***A Designs 500 HR RACK*** This is a 2-slot 500 Series Frame w/ internal power supply Frame and supply for any two A Designs 500 cards;power status indicator LEDs, and XLR in/out. ***API 525*** Reissue of API's original 525 from the early 70’s Peak detecting "feedback" compressor/limiter Variable Threshold and Output levels Unique "Ceiling" control combines key functions VU meter for monitoring gain reduction 4 Switchable release modes De-ess function Traditional API fully discrete circuit design Hardwire bypass With the API 525, you get the sound of API's famous 525 — a modular compressor originally introduced in the 1970s. This compressor reissue is a "feedback" type of compressor, for classic sonic character and exceptional dynamics control behavior. Onboard the API 525, the cool multi-function "ceiling" control can lower threshold while raising output level to match, so you can adjust dynamics without changing level. As part of API's modular 500 Series, you'll enjoy classic-but-versatile character in a flexible and reasonably priced design, with the API 525. ***API 512c*** Mic Preamp with 65 dB of gain Front and Back Panel Mic InputAccess Line/Instrument Preamp with 50 dB of gain Front and Back Panel Line/Instrument Input LED VU meter for monitoring output level 20 dB pad switch, applies to mic/line/instrument 48v Phantom switchable power Traditional API fully discrete circuit design Uses the famous API 2520 Op-Am Fitting into API's 500-series modular chassis, the API 512c has nothing but legendary heritage. This microphone preamplifier evolved from the original 1967-era 512 - API's first-ever modular mic pre - and it's brimming with that classic's same sonic character. All in all, you get an API console-level microphone preamplifier in a design that's totally expandable and realistically portable. If you're looking for classic preamp character, then you've found it: the API 512c.