in
the USA during the 60's and 70's. Originally conceived for use in API's
consoles, this latest 550 "L" version is a continuation of the original
1967 550 through the 550A with one additional filter band and several
new frequencies. Incorporating API's exclusive circuitry and proprietary
components (such as the legendary API 2520 op-amp), the 550L
artfully blends the past with the present. So many hit records still
depend on the unique 550 sound, that the 550L will be an invaluable
tool you will turn to again and again. The API 550L—unlike any other
you will ever use.
Many EQ's today offer a huge assortment of complex features, but the
API 550L provides exactly the right number of controls to the
professional engineer. Deceptively simple at first glance, the 550L's
four EQ bands are overlapped significantly to aid in dual roles as
problem solver and sweetening device. Each band offers 7 switchable
filter frequencies spanning 4 to 5 octaves, selected through experience
by a "who's who" list of the industry's most proficient engineers. This
re-issue design has been taken from the original blue prints and spec
control drawings from the API archives.
Making use of "API Proportional-Q", a design introduced by API in the
60's, the 550L intuitively widens the filter bandwidth at minimal settings
and narrows it at higher settings—without the need for additional
bandwidth controls. This feature minimizes the "phase-shift" sound
found in many equalizers. The reciprocal nature of the 550L enables the
user to "undo" what has been done previously.