| Content | The Shelford Channel is built around Rupert Neve’s first new transformer-gain, class-A microphone preamplifier in over 40 years, a “best-of-the-classics” inductor EQ section, a tone-packed diode bridge compressor, the power of variable Silk saturation, a new dual-tap transformer output stage, and twice the operating voltage of vintage designs.
The Input Stage and Transformer Gain Mic Pre
Like Rupert’s designs from his time in Little Shelford , the Shelford Channel’s preamplifier uses a directly-coupled transformer input with gain provided by the custom transformer itself – a first in over 40 years for Rupert Neve. This new custom-designed input transformer, along with its careful integration with the surrounding class-A circuitry, is critical to the Channel’s bold and instantly recognizable character.
Conveniently, the Direct Input uses the same topology as the best-selling RNDI Active Transformer Direct Interface, providing astonishing clarity for high-Z instrument signals, with unparalleled low-frequency response and an incredibly smooth high end.
What is Silk?
The Silk & Texture circuit on the Shelford Channel allows you to fine-tune the amount (and type) of harmonic content in the output stage. This means your signal can be adjusted from quite transparent to settings that produce nearly 10x the amount of sonic color as Rupert’s vintage modules – and in two very unique modes. No matter what sound you’re looking for, Silk can help get you there.
The Dual Tap Transformer Output
Complementing the Silk circuit is the custom-designed output transformer, which uses Rupert Neve Designs’ unique dual-tap output topology. This offers both full-headroom (+26dBu) and -6dB outputs, allowing the engineer to drive the unit fully into classic transformer saturation without clipping converters and other devices later in the chain.
The “Best-Of” EQ
The Shelford Channel’s 3-band, custom-tapped inductor EQ was inspired by our favorite elements of Rupert’s vintage EQ designs. The low frequency band is designed to produce a creamy, resonant bass response similar to a vintage 1064 – but unlike the vintage modules, the LF band on the Shelford Channel can be used as either a shelf or a peak filter, adding punch, dimension, and control to your low end.
The midrange band is based on that of the 1073, ideal for sweetening vocals and instruments while bringing them forward in a mix, and its proportional “Q” response makes it well-suited for minimizing problematic frequencies. The high frequency band is a hybrid vintage / modern design, blending inductor circuitry with capacitor-based topologies to achieve vintage tones with enhanced control, with the shelf / peak corner switchable between 8K or 16K.
The Diode Bridge Compressor
Like the Inductor EQ and Transformer Gain microphone preamp, the Diode Bridge Compressor in the Shelford Channel is based on the same topologies found in Rupert’s vintage designs – but refined & adapted for the modern engineer.
What is diode bridge compression? Where the VCA compressor found in the Master Buss Processor provides unmatched clarity, the weighty, harmonically rich tonality of diode bridge compression can be essential in pushing key sources like vocals, electric guitars, bass and drums to the forefront of a mix.
By understanding the limitations of vintage units like the legendary 2254, painstaking effort was taken to reproduce the unique tone of these classics while improving the noise floor & accuracy, expanding inflexible time constants, adding full wave sidechain detection for improved dynamic response, and widening the range of threshold and ratio controls.
Delivering the powerful sound of these iconic designs with enhanced flexibility for the modern age, the Shelford’s diode bridge compressor is a dynamic tool equipped to make a statement on virtually any mix or track.
MIC PREAMP
INPUT IMPEDANCE
2200 Ohm
MAXIMUM INPUT
- +21.5 dBu from 150 Hz to 22 kHz
- +8 dBu 20 Hz to 22 kHz
NOISE
- Un-weighted, 22 Hz-22 kHz, source impedance 150 Ohm balanced.
- Main Out @ unity gain -100.9 dBu
- -6 dB Out @ unity gain -106.6 dBu
- +30 dB gain (Main Out) -91.37 dBu
- +66 dB Gain (Main Out) -64.1 dBu
- Equivalent Input Noise -121.37 dBu
FREQUENCY RESPONSE
+/-0.25 dB from 17 Hz to 45 kHz
DIRECT INPUT
MAXIMUM INPUT
8 dBu @ 20 Hz to 120 kHz
NOISE (MAIN OUTPUT)
-100 dBu (22 Hz to 22 kHz)
LINE INPUT
MAXIMUM INPUT LEVEL
+30.5 dBu 20 Hz to 30 kHz
TOTAL HARMONIC DISTORTION AND NOISE
- @ 1 kHz, +20 dBu output level, no load: Better than 0.002%
- @ 20 Hz, +20 dBu output level, no load: 0.05% Typical (2nd and 3rd harmonic)
NOISE (MAIN OUTPUT)
Un-weighted, 22 Hz - 22 kHz, source impedance 40 Ohm balanced, no load.
