We’re looking at a complete DEQX system; DEQX HDP-5 preamplifier/digital linear phase crossover/frequency & group calibration and room compensation/Roon certified end point, DEQX A250x3 monoblock 3 channel amplifier, DEQX/Legen Acoustics ISR active monitors ($16995/system). Frequency response is a reported 100Hz – 10kHz (+/- 0.5dB anechoic).