500 Series


500 Series format chassis and signal processing modules.


API 550B 4 Band EQ

  • Brand: API
  • Item ID: SKU-1918

Discrete 4 Band EQ


  • Four bands of our famous sounding equalization
  • Each band offers seven API selected frequency centers
  • Reciprocal and repeatable filtering
  • 12 dB of boost/cut per band
  • EQ band 1 and 4 offer shelf/peak switching
  • "Proportional Q" narrows filter Q at extremes
  • Traditional API fully discrete circuit design
  • High headroom +30 dB clip level
  • Re-issue of 1967 API 550 EQ with an extra band

Based on API's original 550 from the late '60s, the API 550b is a continuation of the EQ that played a major role in the history of music recording, but ...

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  • Brand: FMR Audio
  • Item ID: SKU-2190



• Single-channel, 500-series version

   of the RNLA.

 • Balanced input & output.

 • Linkable for stereo operation.

   • Maximum input/output levels of


 • Overcurrent protection circuits 

   safeguard 500-series rack operation

   in case of power supply faults.

  • 24-bit arithmetic for smoother


 • Linear & Logarithmic Release modes.

  • Accurate signal level metering via

   power-saving "dot" gain-reduction


 • Sealed, C&K subminiature toggle


 • Red-anodized, machined aluminum


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Rupert Neve Designs 543 - 500 Series Mono Compressor-Limiter

  • Brand: Rupert Neve Designs
  • Item ID: SKU-2745

The 543 Mono Compressor delivers the unobtrusive, musical-sounding dynamic control and brick-wall limiting made famous in the Portico 5043 to the 500 series format. The 543 features a fully controllable compressor-limiter with feed-forward / feedback modes, Peak / RMS detection and a built in side chain high pass filter. With an unrivalled heritage and a tremendous feature set, the 543 yields a combination of rich warmth, flexibility and precision that is sure to resonate in the ears of sound engineers the world over.


Built around Mr. Rupert Neve’s custom transformer designs, each 543 module encompasses individually controllable threshold, attack, release, makeup ...

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Radial PhazeQ

  • Brand: Radial
  • Item ID: SKU-1090

Radial PhazeQ™ Adjustment Tool

    •    Phase align any two signals for natural tone
    •    Create exciting radical EQ curves
    •    100% discreet analogue with class-A circuitry
    •    Variable low-pass filter to focus fundamentals

The PhazeQ is a dual function 500-series device. As a phase alignment tool, it is used to time-align two microphones for greater clarity and realism. It also behaves like a very powerful EQ that lets you create exciting new tones that will set your recordings apart.
Designed to work with the Radial Workhorse and other 500 series racks, the PhazeQ features 100% discreet ...

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Radial JDV Pre LB

  • Brand: Radial
  • Item ID: SKU-1073

Radial JDV-Pre Instrument Preamp and DI

  • 100% discrete class-A instrument and mic preamp
  • Feed forward front-end, void of negative feedback
  • AccuState gain control for low noise at all levels *

Variable low frequency cut for acoustic instruments The Radial JDV-Pre is a unique preamplifier designed specifically to capture the natural tone and distinct character of the instrument. This may sound like another 'marketing line', but unlike mic preamplifiers that are centered on 'the microphone', the JDV-Pre is completely focussed on the various types of pickups used while transferring the signal without introducing distortion or artefact of any type. The design begins ...

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Warm Audio WA12 500 Series - Microphone Preamp

  • Brand: Warm Audio
  • Item ID: SKU-2919

Warm Audio WA12 500 Series - Microphone Preamp

A lot of preamps on the market do a good job of raising the volume of mics and instruments.  Unfortunately, many pres are doing only that, raising volume.  The “Super clean” designs of today often leave the signal exiting the preamp sounding much the same as it did entering it.

Warm Audio personally like to use preamps that make the signal sound different than it did entering the pre.  They like preamps that shape my tone with warmth, character and vibe.  If you are looking for a preamp to improve and shape your signal you ...

