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Manley Backbone DB25 I/O Version – No Longer Available

The mastering engineer's dream come true, allowing precise control of up to eight pieces of outboard gear

Product Description

The Manley Laboratories Backbone Mastering Insert Switcher is built with a unique electronic topology that maintains a fully balanced signal path through 95% of the console. All other designs require the balanced signals to be converted to unbalanced before sections that, for example, allow you to boost or cut level, then inversely need to be converted back to balanced to feed the outside world. In other words, this new topology not only does it in one stage rather than 3 or 4, but also does it as cleanly and quietly as any single stage that we know of, including fully discrete approaches. This topology also provides better common mode rejection and power supply rejection than conventional approaches. This is significant especially in the “Sum-Difference” functions.

Each of the 10 gain blocks and all of the switches are on connectors, which means, if the need ever arises for service, it can likely be done quickly without the need for a technician or soldering iron – just a medium-small Philips screwdriver. No expense was spared in the quality of the parts, so one should expect many years of continuous professional use.

Please note that this is not a “Monitor Control Box.” It is simply a device that helps route various analog processors with maximum fidelity or allows you to maintain the shortest possible signal path while providing some flexible central control functions. This unit is not supposed to color your sound in the least; it just exists to let you use your favorite outboard gear in more creative ways.


  • Three inputs
  • Eight inserts
  • Balanced signal path all the way
  • Left - right reverse
  • Absolute polarity reverse
  • Bypass gains makes passive signal path
  • Over 90 nice relays
  • EAO switch buttons that you can easily custom label
  • 4 x 24 position Grayhill switch attenuators for input and output gains
  • MID - SIDE (MS Matrix) for Inserts 2 & 3
  • Swap order button for inserts 4 & 5
  • Mix - fade injection between 7 & 8
  • Expensive Penny & Giles rotary fader/mixer
  • Available with ELCO or DB25 I/O connection system
  • Bulletproof MANLEY build quality. But of course!

Product Specifications

Condition New
Tube or Solid State Solid State
Chassis 19-inch Rack-mount
Rack Spaces 2u
Digital I/O No
Input Connectors Analog DB25, Analog XLR
Output Connectors Analog DB25, Analog XLR

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.