R8

500R8

28/30 USB Audio Interface
& 8-slot 500 series Rack

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 devices.
- 16in/16out ADAT Interface
- 2in/2out S/PDIF Coaxial Interface*
- 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: <0.00032% (-110dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted
- Max Input Level: +24dBu

High-performance D/A conversion
- Dynamic Range: 121dB A-weighted, AES17 method, 20Hz - 20kHz
- Frequency Response: -1dB, <1Hz to >61kHz
- THD+N: <0.0003% (-110.5dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted
- Max Output Level: +24dBu

Master reference-quality internal clock

- Capable of 44.1, 48, 88.2, 96, and 192kHz operation
- <0.5ps of jitter
- 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 CAST 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
- CAST link port for increasing summing mixer to 16-into-2 using Cranborne Audio 500ADAT (sold separately)

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: <0.0006% (-104.4dB) @ 20dBu, 1kHz, A-weighted, 300ohm load
- 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, <1Hz to >70kHz

High-current 8-slot 500 series rack- 
250mA current per-slot with headroom
- XLR inputs, XLR line outputs, TRS Inserts (pre-ADC) per 500 series slot
- Module source switching options to send Analogue, USB or external CAST signals through your favourite 500 series modules
- Module bypass switches per-slot allowing 500R8 to be used without 500 series modules inserted. 

CAST Compatible
- CAST ports per channel for relocating analogue I/O around studio using passive or active CAST breakout boxes via standard shielded Cat 5 (boxes coming soon).

24v, 5 amp 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.

 

*S/PDIF is not operational on v0.9 firmware.

 
Please follow the button below to read the 500R8 User Manual
 
500R8 User Manual
 
 

 

Here is the comprehensive set of 500R8’s technical specifications. We try to keep our specifications as real-world measurements. Each test has been carried out in a particular way to replicate how each element of 500R8 would perform in day-to-day operation.

 

All specifications are typical performance unless otherwise noted. All specifications are subject to change at any time. Tested with Audio Precision APx555 at 192 kHz internal sample rate and internal clock. HF response of digital measurements will vary depending on sample rate selected during recording.
Digital Performance
A/D Conversion
Test Signal Path XLR 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 Range 121dB A-weighted, AES17 method, 20Hz - 20kHz
Max Input Level +24dBu
D/A Conversion
Test Signal Path 500 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 Range 121dB A-weighted, AES17 method, 20Hz - 20kHz
Max Output Level +24dBu
Clocking
Jitter <0.5ps
Analogue Performance
Line Outputs (Speaker B, Aux, Mix)
Test Signal Path DAW 2 D/A Converter - Line Outputs - APx555 (Line In)
Connection Type 1/4" Jack, Impedance Balanced
Output Impedance 150ohm balanced, 75ohm unbalanced
Max Output Level <+22dBu
Freq Response -1dB, 1.4Hz to >80kHz
THD+N <0.003% @ +18dBu, 1kHz
Dynamic Range 105dB A-weighted, AES17 method, 20Hz - 20kHz
Noise Floor <-93dBu A-weighted, 20Hz - 20kHz, (Unity Gain)
Speaker A Output
Test Signal Path DAW 2 D/A Converter - Speaker A Line Output - APx555 (Line In)
Connection Type XLR, Balanced, non-floating
Output Impedance 150ohm balanced, 75ohm unbalanced (pin 3 unconnected)
Max Output Level <+26dBu
Freq Response -1dB, <1Hz to 70kHz
THD+N <0.0016% @ +24dBu, 1kHz
Dynamic Range 109dB A-weighted, AES17 method, 20Hz - 20kHz
Noise Floor <-92.5dBu A-weighted, 20Hz - 20kHz, (Unity Gain)
Talkback Input
Gain 30dB Fixed Gain Preamp, +20dB Analogue Trim
Phantom Power Always On
Summing Mixer
Test Signal Path XLR 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 Range 108dB 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
  -89.5dBu, A-weighted, 1 channel routed (Unity)
  -84dBu, A-weighted, 8 channels routed (Unity)
Headphone Amp
Test Signal Path DAW 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 Impedance 0.33 Ohms
Output Wattage 250mW 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 Range 114.5dB 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 Path XLR 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 Path XLR Input - Empty 500 Series Slot - Summing Mixer Bus (unity) - Mix Output - APx555 (Line In)
Phase <1.5° @ 20Hz, <11° @ 20kHz
Test Signal Path XLR 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 Condition 500 Series D/A Converter - 500 Series A/D Converter - APx555 (ASIO)
Dynamic Range 118dB A-weighted, AES17 method, 20Hz - 20kHz
THD+N <0.0004% (-108dB) @ -4dBFS, 20Hz - 40kHz, 1kHz, A-weighted
Power
AC Requirements 100V – 240V AC, 50 – 60 Hz
Total Power Consumption 24v, 5A DC, 120w
500 Series Slot Current 250mA per rail
Total Available 500 Series Slot Current 2A
Environmental
Operating Temperature +1 to 30 degrees Celsius
Storage Conditions -20 to 50 degrees Celsius
Dims/Weights
Unit
Width 481mm(19"), Rackmount
Height 185mm(7"), 4u
Depth 219m(8.6")
Unit Weight 7kg
Shipping Carton
Width 550mm(21.7")
Height 280mm(11")
Depth 335m(13.2")
Weight 7.5kg

Please download the latest drivers below for your 500R8 to operate on Windows devices. 

Download Driver (Windows)

*Driver compatible with Windows 7, and Windows 10.

500R8 is class-complaint on macOS and does not require drivers to operate.

The Centrepiece To Your Studio

500R8 is the new home for 8 of your favourite 500 series modules. It's also your new 28/30 channel USB audio interface, monitor controller, ADAT interface, and discrete analogue summing mixer.

