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Tiptop Audio Forbidden Planet

$120.00 to $149.00 Price Tier: Budget

1 Critic Review

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Page last updated Jun 30, 2026

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$149.00 $139.00 $10.00 · All time low

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4.0 (2)

$139.00

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5.0 (2)

$120.00 10 available New

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$130.00

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4.8 (20)

$134.00 $133.00 $1.00 · All time low

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$149.00

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Average Price: $127

Budget/Beginner

$149

$350+

Price Tier

In the Modular Synthesizers category, TipTop Audio Forbidden Planet is priced in the Budget/Beginner range. This is great gear to get started with or for creators on a budget.

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High-end

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Based on price data from 4 merchants for "TipTop Audio Forbidden Planet". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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Embark on a sonic journey with the TipTop Audio Forbidden Planet, a multimode filter module inspired by the legendary 1975 Steiner-Parker Synthacon. This Eurorack module is a gateway to a universe of sound-shaping possibilities, offering highpass, bandpass, and lowpass filter modes that can be used individually or in tandem. Whether you're crafting atmospheric soundscapes or sharp, cutting rhythms, this module is designed to elevate your modular synth experience.

The Forbidden Planet stands out with its unique resonance circuit capable of self-oscillation, providing a spectrum of tones from smooth and subtle to aggressive and gritty, depending on your settings. Its highpass mode delivers a sharp, precise cut, ensuring your high frequencies remain crystal clear. The bandpass mode excels at isolating mid-range frequencies, perfect for those moments when you need to zero in on just the right sound. And for those rich, classic analog textures, the lowpass mode offers a satisfying 12dB slope.

Designed with versatility in mind, the Forbidden Planet includes dual CV inputs, one featuring an attenuverter for nuanced control over filter frequency and resonance. This module is not just a tool but an invitation to explore new sound dimensions, making it an essential piece for any modular synth enthusiast.

Key Features:

Multimode filter modeled after the Steiner Parker Synthacon
Highpass, bandpass, and lowpass filter inputs, usable simultaneously
Resonance capable of self-oscillation with saturation
Two CV inputs for filter frequency and resonance control
Power requirement: 10 mA (+12 V) / 10 mA (-12 V)
Eurorack compatible: Width 8HP, Depth 30.5mm
Includes power ribbon cable

Owner's manual

TipTop Audio Forbidden Planet User Manual

Product specs

Type	Filter
Analog/Digital	Analog
Frequency Controls	Cutoff, Resonance
Analog Inputs	3 x 1/8" (highpass, bandpass, lowpass)
Analog Outputs	1 x 1/8"
Other I/O	2 x CV in
Depth	1.20" (30.5mm)
HP Size	8HP
Power Usage	±12V/10mA
Power Supply	Requires Eurorack case and power supply

FAQs

What type of filter is the TipTop Audio Forbidden Planet?: The TipTop Audio Forbidden Planet is an analog multimode filter inspired by the 1975 Steiner-Parker Synthacon design, offering high pass, low pass, and band pass filtering options.
How does the TipTop Audio Forbidden Planet integrate into a Eurorack system?: The Forbidden Planet module requires a Eurorack case and power supply, occupying 8HP space and utilizing ±12V/10mA power.
What control options are available on the TipTop Audio Forbidden Planet?: The Forbidden Planet features manual and CV control over cutoff and resonance, allowing for dynamic sound shaping.
Can the TipTop Audio Forbidden Planet handle multiple input signals?: Yes, it has three 1/8" analog input jacks for high pass, band pass, and low pass signals, enabling versatile filtering capabilities.
What is the output configuration of the TipTop Audio Forbidden Planet?: The module provides a single 1/8" analog output for processed audio, delivering filtered sound to the rest of your modular setup.

