besides two active Ripol woofers 30-40 Hz. Each with two Gladen RS 15 A. Amplifier for the Ripol woofers is a Crown XLS 1502, 2*775 Watt into 2 Ohms. The Gladen with 4 Ohm are in parallel.
The Linea Research ASC 48 FIR digital speaker management system was modified with OPA 1612 ultralow noise, ultralow distortion, high slew rate operational amplifiers. foobar / Topping D70S DAC as source.
Audio Track: Alexandre Prodhomme & Eddy Pradelles "Pressure"

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