Services-Icon1.png
Analogue Character

500R8 takes analogue electronics and USB integration to the next level by allowing you to utilise your favourite 500 series modules as your very own customisable tracking front-end directly into your DAW.  Dedicated USB source selects for each slot and a discrete analogue summing mixer with it's own USB send allows you to bring your 500 series modules- such as EQs, compressors, and saturation devices -into your mixing process and bring analogue sound back into your workflow.
Services-Icon1.png
Digital Precision
500R8 features reference-class analogue-to-digital conversion with 121dB (A-wtd) dynamic range and a master-reference grade internal digital clock with ultra-low jitter (<0.5 picoseconds). The combination of highly-accurate clocking and high-performance digital conversion ensures that every subtle nuance of your analogue signal is captured with the utmost detail, free of any unwanted digital artefacts from the conversion process and with a wide dynamic range due to 500R8's high-headroom and low-noise floor design.

The Studio Essentials

USBMidi_Ports

USB Audio Interface


Build your dream studio around 500R8's built-in 28-in/30-out channel USB audio interface that provides recording/playback of analogue and ADAT sources as well as connectivity via MIDI and clock distribution via Word-clock.

Montitor Controller Front

Monitor Controller


Control all aspects of your control room and artist monitoring setup by utilising 500R8's built-in monitor controller that includes options for Speaker A & B switching, Mono sum, Mute, Dim, and Talkback facilities.

Summing_Mixer

Discrete Summing Mixer


Give your mix the final bit of analogue character and send instrument groups and stems back-through your 500 series modules, into the discrete analogue summing mixer, summed, and sent into your DAW via USB.

World-Class Digital Performance

To create a "studio in a box" where your favourite 500 series modules could shine on your digital recordings, it was critical to ensure our digital conversion and analogue processing is best-in-class. We squeezed every possible .1dB of performance out of 500R8 to achieve digital and analogue performance that ensures that the only thing colouring your recordings are mic placements and mix decisions.

AD/DA Performance


The implementation of our converters result in extraordinary performance to ensure that every subtle nuance of your 500 series 'flavour' is translated perfectly into digital signals for mixing and processing. 

Master Reference-Quality Clock


Our internal digital clock reaches atomic-clock level accuracy, for master reference-quality with < 0.5 picoseconds of jitter. Our designs feature isolated analogue and digital ground planes and power rails so that our digital elements receive accurate clocks and our analogue signals are noise- and distortion-free.

Deep 500 Series Integration

500R8_Front_Studio Configurable Front-End


Utilising the 500 Series standard as a your own front-end puts you back in control of exactly how audio is received and processed before being sent to the DAW. Mix and match to find the best preamp combinations during recording, and then swap them out with EQ's and comps when it's time to mix.

Source_SwitchesSource Select


Each 500 series slot has 3 input source select options; Analogue In, CAST, and USB. Selecting USB allows the 500 series module to pickup audio coming via the USB stream, process it in the analogue domain, and then send it back to your DAW. There's also a Chain switch for each slot that allows you to create custom channel strips of your favourite modules.

500R8_Back_Studio

Tons Of I/O


An abundance of Inputs and outputs allows 500R8 to integrate with a number of hardware components around your studio. Combine 500R8's analogue performance with your own converters or patch outboard gear into each 500 series slot using dedicated TRS insert jacks. The summing mixer also has a dedicated mix output as well as the artist and control room mix outputs.

CASTAWAY

To get the best results out of a studio, sometimes you need to explore the space.
Perhaps that hallway has the perfect ambience for acoustic guitar, or the airing cupboard is the perfect vocal booth; being able to exploit those spaces can make the difference between great audio capture and perfect audio capture.
By using our C.A.S.T. system, you can extend the I/O of 500R8 up to 100m away from your control room using a single cat 5 cable.
R8+1_N22H_Square_LoRes_WhiteConnect one of our N22H into 500R8's C.A.S.T. Input connectors and then mic/line sources connected to N22H’s inputs are sent directly to the interface's inputs ready for recording via C.A.S.T. Meanwhile, a stereo monitor mix generated by 500R8/500ADAT is carried down the same C.A.S.T connection and directly into N22H’s high-powered headphone amplifier and dual ¼” jack line outputs for zero-latency analogue monitoring.
Use multiple N22 or N22H breakout boxes and then you can turn your home studio into a complete mutli-room complex.

N22 N22H
Learn More Learn More

ADAT Equipped

R8+ADAT

For those moments when you need more, 500R8's ADAT ports allow expansion via any 3rd party ADAT device to obtain up to 16 channels of expansion at 48kHz and 8 channels at 96kHz.

If you demand the same quality in your ADAT expander as you have become accustomed to with 500R8; our 500ADAT is the perfect choice - and it features even deeper integration than you could achieve elsewhere with mix bus linking, and ADAT playback directly into 8 additional 500 series modules.

To top it all off, when you do connect 500ADAT and 500R8 via CAST; talkback and artist monitoring is linked between the two to allow 500ADAT musicians to hear talkback and sources from the 500R8 and vice versa.

Learn more about 500ADAT:
Learn More

Portable, Dependable, And Made In The UK

Streetsign

Housed in a 4U, 19" rack mountable steel frame, 500R8 lends it self perfectly to mobile recording setups. We designed the rack-ears of the 500R8 to support three different orientations that allow 500R8 to be protected in a number of applications. You can recess 500R8 into its rack ears to protect the front panel controls during travel; you can also take those same rack ears and re-orientate them to become a carry handle.

As with all Cranborne Audio equipment, 500R8 is designed, engineered and manufactured in the UK to ensure that every product that leaves our UK factory has met our stringent test routines and will provide years of trouble-free, and dependable service.