-101.1 dBu
FREQUENCY RESPONSE
+/- 0.25 dBu from less than 10 Hz to 110 kHz
-0.32 dB @ 120 kHz
MAXIMUM OUTPUT LEVEL
+26 dBu @ 16 Hz to 20 kHz
TOTAL HARMONIC DISTORTION AND NOISE WITH SILK ENGAGED
RED
- MIN TEXTURE @ 100 Hz, +20 dBu input level, no load: 0.0131%, mostly 3rd harmonic (typical)
- MAX TEXTURE @ 100 Hz, +20 dBu input level, no load: 1.66%, mostly 2rd harmonic (typical)
BLUE
- MIN TEXTURE @ 100Hz, +20 dBu input level, no load: 0.0079%, mostly 3rd harmonic (typical)
- MAX TEXTURE @ 100Hz, +20 dBu input level, no load: 0.941%, mostly 2rd harmonic (typical)
HIGH PASS FILTER
- Continuously variable swept frequency from 20 Hz to 250 Hz.
- Slope: 12 dB/Octave
EQ NOISE
Un-weighted, 22 Hz-22 kHz: -92 dBu
SIGNAL PRESENT
Illuminates GREEN when input stage signal level reaches -20 dBu
OVERLOAD INDICATOR
Illuminates RED when input stage signal level reaches -23 dBu
DIODE BRIDGE COMPRESSOR
- NOISE (BW 22 Hz – 22 kHz)
- 0 dB Makeup Gain: -84.5 dBu
- +20 dB Makeup Gain: -64.2 dBu
TIME CONSTANTS
- Measurements taken represent full range achievable between 1.5:1 Ratio and 8:1 Ratio setting.
- 0 dBu I/P 1kHz Burst Tone used for all recorded measurements.
- Fast (TC1): Attack 180µS — 1.8mS // Release 100mS – 150mS
- MedFast (TC2): Attack 750µS – 5.25mS // Release 160mS – 250mS
- Med (TC3): 2.7mS – 18mS // Release 350mS – 525mS
- MedSlow (TC4): 4.6mS – 38mS // Release 600mS – 1 S
- Slow (TC5): 11mS – 72.5mS // Release 800mS – 1.25 S
- Auto (TC6): 5.75mS – 35.5mS // Release T1 400mS – 850mS, T2 TBD
- “Fast” Mode Multiplier: Modifies aforementioned TC’s by 70% of original value
PRODUCT DIMENSIONS
19” (48.3 cm) x 10.5” (26.7 cm) x 1.75” (4.4 cm) | Effective against boredom, supporting creative sound design
A unique team play of spring reverberation, analogue multimode filtering, distortion and VCA, modulated by an ultra fast LFO and an envelope that can be triggered in flexible ways – Retroverb Lancet offers a comprehensive arsenal of many-sided effects for different applications. The spectrum by far surpasses classic reverberation, filter sweeps or overdrive because you are able to tweak and bend any parameter fast and intuitively to your liking.
Retroverb Lancet will change the way you work with effects. It becomes part of your sound engine, fires it up and will end up as essential part of your sonic signature.
Source of effectiveness
We designed Retroverb Lancet in a way that it can perfectly handle signals of any kind: Guitars, basses, synthesizers, organs or microphones. On top of that, Retroverb Lancet allows you to create percussive sounds using its crash function.
Retroverb Lancet is a real jack of all trades with character, suited for adventurous sound designers and tinkerers.