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Radial Space Heater 500

  • Brand: Radial
  • Item ID: SKU-3412

Designed for use in the Radial Workhorse or any other 500 series rack, the Space Heater is built around a 12AX7 tube. First, a drive control lets you determine the amount of signal passing through the tube. Next, a 3-position heat switch allows you to apply 35, 70 or 140 volts at the plate to change how the tube reacts to the signal. At the low 35V setting the tube is starved for voltage which causes the tube to break up at a very low volume. The middle 70V setting is a great starting point and allows the tube to ...

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Radial JDX LB

  • Brand: Radial
  • Item ID: SKU-1086

Radial JDX™ Reactor Speaker Simulator

    •    Guitar amp interface and cabinet simulator
    •    Reactive load captures sound from head and cabinet
    •    Direct record option for quick tracking
    •    Delivers consistent great tone each time

The Radial JDX™ Reactor™ is a unique guitar amplifier interface designed to capture the tone of a 4x12 cabinet by either recording 'direct' or by interfacing the Reactor via an amplifier head and cabinet. This makes the JDX ideal for fast-paced recording environments such as film and gaming where take after take consistency is required. But don't let the high-speed ...

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Radial Workhorse

  • Brand: Radial
  • Item ID: SKU-1757

WR-8 Workhorse 8-Slot Power Rack

Part No. R700 0101 00 

  • 500 series power rack with room for 8 modules
  • Upgrades to full Workhorse with optional mixer
  • 100% compatible with older API type racks
  • Over 20% more current than the original spec

The Workhorse WR-8 is a trimmed down version of the Tec Award winning Workhorse power rack without the 8 channel summing mixer. This enables those that may not need a mixer to join in the fun while leaving the door open to upgrade in the future.

Like the Workhorse, the WR8 features eight slots to accommodate both Radial ...

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Solid State Logic G-Series Bus Compressor 500 Series II

  • Brand: Solid State Logic
  • Item ID: SKU-1839

Stereo Bus Compressor module for 500 format

The legendary sound of the SSL Stereo Bus Compressor has been glueing mixes together for 35+ years...it is now available for the 500 format rack.

Often imitated but never equalled, the centre section compressor from the 1980's G-Series analogue console is an audio production legend. It is a simple unit with a simple purpose; it makes complete mixes sound bigger, with more power, punch and drive. It brings cohesion and strength to your mix without compromising clarity. To this day it remains a key element of the SSL sound and has ...

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Meris Mercury7 500 Series Reverb

  • Brand: Meris
  • Item ID: SKU-7451

Meris Mercury7 Reverb

Meris' flagship reverb design. 500 series accommodates the highest quality signal path available in pro audio and entirely custom algorithms take you to the apex of ambient exploration.

  • Handcrafted Algorithmic Reverbs
  • Analog Mix & Dry Signal Path
  • Intra-Tank Pitch Regeneration
  • High & Low Frequency Damping
  • Extensive Modulation Capability
  • Variable Auto Swell Envelope
  • Premium analog signal path and 24-bit AD/DA w/32 bit floating point DSP
  • Stereo and Surround Linkable
  • Designed and Built in Los Angeles, California U.S.A.

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API 527 Compressor/Limiter

  • Brand: API
  • Item ID: SKU-1916



  • Audio circuit uses the 2510 and 2520 Discrete Op Amps with transformer output
  • Continuously variable detented Threshold control
  • Continuously variable detented Attack and Release controls
  • Continuously variable detented Ratio control
  • Output Fader level control
  • 10 segment VU/Gain Reduction meter with selector switch
  • Overload LED
  • "Link" switch for multiple unit interdependent compression linking
  • "New"/"Old" switch for feed-forward or feed-back compression
  • "Hard"/"Soft" compression curve knee switch
  • Patented THRUST® switch for frequency dependent side chain control
  • "IN" switch with hard relay bypass when in the "Out" position

The API 527 takes it's place alongside the ...

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