Heritage Audio OST-4

4-slot Powered Rack for 500 Series Modules with Per-slot Power Regulation, 700mA Total Power Capacity, 80mA Total Phantom Power, and XLR I/O
Heritage Audio OST-4 image 1
Heritage Audio OST-4 image 1

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Heritage Audio OST-4
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Reliable Power for up to Four 500 Series Modules

If you're planning on using multiple 500 series modules in your studio or live rig, this Heritage Audio OST-4 4-slot rack with On Slot Technology is the smart way to house them. On Slot Technology simply means power is distributed on a per-slot basis - each slot has its own power supply linear regulator stages, which isolate each slot from the others and ensure each stays within the proper operating range. Recording engineers at Sweetwater know that power can be a concern when combining multiple 500 series modules from different manufacturers. You'll be able to mix and match 500 series modules with confidence with the Heritage Audio OST-4 500 series rack.

Heritage Audio OST-4 500 Series Rack at a Glance:
  • Protects your 500 series modules against power problems
  • Linear regulators ensure stable, precise power
  • Ample power for a 4-space rack
Protects your 500 series modules against power problems

Each slot in the OST-4 rack is completely isolated from the others, to ensure that the behavior of one power-hungry module doesn't affect the operation of the others. Over-current protection ensures that a sudden power draw won't fry your favorite mic preamp, while thermal protection for each slot protects modules against overheating. Unlike some 500 series racks that share electrical current across all slots, the Heritage Audio OST-4 rack ensures each module gets the exact power it needs, independent of the other modules.

Linear regulators ensure stable, precise power

The Heritage Audio OST-4 uses linear power regulators on each slot that are extremely precise, and this ensures power stability no matter what modules you're using. Voltages stay at +/-16 volts with an impressively low variance of only +/-0.1 volts. Each slot has red and green LEDs so you can easily check the power status for any module.

Ample power for a 4-space rack

With On Slot Technology, the OST-4 can provide 400mA per slot, or up to 700mA total across all slots (whichever is reached first). A total of 80mA of power is available for phantom power.

Heritage Audio OST-4 500 Series Rack Features:
  • 4-slot powered rack for 500 series modules
  • On Slot Technology regulates power to each slot individually, isolating each slot
  • Power capacity of 400mA per slot or up to 700mA across all slots, whichever is reached first
  • Phantom power available: 80mA total
  • Provides peace of mind when mixing modules with different power requirements from different manufacturers
  • Over-current and thermal protection for each slot
  • Audio inputs and outputs on gold plated XLR connectors
Power your 500 series modules with the Heritage Audio OST-4!

Additional Media

500 Series Buying Guide

Tech Specs

Number of Slots 4
Manufacturer Part Number OST4

Customer Reviews

Based on 3 reviews
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I toyed with the idea of owning a lunchbox for some time and finally pulled the trigger on this guy. It's perfect and simple and its small enough to fit on a crowded desk. Perfect for a first lunchbox. Did I really need 8 slots to fill to start out with? Nope. I have everything I need for years here and it's good clean power. I want just a few really special modules so this is perfect for me. And it fits in my small space as the power supply is separate and doesn't take up much room on a desk. Gold plated Neutrik connectors as well.

excellent all around

This little guy is awesome. very sturdy, and straight to the point. The only downsides of this unit that I can think of are no power switch, and it would be cool to have trs outs on the back. I knew it didn't have these features when I purchased it, so it isn't a disappointment at all. For the price its unbeatable.


300 bucks, Solid, compact but powerful, very cool green lights....... you can't beat this deal........ used it with Neve 1073LB and TG2 500.
Music background: Pop, gospel
See also: Heritage Audio, Heritage Audio 500 Series Chassis