Audio Input
- max. input sensitivity: –32 dBu
- impedance: 1 MΩ
Output
- max. output level: 20 dBu
- impedance: 600 Ω
Trigger- and CV-inputs
- audio trigger
- max. input sensitivity: –32 dBu
- impedance: 1 MΩ
- gate & CRASH
- external cv
Signal-to-Noise Ratio
- direct: > 80 dB
- effect (filter completely open, no reverb): > 75 dB
Spring Tank
- number of springs: 3
- reverbration decay: between 2.75 db and 4.00 s
Filter
- modes: 24-db-lowpass, 24-db-highpass, 12-db-bandpass
- modulations sources: envelope generator, envelope follower, external CV, LFO
LFO
- frequency range: 0.05 Hz … 300 Hz
- waveforms: ramp up, ramp down, square, sine, S&H, envelope generator
Envelope Generator
- modes: AD, ASR
- attack: 1 ms … 10 s
- decay/release: 1 ms … 15 s
Miscellaneous
- power supply: external DC-adapter with 12 V/1000 mA
- dimensions: 26 cm x 14.5 cm x 8 cm (width x depth x height)
- weight: 0.75 kg
Accessories
| Originally developed for the dynamics circuit of the acclaimed Shelford Channel, the 535 Diode Bridge Compressor captures the soul of Rupert Neve’s original 2254 compressor while providing modern updates including advanced timing control, significantly lower noise, fully stepped controls throughout, and internal parallel processing capabilities.
What is diode bridge compression?
Where the VCA compressor found in the Master Buss Processor provides unmatched clarity, the weighty, harmonically rich tonality of diode bridge compression can be essential in pushing key sources like vocals, electric guitars, bass and drums to the forefront of a mix.
By understanding the limitations of vintage units like the legendary 2254, painstaking effort was taken to reproduce the unique tone of these classics while improving the noise floor & accuracy, expanding inflexible time constants, adding full wave sidechain detection for improved dynamic response, and widening the range of threshold and ratio controls.
Delivering the powerful sound of these iconic designs with enhanced flexibility for the modern age, the 535 Diode Bridge Compressor is a dynamic tool equipped to make a bold statement on virtually any mix or track.
LINE INPUT TO LINE OUTPUT
- Compressor Bypassed.
- Z source = 40 Ohm Balanced
INPUT IMPEDANCE
10K Ohm
OUTPUT IMPEDANCE
40 Ohm
MAXIMUM INPUT LEVEL
+23.5 dBu
MAXIMUM OUTPUT LEVEL
+23.5 dBu
NOISE
- 22 Hz - 22 kHz BW.
- -101 dBu
FREQUENCY RESPONSE
- 10 Hz - 120 kHz, 30ft Output XLR Cable.
- +/- 0.25 dB
THD+N
- @ 1 kHz @ Maximum Output Level, 22 Hz - 22 kHz BW.
- 0.001%
| Condition: Item is subject to minor cosmetic imperfections. Packaging may be in poor shape. The item displayed in the images may not be the actual item you receive.
- Converts balanced line level signals to unbalanced
- Stereo signal path with set & forget level control
- Transformer isolated to eliminate hum & buzz
- J-Iso features Jensen™ transformers for optimal signal path
The Radial J-Iso and Pro-Iso are stereo line isolators designed to convert a professional +4dB line level balanced signal to an unbalanced -10dB consumer level device. This enables you to take the balanced output of a mixer and feed a consumer level recorder or audio input on a computer.
J-Iso Part # R800-1025: The J-Iso employs a premium Jensen transformer for optimal signal transfer to minimize distortion and artefact. Full bandwidth performance makes the J-Iso ideal for music production.
The passive design begins with 100% discrete components throughout. A set & forget level control lets you attenuate the input signal to prevent it from overloading the destination device. Output connections include a stereo pair of ¼" connectors, a set of RCAs and a mini 3.5mm (1/8") for interfacing to a mini recorder or lap-top computer. Transformer isolation helps eliminate hum and buzz caused by ground loops while eliminating stray DC currents from flowing.
Construction begins with 14 gauge steel throughout utilizing Radial's unique bookend construction. This creates a protective zone around the connectors and controls for added durability. The steel construction also assists by shielding the transformers from outside magnetic fields. Inside, the J-Iso features an innovative I-beam skeletal insert that makes it virtually impossible to torque the PC board. This reduces potential stress which could cause premature solder joint failure.
Designed for full range applications, the J-Iso combines exceptional signal handling with the type of durability that has made Radial famous. Signal Processors |
The Cranborne Audio 500R8 is, essentially, a studio in a rack. It’s an 8-slot high-current 500 Series chassis, a 28-in/30-out USB interface, an analog summing mixer, a zero-latency artist mixer, and a monitor controller — everything you need to build your dream hybrid analog/digital studio. The 500R8 is fitted with high-performance AD-DA conversion, reference-grade headphone amplifiers, a reference-quality master clock, and more. In fact, there’s very little you can’t do with the Cranborne Audio 500R8. Configure it to suit your preferred analog flavoring for any source. Pack it with vintage-style 500 Series preamps for recording drums; clean, pristine preamps for vocals; and EQ, compression, and saturation modules when it’s time for mixdown.
