Doepfer A-103 18dB Low Pass Filter
Professional music gear - detailed information and where to buy
Doepfer
A-103 18dB Low Pass Filter
Product Info
Article Number:
199307
Brand:
Doepfer
Model:
A-103 18dB Low Pass Filter
Category:
Filter Modules
Price:
$97.90
* Prices may vary. Check retailer for current pricing and availability.
This A-103 is a no-brainer if you’re chasing that iconic TB-303 acid sound. It's a compact, reliable workhorse that brings a distinct, warm character to your modular patches—perfect for techno, house, and experimental sound design. It’s an essential module for recreating classic sounds or forging your own sonic territory.
Product Description
- Doepfer A-103 18DB Low-Pass Filter
- 18 dB Low-Pass Filter for A 100 Modular System
- Voltage-controlled low-pass filter with an 18 dB / octave slope
- The circuit is based on a modified transistor ladder (Moog ladder)
- and corresponds to the low-pass filter of the TB303
- Width: 8 HP / 40.3 mm
- Depth: 55 mm (measured from the rear side of the front panel)
- Power requirement: +30 mA (+12 V) / -10 mA (-12 V)
PROS
- • Classic TB-303 filter character, instantly recognizable and usable
- • Transistor ladder design delivers a warm, resonant low-end
- • Compact 8HP footprint, ideal for space-constrained modular systems
- • Solid Doepfer build quality; reliable and durable for years.
CONS
- • Limited resonance control compared to more modern filter designs
- • Power draw is a bit higher than some other Eurorack modules
- • The 18dB slope can be aggressive; not always subtle.
Product Video
Key Features
Filter Type
18dB Low-Pass
Modes
Single Mode
HP Width
8
Depth
55 mm
Power Draw
+30 mA / -10 mA
CV Inputs
One CV input for cutoff frequency control
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Frequently Asked Questions
The resonance is more modest than later designs, providing a less extreme self-oscillation, but still contributing to the classic TB-303 sound.
Absolutely, it's a very accessible filter with a distinct sound, but understanding CV control is helpful to fully utilize it.
There’s a subtle but definite difference; the hardware has a certain warmth and analog character that’s difficult to perfectly replicate digitally.
