Cranborne Audio 500R8 USB Audio Interface, Summing Mixer, and 500 Series Rack

500R8 is the centrepiece to the modern studio. It's a 28-in/30-out USB audio interface that combines a 500 series rack and high-performance A/D-D/A conversion with all of the connectivity required in the modern professional or home studio.

500R8 features the studio essentials that you need to build your dream studio such as an 8-into-2 high-headroom analogue summing mixer, comprehensive monitor controller with talkback facilities, 16-in/16-out ADAT interface, as well as a zero-latency analogue artist mixer with reference-quality, high-powered headphone outputs.

The Best Of Analogue
By capitalising on the vast and ever growing 500 series market, you can configure your 500R8 to suit your tastes of analogue flavour. By installing your favourite 500 series modules into the 8 available 500 series slots, you can create your ultimate analogue front-end/preamp stage that can be multi-track recorded directly into your DAW.

Fill 500R8 full of vintage preamps for recording drums. Fill 500R8 full of clean and pristine preamps for recording strings. Fill 500R8 full of Preamp, EQ, and Compressor modules to create your own custom, analogue channel strips. The possibilities are endless and every 500R8 is unique to your sound. Integrating 500 series modules into your workflow doesn't stop after the recording. Dedicated module source switches for each 500 series slot allow you to send USB channels from your DAW, into 500R8, through the 8 installed 500 series modules, and back into your DAW for recording (with that analogue ‘mojo’ applied). Think of 500R8 as a bank of 8 external Analogue Plug-ins.

For a more hands-on, all-analogue approach to mixing, 500R8 also features an 8-into-2 high-headroom analogue summing mixer with dedicated level and pan controls that you can use to create your own high-headroom analogue mix before recording it back into your DAW using dedicated USB inputs 9/10.

The Best Of Digital
In order to capture every subtle nuance of your analogue signal, 500R8 features reference-class A/D-D/A conversion with 121dB (A-wtd) dynamic range and THD+N of <0.00032% (@ -4dBFS, 1kHz, A-wtd), all governed by 500R8’s master-reference grade internal clock with <0.5 picoseconds of jitter.

The combination of highly-accurate, low-jitter clocking and high-performance 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 analogue design and low noise floor.

USB Audio Interface
Cranborne Audio's USB 2.0 audio interface provides high channel-count and low-latency performance whilst being accepted by all PC/macOS devices with unparalleled stability and longevity. 500R8 is core audio compliant for macOS or features a lightweight control panel for Windows machines that absorbs as little CPU resources as possible to leave you with more power for plug-ins within your DAW session.

Plug 500R8 into your PC/macOS device and your DAW will see a full 28-in/30-out USB audio interface. 500R8 also includes a full complement of 5-pin MIDI I/O, ADAT I/O, Word Clock I/O via BNC, and S/PDIF I/O to ensure that all of your digital studio connectivity is covered.

Monitor Controller
500R8 features a comprehensive monitor controller with connectivity for two sets of studio monitors. As well as seamless speaker switching between both sets of studio monitors, there’s a Mono button that sums L-R channels to check for mono compatibility, a DIM switch that drops the speaker volume by 12dB for relaxed discussions during recordings, and a speaker mute switch for when you are tracking 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 C.A.S.T. and headphones outputs connected to the system. 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 500R8’s dedicated analogue level and pan controls beneath each module. 500R8's summing mixer also has a dedicated converter which can be used to record your stereo mix into your DAW on USB inputs 9/10 with a massive +24dBu of headroom.

Zero-Latency Artist Mixer
500R8 moves away from clunky "virtual" software mixers and gets your hands back onto the mix. By using 500R8’s high-headroom analogue summing mixer, you can create zero-latency, all-analogue mixes of live sources that can be blended with discrete USB playback paths and sent directly to the recording musicians via C.A.S.T. or the local headphone outputs.

C.A.S.T. Equipped
C.A.S.T. stands for Cat 5 Analogue Snake Transport and enables cost effective and organised cable management around your studio. C.A.S.T. repurposes off-the-shelf, shielded Cat 5e, Cat 6, and Cat 7 networking cables to transport 4 channels of balanced analogue audio over a single cable. 500R8 has 4 C.A.S.T. IN ports that allow you to connect C.A.S.T. enabled devices (such as the Cranborne Audio N22 and N22H) and relocate I/O wherever it is needed around the studio.

Connect mic/line sources into the C.A.S.T. breakout box and that signal travels through the Cat 5 cable and directly into the modules installed into 500R8. At the same time, the analogue mix created on 500R8 is sent through the same cable and into the connected breakout box. This allows for seamless analogue audio connectivity between the control room, live room, vocal booth, or the bedroom next door! C.A.S.T. is 100% analogue and requires no setup in order to operate. It can easily work at distances up to 100m when Cat 6 or Cat 7 cable is used and the complete studio cabling infrastructure costs a fraction of what an analogue multi core would cost. No setup. No latency. No fuss. And it sounds great.

Designed and Engineered in the UK
To ensure that every product bearing the Cranborne Audio name is worthy of studio environments big or small, every 500R8 is carefully assembled by a skilled workforce with immense attention to detail 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-D/A 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 I/O Level: +24dBu

• Master reference-quality internal clock
○ Capable of 44.1, 48, 88.2, 96, 176.4, 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 headphones 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: <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 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 the studio using passive or active C.A.S.T. breakout boxes via standard shielded Cat 5e, Cat 6, or Cat 7 cables.
○ Compatible with all Cranbore Audio C.A.S.T.-equipped devices including N22, N22H, Camden EC1, and Camden EC2.

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

• Designed and Engineered in the UK
○ Each and every 500R8 is extensively tested by a team of dedicated engineers to ensure reliability and consistency.

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