No doubt 500 Series has become the standard for analog outboard in recent years.
The format is convenient and the absence of a dedicated power supply per unit lowers the cost significantly.
However it should never be forgotten that the power supply is an integral part of any audio gear. For example, noise and distortion performance cannot be measured without taking the power supply out of the equation, and the figures obtained will greatly depend on the quality of the same.
To make things more complicated, connecting several modules to the same power supply effectively connects the modules´ audio paths themselves, making audio artifacts like crosstalk and induced noise another possibility.
OST (On slot technology ) eliminates all these issues by powering the modules on a per slot basis. This means that each slot has its own linear regulation stages, effectively “disconnecting” each one from the rest. Last generation power technology has been used to minimize heat and waste of power.
Transients and current demanding peaks happening in a module would no longer affect the performance of adjacent ones and noise is improved. Artifacts caused by module interaction are no longer possible and the chance of ground loops is minimized.
With literally hundreds of different 500 series modules from dozens of manufacturers out there in the market , we at Heritage Audio believe that On Slot Technology (OST) is the professional way of sharing a 500 Series enclosure. In fact, in a Heritage Audio OST enclosure, all the modules share is the metalwork.
Heritage Audio OST enclosure´s offerings cover all the count needs, from the extremely popular 4 slot OST-4 to the 8 slot MCM-8 summing mixer/500 Series enclosure, to the 6 and 10 slot OST-6 and OST-10.
The whole range can be compared here: https://www.heritageaudio.net/500-series-ost-enclosures-overview/