Pineville, NC, United States
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Heritage Audio OST-4 V2: A 4-Slot 500 Series Rack Done Right
The Heritage Audio OST-4 V2 is a 4-slot 500 Series enclosure with On Slot Technology, giving each module its own individually regulated and isolated power supply. A 500 Series enclosure houses the modular preamps, EQs, and compressors that follow the 500 Series format, supplying them power and connections. Where most racks simply feed every slot in parallel, this chassis treats each slot as its own clean power zone. For a small studio building a modular collection, it is a rack that brings out the best in the gear it holds.
On Slot Technology: A Dedicated Supply per Slot
On Slot Technology is the heart of the OST-4 V2, giving each of the four slots its own regulated and isolated power. Isolating the slots means a demanding module cannot rob current from its neighbor or inject noise into the rest of the rack. Many 500 Series devices actually exhibit lower self-noise and better performance in this enclosure, especially microphone preamps. The payoff is quieter, more consistent results from every module installed.
Power for the Most Demanding Modules
Each slot delivers up to 400 mA of audio-rail current, with 140 mA of phantom power available for modules that need it. Experienced engineers know that certain power-hungry Class A or vacuum-tube modules can cause a rack to brown out or simply refuse to work. The OST-4 V2 supplies the current those demanding designs require while keeping adjacent slots unaffected. That headroom makes it compatible with the widest range of 500 Series modules, including double-wide units.
Channel Link Without Patch Cables
A rear-panel Link button connects one channel's output to the next slot's input internally, with no patch cables required. Chaining modules this way lets you build a signal chain such as a preamp into an EQ into a compressor in seconds. Removing external patching keeps the rack tidy and the signal path short. It is a small feature that speeds up everyday tracking and mixing.
Universal Power and Rugged Portability
A universal 100-240V AC supply runs the OST-4 V2 anywhere, so it travels between rooms, cities, or countries without adapters beyond a mains cable. The four-slot format is compact and rugged, built to the same standards as the rest of the Heritage Audio range. That portability suits engineers who carry a core set of modules to different sessions. It is a grab-and-go home for a modular front end.
Cleaner, Quieter Performance From Your Modules
Because each slot is individually regulated, interference between modules drops and the noise floor stays low. A clean, isolated power feed lets a preamp reach its full quiet potential rather than fighting a shared supply. Gold-plated balanced XLR connections keep the input and output path solid and reliable. The result is a rack that protects and elevates the modules inside it.
Compatibility With Any 500 Series Module
The 500 Series format is a long-standing standard, and the OST-4 V2 is designed to house any module that follows it. Support for double-wide modules and even the most demanding Class A and tube designs means there are no awkward exceptions. That broad compatibility lets you mix brands and module types freely across the four slots. It is a safe foundation for a collection that will keep growing.
Who the OST-4 V2 Is For
Home and project studios starting a 500 Series collection will appreciate the compact four-slot footprint and clean power. A mobile engineer can carry a preamp, EQ, and compressor to any session in one rugged enclosure. Producers who want their modules to perform at their best, rather than merely fit somewhere, are the target here. For a focused modular rig, the OST-4 V2 is the portable, reliable core.
Price$419
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