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Analogue/Digital Hybrid USB Audio Interface, Summing Mixer, and 500 Series Rack

SRP £1,332.50 + VAT

500R8 is the centrepiece to the modern studio. It's an analogue/digital hybrid USB audio interface that combines our favourite analogue characters with digital precision by offering a completely customisable 500 series analogue front-end as well as an abundance of high-performance AD/DA conversion that is required for the modern DAW-based workflow.

It also features all of the studio essentials you need such as a comprehensive monitor controller with talkback facility, 16 channel ADAT interface, Zero-latency artist mixer, and 8-into-2 analogue summing mixer.

The Best Of Analogue Character - Thanks To 500 Series

500R8 puts performance capture back at the heart of your recordings and back into the hands of the audio engineer. By capitalising on the vast and ever growing 500 series market, 500R8 allows you to configure your own custom analogue front-end directly into your DAW for recording. Fill 500R8 full of vintage preamps for recording drums, clean and pristine preamps for recording strings, or even create you own Preamp/EQ/Compressor channel strips and commit those to your recording; the possibilities are endless.

500 series integration doesn't stop once the performance has been captured... Dedicated USB source-select switches for each 500 series slot allows you to send your recorded stems/VSTs back through your 500 series EQs/Compressors and print their effects back into your DAW for hands-on, all-analogue processing. 500R8 also features an 8-into-2 high-headroom analogue summing mixer that you can use to sum your instrument stems into a stereo track to be recorded back into your DAW using a dedicated stereo ADC.


Digital Precision

Having a near-limitless selection of analogue preamps to pick from would be pointless if 500R8's conversion applied its own colour and effects. In order to capture every subtle nuance of your analogue signal, 500R8 features reference-class analogue-to-digital conversion with 121dB (unweighted) signal-to-noise ratio and a master-reference grade internal digital clock with ultra-low jitter (0.5 picoseconds). The combination of highly-accurate, low-jitter clocking and high-performance, low-latency digital conversion ensures that every ounce of analogue character is captured with the utmost detail - free of unwanted digital artefacts from the conversion process and with a wide dynamic range thanks to 500R8's high-headroom and low-noise floor analogue design.

USB 2.0 Audio Interface

Cranborne Audio's USB 2.0 audio interface implementation provides the high channel-count requirement at the lowest possible latency whilst still being accepted by all major recording devices with unparalleled stability and longevity. 500R8 is core audio compliant for Mac and features a lightweight control panel for Windows machines that absorbs as little resources as possible to leave you with more power for plug-ins in your DAW.

In the interest of being compatible with the widest range of devices, 500R8 also includes a full complement of 5-pin MIDI I/O, Word Clock I/O via BNC, and S/PDIF I/O at sample rates up to 192kHz.

Monitor Controller

Hearing how your mix translates on a wide range of reproduction mediums is a crucial part of a modern studio environment. To facilitate this, 500R8 features a comprehensive monitor controller with a ultra high-headroom (26.5dBu) balanced speaker A Output, a discrete speaker B output, and seamless speaker switching between the two. There's also a Mono button that sums L-R channels to check for mono compatibility, a DIM switch that drops the control room output for relaxed discussions during recordings, and a speaker mute switch for when you are tracking in the control room with headphones.

500R8 also features a comprehensive Talkback section with XLR input, 48v phantom power, push-to-talk operation, and automatic signal routing to all CAST and headphones outputs connected to the system.

Zero-Latency Artist Mixer

500R8 moves away from clunky "virtual" mixers and gets your hands back onto the mix by using a high-headroom analogue summing mixer to create zero-latency, all-analogue artist mixes that can be blended with the one of two discrete DAW playback paths and sent to your musicians via CAST or the local headphone outputs.

Summing Mixer

Analogue summing can give your mix the final bit of analogue character required to achieve professional and polished sonic results. What makes 500R8's 8-into-2 channel summing mixer so special is that it is positioned after the 8 500 series slots - allowing you to insert saturation or subtle 'bus-compression' modules and create a stereo mix using dedicated analogue level and pan controls. 500R8's summing mixer also has a dedicated ADC which can be used to send your stereo mix into your DAW with a massive 26.5dBu of headroom.