USB audio interface
Connect the 500R8 directly to your Mac or PC via USB and utilize the 500R8’s onboard 28-in/30-out USB audio interface for recording and playback directly to and from your digital audio workstation of choice.
Discrete summing mixer
Give your mix the crowning touch of analog character by sending submixes and stems back through your 500 Series modules, into the 500R8’s discrete analog summing mixer, and back into your DAW.
Monitor controller
Use the 500R8’s onboard high-headroom monitor controller to switch between two sets of speakers, toggle mono sum, mute, dim, and talkback facilities while monitoring the peak level of your mix on the high-resolution 28-segment LED meter.
 Shown with optional 500 Series modules
Audiophile headphone amps and zero-latency artist mixer
Drive any headphones with 500R8’s two reference-grade headphone amplifiers — they have enough power to drive low-impedance ’phones with gobs of headroom and a linear frequency response to below 1Hz! Use the 500R8’s two aux buses to create pristine analog cue mixes that you can blend with DAW playback and send to the talent with zero latency.
World-class conversion and clocking
For the musician who wants to get down to business, it may be hard to get excited about conversion and clocking. But engineers at Sweetwater get to check out the best of them — and we’re amped about these converters. They’re touted as best-in-class and flaunt truly impressive specs such as under .5 picoseconds of jitter. But none of that really matters when you hear the fullness of your stereo image bloom with jaw-dropping sonic clarity.
Connect the 500R8 to your macOS or Windows computer and capture every nuance of your sources with reference-grade AD/DA conversion and world-class internal clocking. Effortlessly pass audio between analog and digital worlds without the digital artifacts that color, cloud, and degrade your recordings. The only coloration you will hear is intentional — your microphone placements, mixing decisions, and the 500 Series modules you’ve chosen to use. And with word clock I/O, you can even share the 500R8’s world-class clocking with the rest of your digital gear.
Ample I/O and configurable front end
The 500R8 has generous I/O to integrate with all of your analog and digital hardware, so you can mix and match your 500 Series modules and find the best combinations during recording and mixing to help create your own signature analog sound. You can even integrate your 19" rack units via the 500R8 s dedicated per-slot TRS insert jacks.
C.A.S.T. away
Spec’d with Cranborne’s innovative C.A.S.T. system, the 500R8 does away with excess cable spaghetti, delivering a cost-effective, low-maintenance, plug-and-play solution by transmitting four channels of balanced analog audio over shielded Cat 5 Ethernet cable directly to the destination of your choice.
Handy source select
Re-patch your 500R8 at a flick of a switch. Dedicated source select switches for each 500 Series slot adjusts signal routing to send analog, C.A.S.T., or USB sources through each of your modules. Unused 500 Series slots? Bypass them using the 500R8’s dedicated slot-bypass switch.
 Shown with optional modules and Cranborne 500ADAT
Expandable, in the studio or on the road
When you’re ready for additional 500 Series connectivity, connect your 500R8 with Cranborne Audio’s 500ADAT via ADAT for 16 channels of 500 Series modules. Housed in a 19" 4U rack-mountable rugged steel frame, the 500R8 makes an ideal 500 Series chassis for mobile recording setups. Packed with cool, useful features, the Cranborne Audio 500R8 is one of the more innovative pieces of pro audio gear we’ve seen at Sweetwater. Trust us — you will be impressed.
