Behringer Modamp Module 1005
At 16 HP and under 500 grams, it slips into a Eurorack case like a secret weapon for sonic disintegration.
Overview
The Behringer Modamp Module 1005 is a Eurorack-format module designed as an authentic reproduction of the original “System 2500” circuitry from the 1970s. Marketed as both a ring modulator and a voltage-controlled amplifier (VCA), it brings a dual-purpose design to modern modular setups. It fits seamlessly into standard Eurorack cases, making it accessible for both newcomers and seasoned builders looking to expand their sonic palette with vintage-style processing. While compact in size and current draw, the module is built around a discrete balanced modulator circuit, echoing the architecture of its analog predecessor.
Despite its modest footprint, the Module 1005 packs nine patch points, allowing for flexible signal routing and modulation possibilities. It operates on standard Eurorack power rails, drawing 60 mA from the +12 V supply and 45 mA from the -12 V rail, with no load on the +5 V line. The module functions within a standard operating temperature range of 5° C to 40° C (41° F to 104° F), suitable for typical studio environments. Input impedance is rated at 50 kΩ (unbalanced), with a maximum input level of +12 V and a minimum switching threshold of +4 V—specs that suggest robust handling of control and audio signals alike.
However, user experience reveals a notable quirk: one forum report indicates that "the carrier’s audio comes through no matter what," suggesting potential limitations in carrier suppression during ring modulation. This behavior may be intentional, a result of the faithful circuit replication, or an artifact of component tolerances in the reproduction. Whether this is a flaw or a feature depends on the user’s intent—some may welcome the bleed as character, while others expect complete carrier nulling typical of ideal ring modulators.
Specifications
| Manufacturer | Behringer |
| Model | Modamp Module 1005 |
| Type | Eurorack Module |
| Width | 16 HP |
| Depth | 43 mm |
| Current consumption | 60 mA (+12 V) / 45 mA (-12 V) |
| Standard operating temperature | 5° C to 40° C (41° F to 104° F) |
| Inputs | 2 Signal inputs with level control |
| Input Impedance | 50 kΩ, unbalanced |
| Max input level | +12 V |
| Minimum switching threshold | +4 V |
| CV in | 1 x 3.5 mm TS jack, DC coupled |
| Features | MOD and UNMOD mode for use as ring modulator or VCA |
| Features | Integrated VCA with gain control and switch between linear and exponential control characteristics |
Key Features
Authentic reproduction of the original “System 2500” circuitry from the 70's
Behringer positions the Module 1005 as a faithful re-creation of the analog circuitry found in the 1970s-era System 2500. This lineage is central to its appeal, targeting users who want vintage-style ring modulation without sourcing rare or expensive original hardware. The use of discrete components in the balanced modulator stage suggests an effort to preserve the sonic character associated with that era, though no detailed documentation confirms component-level accuracy or layout fidelity.
MOD and UNMOD mode for use as ring modulator or VCA
The dual functionality is a key design element. In MOD mode, the module performs ring modulation—multiplying two audio signals to produce sum and difference frequencies, creating metallic, bell-like, or inharmonic textures. Switching to UNMOD mode repurposes the circuit as a VCA, with the "UNMOD gain control" allowing manual adjustment of output level. This flexibility makes the module more than a one-trick effect, offering dynamic amplitude control alongside its more experimental modulation role.
Integrated VCA with gain control and switch between linear and exponential control characteristics
The VCA section includes a toggle to select between linear and exponential response curves, a critical detail for how the module handles control voltage dynamics. Exponential is typically preferred for pitch-like response in audio-level amplitude shaping, while linear suits precise, proportional control such as in envelope following or modulation depth scaling. The inclusion of this switch adds versatility, allowing users to match the response to their patch context without needing an external VCA.
Collectibility & Value
New units are available at retail prices around $37 (Thomann), £33 (Gearnews), or CHF 66.60 (MusiX), suggesting it is a budget-conscious addition to a Eurorack system. No secondary market data or collector premiums are documented, and The reported issue with carrier bleed may affect performance expectations, but no widespread failure patterns or maintenance concerns have been recorded.
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