Balanced XLR Source Selector BBM Switch 4×4 | Passive Audiophile Audio Router

• Product Description

  Passive Balanced XLR Source Selector – Break-Before-Make Architecture

  A custom-built passive balanced audio routing system designed for audiophile and professional Hi-Fi applications where signal purity is paramount.

  The unit enables safe Break-Before-Make (BBM) switching between multiple balanced audio sources while preserving maximum signal integrity. No relays, power supply, or active circuitry are present in the audio path.

  Ideal for comparing DACs, analog front ends, and tube stages without introducing additional electronics into the signal chain.

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  Typical System Configuration – Signal Flow – see switch diagram – designed by customer – Zack Benjamin

  Sources

  • RME ADI-2 DAC FS
  • FiiO DAC
  • Pro-Ject Turntable (via balanced phono stage)

  Downstream Equipment

  • Cayin HA-6A MK2 Tube Amplifier
  • Rega Osiris Integrated Amplifier

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  Signal Routing

  Input Selection

  Select one of three balanced audio sources and route it to two independent signal paths:

  Path A

  • Tube amplification stage
  • Cayin HA-6A MK2

  Path B

  • Direct balanced bypass path
  • Rega Osiris input

  This configuration allows immediate comparison between tube-enhanced playback and the original balanced signal.

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  Key Features

  • True passive signal routing
  • Break-Before-Make (BBM) switching
  • No relays or active electronics
  • No power supply required
  • Gold-plated switch contacts
  • Fully balanced XLR signal path
  • Excellent common-mode noise rejection
  • Ultra-low insertion loss
  • Transparent bypass operation
  • Instant A/B comparison capability
  • Hand-built studio-grade construction

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  Applications

  • DAC comparison systems
  • High-end Hi-Fi installations
  • Tube vs direct signal evaluation
  • Balanced analog source selection
  • Audiophile listening rooms
  • Mastering and reference monitoring chains

  Extra-Wide Desktop Enclosure: Width 200 mm × Height 60 mm × Depth 100 mm

• *7.87 × 2.36 × 3.94 inches (W × H × D)

Applications

• Studio Monitor Control
• Mixing Workstations
• Mastering Studios
• Audio Interface Switching
• Multiple Monitor Speaker Selection
• Source Comparison and Reference Monitoring

Custom Name Engraving and select knob style (let me know)

You can get as many channels and options as you want, so let’s build your gear!

Build time: 10 Working Weekdays after cleared payment

Do not find your controller or switcher? Tell me what you need and I build for you!