Cast Equipped

CAST stands for Cat5 Analogue Snake Transport and enables cost-effective and organised cable management around your studio by repurposing off-the-shelf shielded Cat5 Networking cables to transport 4 channels of balanced analogue audio (mic, Line, or Instrument level) over a single cable.

500R8 has 4 CAST In ports that allow you to connect any of our breakout boxes (to be announced soon) and place analogue I/O where you need it - whether it's in the live room, vocal booth, or the bedroom next door.Our clever impedance matching means that the signal quality can exceed that of a mic cable for a fraction of the price and over a distance of up to 100m. CAST is 100% analogue and requires ZERO setup. Plug one end of the cable in one box, and the other end into 500R8 and it just works. No setup. No latency. No fuss. And it sounds great.

Manufactured in the UK

To ensure that every product bearing the Cranborne Audio name is worthy of studio environments big or small, all 500R8's are manufactured in the UK under the company's founders and their watchful eye's. 500R8 is carefully assembled by a skilled workforce with immense attention to detail and each and every product is tested thoroughly by a skilled engineer before shipping to destinations around the world.


  • 28-in/30-out USB 2.0 audio interface
    Low-latency USB 2.0 interface with high-stability and compatibility with a wide range of PC/macOS devices.
    ADAT I/O (16/16 channels @ 44.1/48kHz, 8/8 channels @ 88.2/96kHz
    S/PDIF I/O
    5-pin MIDI I/O

  • High-performance A/D conversion
    Dynamic Range: 121dB A-weighted, AES17 method, 20Hz - 20kHz
    Frequency Response: -1dB, 2.2Hz to >80kHz
    THD+N: Max Input Level: +24dBu

  • High-performance D/A conversion
    Dynamic Range: 121dB A-weighted, AES17 method, 20Hz - 20kHz
    Frequency Response: -1dB, 61kHz
    THD+N: Max Output Level: +24dBu

  • Master reference-quality internal clock
    Capable of 44.1, 48, 88.2, 96, 176.4, and 192kHz operation
    Dedicated Word Clock Input and Output via BNC
    External sync options using Word Clock BNC, S/PDIF, or ADAT

  • Monitor controller with talkback
    Speaker A/B switching, Mono check, Dim, Mute, and 28-segment peak meter
    Dedicated talkback input with phantom power, push-to-talk activation, and automatic routing to all headphone and C.A.S.T. facilities
    Easy-access illuminated front panel controls for all monitor controller functions.

  • Analogue summing mixer
    8-into-2 analogue summing mixer with +26.5dBu of headroom, dedicated ADC, and balanced 1/4" jack outputs
    C.A.S.T. link port for increasing summing mixer to 16-into-2 using Cranborne Audio 500ADAT

  • Zero-latency artist mixer
    Zero-latency analogue artist mixer with physical level/pan controls per channel and DAW return blend controls
    2 high-power headphone outputs with independent blend and level controls

  • Reference-Quality Headphone Outputs
    THD+N: Output Wattage (1kHz): 250mW x 2 @ 600 ohms, 650mW x 2 @ 220 ohms, 1.21W x 2 @ 100 ohms, 500mW x 2 @ 32 ohms
    Frequency Response: 1dB, 70kHz

  • High-current 8-slot 500 series rack
    250mA current per-slot with 2A total for all slots
    XLR inputs, XLR line outputs, and TRS Inserts (pre-ADC) per 500 series slot
    Module source switching options to send Analogue, USB or external C.A.S.T. signals through your favourite 500 series modules
    Module bypass switches per-slot allowing 500R8 to be used without 500 series modules inserted.

  • C.A.S.T. Compatible
    C.A.S.T. ports per channel for relocating analogue I/O around studio using passive or active C.A.S.T. breakout boxes via standard shielded Cat 5

  • 24v, 5a external locking power supply
    External power supply for improved analogue audio performance and heat dissipation.

  • Designed, Engineered, and Manufactured In The UK
    Each and every 500R8 is extensively tested by a team of dedicated engineers to ensure reliability and consistency.

500R8 and 500ADAT are two revolutionary 500 series racks featuring elite-quality AD/DA conversion, ultra low-jitter clocking, summing mixers, and reference headphone amplifiers built-in to their 4U frames. Both are designed to integrate all the benefits of 500 Series modules into brilliant hybrid studio workflows not previously possible. But whilst on the outside their differences look minimal, these two racks are designed for completely different users - integrating into your studio in completely different ways.