Cranborne Audio 500R8 8-slot 500 Series Chassis and USB Audio Interface Features:
- 28-in/30-out USB interface, summing mixer, artist mixer, and monitor controller
- Low-latency USB 2.0 interface:
- Compatible with macOS and Windows computers
- ADAT I/O (16x16 channels @ 44.1/48kHz, 8x8 channels @ 88.2/96kHz)
- S/PDIF I/O; 5-pin MIDI I/O
- High-performance A/D conversion:
- Dynamic range: 121dB A-weighted dynamic range, 20Hz–20kHz
- Frequency response: 2.2Hz to >80kHz (-1dB)
- 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, 20Hz–20kHz
- Frequency response: <1Hz to >61kHz (-1dB)
- THD+N: <0.0003% (-110.5dB) @ -4dBFS, 20Hz–40kHz (1kHz, A-weighted)
- Max Output Level: +24dBu
- Reference-quality internal master clock:
- Sample rates: 44.1, 48, 88.2, 96, 176.4, and 192kHz; <0.5ps jitter
- Dedicated word clock I/O 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
- Analog summing mixer:
- 8x2 analog summing mixer with +26.5dBu of headroom and dedicated ADC
- Balanced 1/4" jack outputs
- C.A.S.T. link port for increasing Summing Mixer to 16x2 using Cranborne Audio 500ADAT
- Zero-latency Artist Mixer:
- Analog Artist Mixer with per-channel physical level/pan controls and DAW return blend controls
- 2 high-power headphone outputs with independent blend and level controls
- Reference-grade headphone amplifier:
- THD+N: <0.0006% (-104.4dB) @ 20dBu, 1kHz A-weighted, 300 ohm 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: <1Hz to >70kHz (1dB)
- High-current 8-slot 500 Series rack:
- Per-slot current: 250mA , 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 Analog, USB or external C.A.S.T. signals through 500 Series modules
- Per-slot module bypass switches allowing 500R8 to be used without 500 Series modules installed
- C.A.S.T. compatible:
- C.A.S.T. ports per channel for routing analog I/O using passive or active C.A.S.T. breakout boxes via standard Cat 5 cable
- External power supply:
- 24V, 5A external locking power supply for improved analog audio performance and heat dissipation
- Designed and engineered in the UK:
- Each 500R8 is extensively tested by a team of dedicated engineers to ensure reliability and consistency.
| The product that started it all for Empirical Labs. Born of founder Dave Derr’s love of classic compressors like the 1176, LA-2A and Gain Brain (among others), the Distressor incorporates his favorite sonic characteristics of these, along with other unique and interesting features that have made it a staple for audio engineers all over the world. With over 28,000 units in the field, it’s safe to say that the Distressor is one of the best selling high end compressors of all time… if not THE best selling. A prominent recording engineer recently wagered that there probably was not a top 40 record made in the last five years that didn’t have at least one Distressor on it.
Besides providing a wide range of control and a unique feature set, the Distressor offers a warm, vintage sound by using a custom designed gain control circuit. This “warmth” or “vintage sound” has become a major issue in the last few decades, as the super clear and linear digital technology does next to nothing to soften “harsh” sounds, nor emphasize the bass frequencies in music sources. Conversely, older analog tape, vinyl records and tube equipment could not be prevented from coloring the sound, often to the frustration of recording engineers. However, many people now realize that this coloring can be extremely pleasant and musical. Digital technology is often referred to as “cold” and “brittle” among other terms (although we prefer “unforgiving”).
Unique Compression Curves
All eight of the Distressor’s curves are unique and distinctive, from the 1:1 mode that simply warms up signal with low order harmonics without intentional compression, to the “Nuke” setting – a brick wall limiting curve that shines on live drum room mics. Each curve has its own personality and several actually use different circuitry, and are effectively different compressors. Most exceptional is the 10:1 “Opto” ratio which uses separate detector circuitry to emulate the oldest (and valued) “light controlled” devices, such as the LA-2A.
Distortion (Color) Modes
Another large part of the Distressor’s personality and power derive from three modes that color the signal, even without compression. These extended audio modes were designed to allow emulation of some very old and expensive vintage compressors & limiters, and let the Distressor deliver a classic “knee” sound all its own by providing user programmable, warm harmonic distortion. In addition to the basic distortion mode, Distort 2 emphasizes tube-like 2nd order harmonics, while in Distort 3 setting the distortion becomes dominated by 3rd harmonics more closely resembling tape. Two HP filters – one in the audio path, one in the detector path – are also available to help with low frequencies that can cause pumping and breathing.
- Frequency Response – 2 Hz to 160 kHz in clean audio mode (+0, -3 dB). Response is shaped in distortion modes (Dist 2, Dist 3).
- Dynamic Range – 110 dB from max. output to min. output in 1:1 mode. Greater than 100 dB signal to noise in distort 3 mode.
- Distortion – ranges between .02% and 20% depending on distortion mode and release times set on front panel.
- I/O – DC Coupled input and outputs.
- Time Constants – Attack range 50uS – 50mS. Release range .05 sec to 3.5 seconds, normal modes and up to 20 seconds in 10:1 opto mode. Time constants are dependent on ratio.
- Power Consumption – 15 Watts Max.
- Metal Chassis – single height 1.75″ high, 10″ deep, 19″ wide.
- Shipping info – 12.1 lbs mono. Mono box dimensions 22.5″ x 18.5″ x 3 1/4″.
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