Videos

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once upon a synth

Tiptop Audio Forbidden Planet (VC Multimode Analog Filter)

once upon a synth

The Forbidden Planet Multimode Eurorack Filter

Perfect Circuit

Tiptop Audio Forbidden Planet

DominikVogel

Tiptop Audio Forbidden Planet Eurorack Filter Feedback test

Sound Provider / Leonard de Leonard

Tip Top Audio Forbidden Planet Filter Module Demo

Let's Listen

FORBIDDEN PLANET by TIPTOP AUDIO - FULL REVIEW (ENGLISH VERSION)

COLOR MY SOUND

Tiptop Audio Forbidden Planet: Saw and Square Hi-Pass filtering and pinging

Station 252

TipTop Audio Forbidden Planet Introduction

SundayAfternoonModular

Reviews

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PROS

Offers a unique mix of sweet, mellow, and raw, harsh filter sounds
Affordable option for synthesizer enthusiasts
Emulates the classic Steiner Parker Synthacon filter sound
Includes three inputs for versatile signal mixing
Provides smooth, high-quality resonance at elevated levels
Useful as a standalone effect or for processing other devices
Excellent choice for creating wobble effects with Make Noise Maths
Handy as a mixer in tight situations

CONS

Limited to 2 knobs and a few ports, may lack controls for some users

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about TipTop Audio Forbidden Planet.

Comparisons

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The Tiptop Mantis case is highly recommended for its reliable power and manufacturer reputation, contrasting with the unreliable uZeus setup.
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The Forbidden Planet's Bandpass is highlighted for its clarity and usefulness in sound design, setting it apart from other Steiner-Parker inspired filters.
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The Forbidden Planet is described as more "acid," ideal for acid music or sci-fi sounds; it has a rich lowpass, especially with sawtooth waves.
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Features and functionality

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It self-oscillates up to saturation, providing a wide range of resonance from smooth to aggressive.
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This module includes two voltage-controlled inputs, with one featuring an attenuator, allowing more precise control and modulation options.
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The Forbidden Planet's High Pass section is noted for its signature sound, offering a unique tonal character distinct within the module's capabilities.
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Forbidden Planet offers separate inputs for HP/LP/BP filters, making it versatile for mixing different filter types simultaneously.
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The Wasp filter provides a unique resonance and character, akin to an overdriven MS-20 filter, offering a distinctive, "dirty" sound.
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Value and pricing

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The model is priced at $120, which is considered a reasonable cost for an 8HP module with its range of features.
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Mods and upgrades

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Switching to a more robust power system like the Tiptop Studio Bus or Befaco Excalibus can reduce interference issues noted with the Forbidden Planet.
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User experience

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It's noted that the Forbidden Planet can inadvertently capture high-frequency signals from nearby modules, especially when powered by certain setups.
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Some users find the Forbidden Planet more "playable" due to its smooth layout and responsive pots, enhancing manual interaction.
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Use cases and applications

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Some owners use the Forbidden Planet as a dedicated filter ping despite issues, due to its unique sound characteristics.
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The Wasp is favored for its versatility and character; it can range from mellow to intense, making it suitable for diverse sonic exploration.
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Setup and maintenance

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The Forbidden Planet can pick up unwanted noise from oscillators, particularly when using the uZeus power supply with flying bus boards, which are prone to interference.
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Users report scratchy sounds from the Resonance and Frequency knobs, suggesting using isopropyl alcohol and compressed air to clean the pots.
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0 0

The Doepfer Wasp filter is prone to frying a specific chip, but it's a simple fix with socketed ICs requiring no soldering tools.
Source

Critic Reviews

Tiptop Audio Forbidden Planet

soundonsound.com

The TipTop Audio Forbidden Planet filter brings a unique twist to modular setups with its interesting input/output design and solid sound quality. While it excels at producing rich, resonant tones suitable for various electronic applications, its inability to generate low-end kick drums and lack of resonance CV input may frustrate some users. Despite these drawbacks, its affordability and ability to mix filter types set it apart, making it a worthy addition for those seeking creativity in sound design.

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