CS566 | Processing Channel Strip

$369.00 ex. VAT

This is the last batch of CS566 at the Promo Price.

500 Units246+


CS566 | Line level sTUDIO cHANNEL sTRIP

CS566 vs SSL SiX Channel | Comparison Video

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Custom HRK VCA Compressor – The New Legend

The SSL G-Series console master bus compressor was the iconic compressor used in large SSL studio mixing desks.

The original design of the G-SSL compressor was based on the dbx discrete transistors VCA modules, characteristic for their look of black, silver and gold box.

Unfortunately, 99% of currently made G-SSL compressors use the same VCA Integrated Circuits produced by the THAT Corp., not discrete transistors VCA modules. The use of the IC is cheaper to mass-produce compressors nowadays.

It means that all G-SSL new units and G-SSL variants are built using the same VCA-compressor integrated circuit.

HRK has developed the custom hybrid discrete version of the VCA block, made with NOS Military Grade transistors from the ’80s. The HRK design is not a copy of the dbx module but a Bart Hrk propitiatory design.

CS566 VCA compressor is handcrafted using New-Old-Stock military grade transistors made in the ’80s. Similar to the original dbx modules used in the vintage SSL compressors, which were made of discrete transistors.

As a result, the HRK VCA Compressor delivers a tone similar to the sound of the iconic classic compressors from the ’80s because of the custom design and genuine NOS discrete transistors.

Solid State Drive | Console Emulator

The HRK Solid State Drive is a Studio Console Emulator produces selected harmonics specific for a Large Format Mixing Desk, and it is a propitiatory design concept developed by Bart Hrk.

The Solid State Drive is not a typical overdrive or saturation circuit used in most of the analogue saturation studio gear. The design of the SSD is unique and completely different from the popular products.

Harmonics added by the Console Emulator block are smooth and subtle but quite audibly present at the same time. The Console Emulator will not obscure or damage the intended character of the soundtrack.

The Solid State Drive is a result of a long development process aimed at recreating the experience of the Studio Recording Console.

The Solid State Drive and the VCA Compressor should be used in conjunction to achieve great results for tracking, mastering or any other studio application.

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NOS Military Grade Transistors from ’80s

At the HRK, we work hard to deliver the best experience for our customers. The use of specific components has an immense impact on the sound of the studio equipment.

Modern clones of the classic recording equipment will never sound similar to the originals because the mass production process force manufacturers to use widely available and modern semiconductors. Those components are entirely different from parts used in the old studio devices.

We search and obtain hard to find and unique NOS components from no longer existing manufacturers to bring back the tone and mojo of the vintage analogue gear.

We can use custom selected NOS components to hand build each unit in a short production run. We are not constrained by the unavoidable mass-production rules which are inevitable for big equipment manufacturers.

The Transistors used in the CS566 VCA Compressor are genuine Military Grade and High-Quality silicon transistors. NOS transistors deliver the authentic tone of the ’80s, a bit dark and sweet at the same time.

HRK Blue EQ | Four Band Musical and Smooth Equaliser

The CS566 has a four-band ultra-smooth Blue EQ equaliser. Each band has two selectable frequency settings and a boost/cut range of +/-12dB.

Each band is built around a separate operational amplifier creating an independent circuit section, which reduces the adverse interaction between the EQ bands.

Equaliser band separation dramatically reduces the boost/cut influence between the bands and eliminates the interrelation of EQ sections centre frequencies.

The HRK Blue EQ is a non-destructive and smooth equaliser explicitly designed to create a flexible sound editing tool which will not impose an aggressive attitude and change the original character of the signal.

The frequencies are selected to cover most of the studio applications.
The HF and the LF are shelf-type filters with easy to dial-in musical and gentle curve aspects.

The ML and MH are bell-type filters with progressive and smooth characteristics, delivering the signal correction without the pitch-ringing even at higher boost levels.

