Analog Summing Mixer with Floating Differential Bus and Genuine Haufe SSL-Style Transformer Output

This 8-channel analog summing mixer is designed for integrating multiple synthesizers, drum machines, and DAW outputs into a single professional analog mix bus. The unit is built around a passive Floating Differential Bus summing network and a transformer-coupled active output stage.

The active stage incorporates genuine vintage Filtek-Neumann amplifier cards, combined with original German Haufe audio transformers, forming a complete analog output stage based on authentic German broadcast console circuitry.

The fully balanced floating differential bus ensures excellent channel separation, stable stereo imaging, and clean integration with modern professional audio interfaces and converters.

A precision stepped attenuator provides accurate level control with perfect stereo tracking and full recall capability.

Key Features

Floating Differential Bus
Passive fully balanced floating differential summing network with no direct signal ground reference, maintaining low noise and proper channel separation.

Genuine Filtek-Neumann Amplifier
Original vintage Filtek-Neumann amplifier modules used as the active output stage.

Original German Haufe Transformers
Four (4) genuine Haufe audio transformers providing high harmonic content, transformer-coupled output and galvanic isolation in active mode.

Active / Passive Operation
Switch between passive summing output or active transformer-coupled output stage.

21-Step Precision Stepped Attenuator
Provides accurate stereo level control with repeatable recall.

Stereo or Mono Input Mode
Selectable 2 × stereo or 4 × mono configuration for flexible routing of mono sources.

Fully Balanced Signal Path
Compatible with professional converters and audio interfaces.

Dual Independent Stereo Amplifier Stages
Separate amplifier paths for left and right channels reduce crosstalk.

Custom Front Panel Engraving Available

Technical Details

• 8 × Balanced 1/4″ TRS Inputs

• 2 × Balanced 1/4″ TRS Outputs (Stereo L/R)

• Passive Floating Differential Bus Summing Network

• Genuine Filtek-Neumann Amplifier Cards

• Original German Haufe Transformer Output Stage

• Switchable Active / Passive Mode

• 21-Step Precision Stepped Attenuator

• Stereo / Mono Mode Switch

• Fully Balanced Signal Path

• External Linear Power Supply (EU plug)

• Handmade in EU

Custom Shop – Build Your Own

Each VintageMaker unit can be custom built to your requirements. Available options:

• Channel count

• Connector types (DB25 / XLR / TRS)

• Transformer options

• Custom engraving

Contact VintageMaker for custom builds.

Production and Shipping

Build Time: 12 working weekdays after cleared payment
Shipping: Worldwide shipping available

• Build Time: 12 Working Weekdays after cleared payment.

• Shipping: Worldwide shipping available.