A-103 18dB Low Pass Filter

Doepfer A-103 18dB Low Pass Filter

The Doepfer A-103 is a 3-pole (18dB/octave) analog low-pass filter based on the iconic TB-303 circuit. This filter delivers the unmistakable acid squelch and aggressive resonance that defined early techno and acid house. It brings a sharp, liquid tone with a unique slope and self-oscillating capabilities.

The A-103 includes CV control for cutoff frequency, making it easy to modulate in real time. It's a great addition for anyone chasing classic Roland-inspired filter behavior in a modern modular system.

Key Features:

• Based on the Roland TB-303 filter design

• 18dB/octave low-pass (3-pole) response

• Classic acid-style resonance

• Self-oscillating capabilities

• CV input for cutoff frequency control

• Great for acid, techno, and classic electronic tones