Deep dive into the physical and applicational differences between the two units to help you decide which one would work best in your studio in this dedicated blog

"The 500R8 could easily be the centrepiece of any serious recording/mixing setup: it's a top-notch audio interface, a capable 500-series host chassis, an expandable analogue summing mixer, and more besides." - Read the full review from Sound on Sound here

The 500 series format is the most cost-effective, and flexible way to add a variety of analogue gear into your studio, but it’s never been the easiest system to integrate into your studio setup. Until now.

1. Goodbye To Cable Spaghetti

500ADAT seamlessly integrates the 500 series format into your studio without running multiple analogue cables to and from your audio interface’s I/O. D-subs, XLRs, and TRS jacks cost money, take up space, and look unsightly. 500ADAT exchanges all of that copper for 2 optical cables. With 500ADAT, there are less physical electrical contacts to go wrong and less margin for error during patching. Spend more time making music and less time patching.

2. Get More Recording And Playback Channels From Your Audio Interface

Moving 500 series connectivity away from analogue lines to ADAT means that all of your interface’s analogue I/O is freed up and available for use elsewhere. ADAT is often left unused on audio interfaces whilst precious analogue I/O is permanently plumbed into your 500 series rack or patch bay. Move your 500 series modules to those dusty ADAT ports, free up those Line Ins and outs, and utilise more of your audio interface’s available I/O.

3. Upgrade Your Conversion

With converters and digital clocking built-in that exceeds the technical performance of the best audio interfaces on the market, 500ADAT not only gives you more channels during recording and mix down, but also elevates your sonic capture capabilities to the next level with huge dynamic range, inaudible THD+N, and less than 0.5 picoseconds of clock jitter.

4. Simplify Your Hybrid Studio Workflow

Remove the complexities of analogue I/O levels, re-patching, and patch bays by moving towards a simpler, yet more advanced integration of 500 series and other analogue equipment. 500ADAT’s module source switches allow for Analogue XLR or ADAT sources to be routed through the 500 series modules at a flick of a switch. 500ADAT is a completely optimised and fool proof way of using 500 series during recording and mixing.

5. 500 Series Made Easy, and Made Better

Not only does 500ADAT sit in the same place as your current 500 seres rack and analogue cabling, but it also brings much, much more to your studio capabilities. It also features a reference-class headphone amplifier and a high-headroom analogue summing mixer in one integrated, high-performance, and streamlined package.

