Essential Information About the Heritage Audio OST-4 V2.0 Series 500 Chassis
- On Slot Technology: individual power supply and regulation per slot for maximum isolation between modules.
- More stable performance: no "power-hungry" (or faulty) module degrades the operation of others.
- Reduced noise and interference: many Series 500 modules (notably mic preamps) can exhibit lower self-noise once installed in the OST-4 V2.0.
- Designed for the modern studio: universal mains power supply 100-240 VAC and current reserve sized for demanding configurations.
An Evolution Designed to Get the Best Out of Series 500
The Heritage Audio
OST-4 V2.0 follows the brand's "On Slot Technology" philosophy: rather than powering all slots in parallel with a relatively simple common power supply (as is often the case with many Series 500 chassis), each slot here has its
own power supply,
individually regulated and
isolated from the rest. The goal is clear: to provide each module with a cleaner and more stable electrical environment so it can perform at its best, independently of what happens on the other slots.
In this logic, the
V2.0 version emphasizes reliability and consistent operation under real-world conditions: when a rack hosts modules of very different types (preamps, EQs, compressors, saturators, routing tools), current demands and noise sensitivity vary. The OST-4 V2.0 is designed so the chassis remains a
neutral and high-performance platform, rather than a limiting factor.
Who Benefits and In What Applications the OST-4 V2.0 Makes a Difference
This chassis is aimed at sound engineers, producers, and studios working with
Series 500 format modules who want a compact
4-slot rack without compromise on power supply. It is particularly relevant if you use modules known to be demanding, if you mix references from different manufacturers in the same chassis, or if you want to ensure reliability in a mobile setup (recording, control room, remote sessions) where power stability and robustness are essential.
In both home and professional studios, the OST-4 V2.0 can also contribute to achieving a cleaner result on high-gain stages. The manufacturer specifically notes that
many Series 500 modules can show
lower self-noise and improved performance when racked in the OST-4 V2.0, often with a noticeable benefit on
mic preamps.
On Slot Technology: Power Supply Per Slot, Regulation, and Isolation
The core feature of the OST-4 V2.0 is its "per slot" power supply design. Concretely, each channel/slot has a
separately regulated and
isolated power supply from the others. This architecture limits the propagation of disturbances (load variations, noise, instabilities) and helps maintain stable operating conditions for each installed module.
Natural Protection Against Problematic Modules
With a common parallel power supply, a very demanding or faulty module can sometimes affect the available voltage, increase noise, or cause unpredictable behavior on other slots. The OST-4 V2.0 is designed to prevent this scenario: independent power per slot helps preserve the overall rack performance, even when installed modules have different requirements.
Current Reserve Adapted to Modern Configurations
Current modules (discrete circuits, beefy output stages, additional options, LEDs, relays, etc.) may require more current than before. The OST-4 V2.0 offers a current capacity designed to keep up with these uses, while remaining regulated and isolated. The result: you operate your modules under better conditions, with more consistent behavior and a cleaner power base for the audio stages.
Technical Specifications
Technology and Design
- Format: Series 500 chassis/rack
- Number of slots: 4 slots
- Technology: On Slot Technology (power supply per slot, individual regulation, channel isolation)
Power Supply and Available Currents
- Maximum audio rail current: 1.8 A per rail (up to 2.0 A non-continuous), or 400 mA per rail per slot, whichever limit is reached first
- Maximum phantom power current: 140 mA
Mains Power Supply
- Operating voltage: 100-240 VAC
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