Heritage Audio OST-6

A New Generation of Heritage Audio Chassis Designed for Compatibility

With the OST-6, Heritage Audio continues developing its new range of Series 500 enclosures by focusing on a often underestimated studio aspect: power supply quality. In an ecosystem where hundreds of module manufacturers coexist (preamps, equalizers, compressors, saturations, routing tools), electrical stability is not a detail: it determines the reliability, noise level, and behavior of modules over time. The OST-6 adopts a more "pro studio" approach to power distribution to secure the hybrid and evolving configurations typical of the 500 format.

A 6-Slot Chassis for Studios, Home Studios, and Mobile Setups

The OST-6 is aimed at those who want to build a customized processing chain in the 500 format without the bulk of a large chassis. Its 6 slots make it an ideal format for a high-end recording chain (preamp + EQ + compressor), a small mixing control room (EQ and stereo dynamics), or a rack of creative processing. Thanks to its handle and rubber feet, it is also well suited for mobile setups: capturing, recording sessions, or project studios that need to move and reconfigure quickly.

Need integration in a 19-inch rack? The included rack ears are custom designed and their smart design allows for assembly/disassembly in seconds, convenient for switching from desktop use to rack mounting depending on location, session, or studio evolution.

OTS "On Slot": Isolation Per Slot, Diagnostic Indicators, and Sized Power Supply

Dedicated Linear Regulation: Each Module "Lives" on Its Slot

The ON SLOT (OTS) technology relies on state-of-the-art power electronics to manage power supply per slot. Concretely, each slot has its own linear regulation stages: modules are thus isolated from the rest of the chassis and do not share a common regulation, which helps reduce issues sometimes encountered when several very different modules coexist (variable consumption, startup behavior, sensitivity to power supply noise). Modules share the metal enclosure, but the idea is to professionalize power distribution for greater peace of mind daily.

Slot Test Indicators: Instant Control

Each slot includes test indicators located next to the slot connector: red for +16 V and green for -16 V. This detail is a game changer for maintenance and integration: you can quickly visualize the proper state of the power rails, slot by slot, when installing a new module, diagnosing, or changing configuration.

Available Current and Phantom Power: A Solid Base for Demanding Modules

Thanks to OTS, the OST-6 offers a power capacity of up to 400 mA per rail per slot, with a total maximum of 1.6 A per rail (up to 1.8 A non-continuous), depending on which limit is reached first. Phantom power is also provided with a maximum of 140 mA total, useful for modules that require it. The unit operates on a universal voltage 100-240 VAC, adapting to most studio environments and mobile setups.

Regarding construction, the chassis features a RAF Blue Grey finish with a thick steel enclosure and an aluminum front panel, for robust integration in studios or racks and good mechanical durability during repeated handling.

Technical specifications

Category	format 500	Rack unit	3
Number of channels	6	Analog outputs	XLR
Valve	No	Color	Grey

Number of slots	up to 6 modules	Test indicators per slot	red for +16 V, green for -16 V
Use	standalone unit with handle and rubber feet	Maximum audio current	1.6 A per rail or 400 mA per rail per slot (whichever limit is reached first)
Rack mounting	ears included	Audio current	up to 1.8 A non-continuous (per rail)
Assembly/disassembly of ears	in seconds	Maximum phantom power current	140 mA
Technology	"ON SLOT" (OTS)	Operating voltage	100-240 VAC
Power management	per slot	Enclosure	thick steel
Regulation	dedicated linear regulation stages per slot	Front panel	aluminum