The 500 series was originally started by Aphex, purchased by API, and has exploded in recent years. There are many offerings to choose from in preamps, equalizers (EQ), compressors and more.


Microphone preamp and instrument direct inject (DI) units compatible with the 500 series power supplies (API and others).
Compressor / limiters available for the 500 series format power supplies from API and others.
Equalizers available for the 500 form factor, ready to carve up your tracks to fit in the mix.
Rack mount and power supplies for 500 form series preamps, compressors, EQ's and more.
Displaying products 1 - 25 of 25 results
Safe Sound Audio P501
Fake Price: $999.00
Real Price: $699.00
Safe Sound Audio P501
500 Series Preamp / DI also accepts line level input, full compressor and limiter on board for tracking and mixing duties
A-Designs 500 HR RACK
Fake Price: $335.00
Real Price: $299.00
A-Designs 500 HR RACK
Powers 2 "500" series modules from most manufacturers.
A-Designs EM-BLUE
Fake Price: $895.00
Real Price: $795.00
A-Designs EM-BLUE
Brighter top, slight mid scoop and tight bottom sound.
A-Designs EM-GOLD
Fake Price: $895.00
Real Price: $795.00
A-Designs EM-GOLD
More mellow midrange, good upper mid presence and tight bass.
A-Designs EM-PEQ
Fake Price: $1,450.00
Real Price: $1,295.00
A-Designs EM-PEQ
"Pultec" style EQ with an electric sound, capable of big things!
A-Designs EM-RED
Fake Price: $895.00
Real Price: $795.00
A-Designs EM-RED
More forward midrange, dark-ish top and big bottom sound.
A-Designs EM-SILVER
Fake Price: $895.00
Real Price: $795.00
A-Designs EM-SILVER
Big bottom, forward top, kick drum pre from heck.
A-Designs P1
Fake Price: $895.00
Real Price: $795.00
A-Designs P1
Pacifica inspired single 500 preamp, tight and punchy.
Burl Audio B1
Fake Price: $899.00
Real Price: $775.00
Burl Audio B1
500 Series Transformer I/O Mic Preamp / DI
Chameleon Labs 7681
Real Price: $399.00
Chameleon Labs 7681
Preamp / DI for 500 API Compatible Power Supply, Transformer In & Out, 1081 Clone
Chameleon Labs CPS-501
Real Price: $199.00
Chameleon Labs CPS-501
500 API Compatible Power Supply
Elysia xpressor 500
Fake Price: $999.00
Real Price: $975.00
Elysia xpressor 500
Stereo Compressor Limiter for API 500 Form Rack Power Supply, Dual Space
unavailable
Empirical Labs EL500 Rack
Real Price: $399.00
Empirical Labs EL500 Rack
Empirical Labs EL500 Rack
Great River Harrison 32EQ
Fake Price: $1,010.00
Real Price: $775.00
Great River Harrison 32EQ
500 Series Equalizer w/ 4 Band and Hi Pass / Low Pass Filters, Recreation of Original Harrison 32 Consoles
Great River MP-500NV
Fake Price: $1,034.00
Real Price: $795.00
Great River MP-500NV
Single channel 500 series rack module, classic 70s vintage circuit styling
LaChapell Audio 503
Fake Price: $895.00
Real Price: $850.00
LaChapell Audio 503
Single Channel Equalizer 500 Format, Solid State Design
LaChapell Audio 583E
Fake Price: $2,025.00
Real Price: $1,690.00
LaChapell Audio 583E
Single Channel Preamp / Equalizer for 500 API Format, Can Act as Separate Channels,
LaChapell Audio 583S
Fake Price: $1,349.00
Real Price: $1,150.00
LaChapell Audio 583S
Single Channel Tube Preamp for 500 API Format, ECC83/12AX7 Tubes, Transformer In, Active Balanced Outputs
Pete's Place Audio BAC-500
Real Price: $995.00
Pete's Place Audio BAC-500
500 Series FET Compressor / Limiter, Dual Sidechain Select, Distortion Mode, True Bypass
Roll Music TUBULE
Real Price: $1,000.00
Roll Music TUBULE
500 Series tube preamp, serious harmonic overtones
ShinyBox Guillotine
Real Price: $500.00
ShinyBox Guillotine
High Pass / Low Pass Filter Equalizer for 500 Form Power Supplies, 32 Frequencies Per Band
ShinyBox Si
Real Price: $500.00
ShinyBox Si
500 series transformerless mic pre
Speck Electronics ASC-V
Fake Price: $869.00
Real Price: $735.00
Speck Electronics ASC-V
500 series 4 band equalizer
Triton Audio D2O Tube-FET 500
Real Price: $649.00
Triton Audio D2O Tube-FET 500
Mono Tube FET Preamp, 500 API Series Compatible
TRUE Systems pT2-500
Fake Price: $695.00
Real Price: $625.00
TRUE Systems pT2-500
Preamp / DI for 500 Series, Features +70dB of Clean Gain, Thru-put on DI