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 A Series EQ by URS is a Virtual Effect Audio Plugin. It functions as a VST Plugin, an Audio Units Plugin and an RTAS Plugin.
A Series EQ
Product A Series EQ
Developer URS
Price (MSRP)
$249.99 (Bundle)
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
Downloads Released
Downloads Released
Miscellaneous Information
Copy ProtectionDongle (PACE iLok Smart Key)

The A Series EQ digitally recreates the sound of API's 550B vintage Four Band Equalizer. Each band offers 7 switchable filter frequencies spanning 4 to 5 octaves. The four bands overlap for track sweetening or specific problem solving. The low and high bands are selectable peak or shelving.


  • Number of Bands: Four.
  • Low and High bands are Peak/Shelf switchable.
  • Low-Mid and Mid-High are peaking type.
  • Filter Frequency Centers:
    • Low: 30, 40, 50, 100, 200, 300, 400Hz.
    • Low-Mid: 75, 150, 180, 240, 500, 700, 1Khz.
    • Mid-High: 800, 1.5K, 3K, 5K, 8K, 10K, 12.5K.
    • High: 2.5K, 5K, 7K, 10K, 12.5K, 15K, 20K.
  • Filter Boost/Cut: +/- 12dB variable to.1db.
  • Filter Slope: 12dB per Octave.
  • Seven selectable frequencies per Band.
  • Gain clipping indicator.
  • Phase reverse switch.
  • In / Out Bypass switch.
  • Numeric Windows for click on entry.
  • Plasma Style Input and Output VU Meters.
  • Input Line Trim -12db to +4db variable to.1db.
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