Read more here 

Digital Performance
A/D Conversion
Test Signal PathXLR Input - 500 Series A/D Converter - APx555 (ASIO)
Frequency Response-1dB, 2.2Hz to >80kHz--0.05dB, 20Hz to 20kHz
THD+N<0.00032% (-110dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.00065% (-104dB) @ -1dBFS, 20Hz - 40kHz, 1kHz, A-weighted
THD<0.00014% (-117.5dB) @ -8dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.00023% (-113dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.0006% (-105dB) @ -1dBFS, 20Hz - 40kHz, 1kHz, A-weighted
Dynamic Range121dB A-weighted, AES17 method, 20Hz - 20kHz
Max Input Level+24dBu
D/A Conversion
Test Signal Path500 Series D/A Converter - Insert Send - APx555 (ASIO)
Frequency Response-1dB, <1Hz to >61kHz--0.05dB, 20Hz to 20kHz
THD+N<0.0003% (-110.5dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.0004% (-108dB) @ -1dBFS, 20Hz - 40kHz, 1kHz, A-weighted
THD<0.00014% (-117.5dB) @ -8dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.00018% (-115dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted-<0.00036% (-109dB) @ -1dBFS, 20Hz - 40kHz, 1kHz, A-weighted
Dynamic Range121dB A-weighted, AES17 method, 20Hz - 20kHz
Max Output Level+24dBu
Test Signal PathDAW 2 D/A Converter - Line Outputs - APx555 (Line In)
Connection Type1/4" Jack, Impedance Balanced
Output Impedance150ohm balanced, 75ohm unbalanced
Max Output Level<+22dBu
Freq Response-1dB, 1.4Hz to >80kHz
THD+N<0.003% @ +18dBu, 1kHz
Dynamic Range105dB A-weighted, AES17 method, 20Hz - 20kHz
Noise Floor<-93dBu A-weighted, 20Hz - 20kHz, (Unity Gain)
Speaker A Output
Test Signal PathDAW 2 D/A Converter - Speaker A Line Output - APx555 (Line In)
Connection TypeXLR, Balanced, non-floating
Output Impedance150ohm balanced, 75ohm unbalanced (pin 3 unconnected)
Max Output Level<+26dBu
Freq Response-1dB, <1Hz to 70kHz
THD+N<0.0016% @ +24dBu, 1kHz
Dynamic Range109dB A-weighted, AES17 method, 20Hz - 20kHz
Noise Floor<-92.5dBu A-weighted, 20Hz - 20kHz, (Unity Gain)
Talkback Input
Gain30dB Fixed Gain Preamp, +20dB Analogue Trim
Phantom PowerAlways On
Summing Mixer
Test Signal PathXLR Input - Summing Mixer Bus (Unity) - A/D Converter 9/10 - APx555 (ASIO)
Freq Response-1dB, 2.25Hz to >80kHz--3dB, 1.2Hz-0.5dB, 3Hz
THD+N<0.0007% @ +23dBu (-1dBFS), 1kHz
THD<0.0003% @ +14dBu (-10dBFS), 1kHz-<0.0004% @ +20dBu (-4dBFS), 1kHz-<0.00055% @ +23dBu (-1dBFS), 1kHz
Dynamic Range108dB A-weighted, AES17 method, 20Hz - 20kHz
Noise Floor (A/D 9-10)-108dBFS A-weighted, 20Hz - 20kHz
Max Contribution Level+28dBu
Pan Law-4dB
Noise Floor (Mix Output)-90dBu, A-weighted, No channels routed
Headphone Amp
Test Signal PathDAW 2 D/A Converter - Headphone Output - APx555 (Line In)
Frequency Response-1dB, <1Hz to >70kHz
THD<0.0006% (-104.4dB) @ 20dBu, 1kHz, A-weighted, 300ohm load
THD+N<0.00085% (-101.4dB) @ 20dBu, 1kHz, A-weighted, 300ohm load
Output Impedance0.33 Ohms
Output Wattage250mW x 2 @ 600 ohms, 1kHz-650mW x 2 @ 220 ohms, 1kHz-1.21W x 2 @ 100 ohms, 1kHz-500mW x 2 @ 32 ohms, 1kHz
Dynamic Range114.5dB A-weighted, AES17 method, 20Hz - 20kHz, 300ohm load
Noise Floor-93.5dBu A-weighted, 20Hz - 20kHz, 300ohm load
System Performance
Analogue Path Phase Performance
Test Signal PathXLR Input - Empty 500 Series Slot - Summing Mixer Bus (unity) - Monitor Bus - Speaker A Output - APx555 (Line In)
Phase<3.6° @ 20Hz, <22° @ 20kHz
Test Signal PathXLR Input - Empty 500 Series Slot - Summing Mixer Bus (unity) - Mix Output - APx555 (Line In)
Phase<1.5° @ 20Hz, <11° @ 20kHz
Test Signal PathXLR Input - Camden 500 Preamp (Mic Mode, 6dB Gain) - Summing Mixer Bus (unity) - Speaker A Output - APx555 (Line In)
Phase<3° @ 20Hz, <13.5° @ 20kHz (Preamp mic mode, 6dB Gain)
Digital Round-trip Performance
Test Condition500 Series D/A Converter - 500 Series A/D Converter - APx555 (ASIO)
Dynamic Range118dB A-weighted, AES17 method, 20Hz - 20kHz
THD+N<0.0004% (-108dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted
AC Requirements100V – 240V AC, 50 – 60 Hz
Total Power Consumption24v, 5A DC, 120w
500 Series Slot Current250mA per rail
Total Available 500 Series Slot Current2A
Operating Temperature+1 to 30 degrees Celsius
Storage Conditions-20 to 50 degrees Celsius
Width481mm(19"), Rackmount
Height185mm(7"), 4u
Unit Weight7kg