The 500HR is a dual-slot, single-space, rack-mounted frame with power supply for A-Designs and other 500 Series compatible audio modules including:A-Designs EM-PEQ Equalizer #241581A-Designs EM-Gold Preamp Module #180029A-Designs P1 Single Channel Microphone Preamp Module #189906A-Designs 500-Red Microphone Preamplifier #189907A-Designs 500-Blue Microphone Preamplifier #189908A-Designs 500-Silver Microphone Preamplifier #189909You are able to use the 500HR and A-Designs module combinations in four basic ways: Loaded with two preamps it becomes a dual-channel mic preamp Loaded with two EQs, it is a dual-channel EQ Loaded with one preamp and one EQ it is a complete pre/post EQ recording channel Use one preamp and the EQ in the 500HR and bypass your pre on your guitar/bass/keyboard amplifier and have a totally different amp for any live situation! More details about product A-Designs 500HR Rackmount Frame for 500 Series Modules
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