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A ten-band inductor-based graphic EQ – Designed to work in standard 500 series racks.
Chandler Limited Little Devil Equalizer
EQ Module with Treble and Bass Shelf, Hi- and Lo-mid 7-selection "Q" Switching, and 3-position Filter, for the 500-Series Rack
Crane Song Insignia Equalizer
500 Series Tube EQ with Dual-triode Circuit, High/Low Shelving, and Lowpass Filters.
BAE G10 500 Series Graphic EQ
500 Series 10-band Graphic EQ with Transformer-balanced Signal Path, Highpass and Lowpass Filters, and 2520 Style Op-amp
Trident 80B 500 Series – 4 Band Equalizer
Four Band 500 Series Eq, Selectable Hi Freq 8/12K 2 Sweepable Mid Bands 1 to 15K and 100 to 1.5K, Selectable Lo Freq 60/120Hz, 50Hz Hi Pass Switch, Peak Overload LED & a Bypass Switch.
SSL 611EQ 500 Series 4 Band EQ
E-Series 500 Format EQ Module
API 550B Discrete 4 Band EQ
Features Four bands, Reciprocal and repeatable filtering, 12 dB of boost/cut per band, EQ band 1 and 4 offer shelf/peak switching, fully discrete circuit design, High headroom +30 dB clip level.
Purple Audio Lilpeqr Program EQ
500 Series EQ Module from Purple
API 550A Discrete 3 Band EQ
3 bands of classic API equalization, Reciprocal & repeatable filtering, Maximum 12 dB of boost/cut per band, shelf/peak switching, fully discrete circuit design, High headroom +30 dB clip level.
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