TK Audio MB1 500 Series Stereo Processor Mini Blender - Boxed

Nekotronics Busscat Stereo SSL style 500 series compressor

Elysia Karacter 500 Series Saturation Colouration Processor Stereo Dual Mono MS

Solid State Logic SSL 611EQ 500 Series EQ Module

DIYRE Colour Palette - 500 Series

Solid State Logic SSL B-Dyn 611B - 500 Series Dynamics Module

IGS Audio One LA 500 Series Tube Opto Compressor Module (LA-2A-style)

SSL Solid State Logic G Comp MKII 500 Series Stereo Bus Compressor Module