DN 300 Graphic Equalizer DN 301 Attenuating equaliser DN 320 Preset Equalizer DN 330 Equaliser DN 360 Graphic Equaliser DN 405 Parametric Equaliser DN 410 Parametric Equaliser DN 500 Dual Compressor/Limiter/Expander DN 60 Spectrum Analyser DN 7204 Programmable Delay Line with Equalisation RT 60 Spectrum Analyser