The Blue EQ is a transparent equaliser that allows significant processing capabilities while intuitive and easy to use. You simply can’t go wrong using the HRK Blue EQ!

Augmented HRK Active Transformer

The Augmented Active Transformer produces more saturation and harmonics when compared with a standard Active Transformer.

It is why the Augmented Active Transformer is an option as the last stage of the CS566 Channel Strip.

Bart Hrk developed the propitiatory design of an Active Transformer to solve the problems of the common passive transformers.

Passive transformers are susceptible to electromagnetic interferences (50Hz Hum, RF Smog) and the frequency response dependents on load and source impedance, negatively influencing the overall performance of analogue studio equipment.

The HRK Active Transformer delivers the sound that we love, including the harmonics content and the tonal response, and removes all the hassles associated with passive transformers.

The Active Transformer produces a subtle “Air” effect and provides extended LF performance.

The Active Transfomer saturation depends on the output level. Higher output signal levels will saturate the Active Transfomer more, like in the classic studio equipment.

Stereo Buss Operation

The CS566 is designed for the stereo bus processing.

The VCA Compressor sections can be coupled with the supplied linking cable to control the stereo image of the processed signal.

*The Stereo Link cable is provided together with a pair of the CS566.

Customer Reviews

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CS566 vs SSL Channel SiX Features Comparison

 CS566SSL SiX 500*
Microphone PreamplifierNoYes
Line Level Control Range+/-12dB-3dB – +63dB
Line Input / High Z Input20kΩ / No High Z input10kΩ / 1MΩ
Output Level Control Range+/-12dB (The output level works as Gain Make-up)No Output Level Control
Output TypeHRK Active Transfomer  – BalancedNo transformer – Electronic Balanced
Line Level Initial Gain0dB-3dB
Max Output Level+25dBu@0.1%THD with 1k LoadNo Info
Recommended LoadBalanced 10k / Minimum Supported Load 600RNo Info
CompressorCompress / Ratio / Attack / Recovery / HPF / Type – Soft KneeThreshold control only / Type – Soft Knee
Equaliser4 Band EQ – 2 Frequencies per Band2 Band EQ – Fixed Frequencies – Shelf/Bell Switch
LED MeterNo MetersMic Preamp / Compressor
Static Noise Level-95dBu@10Hz-22kHzOnly the Mic Preamp EIN at a maximum gain is provided
CMMR95dB70dB – Line Input

* SSL SiX Specification Information Source – User Manual, SSL SiX Official Product Page

CS566 Specification

Input Type / Input Impedance Balanced Electronic 20k
Input Level Control Range +/-12dB
Output Type / Output Impedance Balanced HRK Active Transformer Less than 10R
Output Level Control Range +/-12dB (The output level works as Gain Make-up)
Initial Gain 0dB Input and Output Level Control set to 0dB
Max Output Level +25dBu@0.1%THD with 1k Load * Balanced Signal
Recommended Load Balanced 10k Minimum Supported Load 600R
Phase Reverse No CS566 is not introducing Phase reverse in any mode of operation.
Frequency Response 5Hz-80kHz@-1dBr Compressor and EQ disengaged.
Static Noise Level -95dBu@10Hz-22kHz Compressor and EQ disengaged.
Power Consumption Typically 45mA per unit 60mA max. per unit
Format API 500 Format Compatible with most of the 500 Racks
Type of Compressor Engine VCA coupled with Discrete Operational Amplifier
Compression Curve Adaptive Soft-Knee Threshold and Ratio depends on Compress Knob Setting (1)
Threshold Range -25dB / - 20dB
Ratio Range vs the Ratio Switch 2:1 - 3:1 / 4:1 - 6:1 Ratio switch changes the range of Compression ratio (2)
Attack Slow/Fast Switch 30mS/400uS The Attack Switch changes the attack time
Side Chain HPF 160Hz@6dB/oct Use the HPF Switch
Recovery Time 50mS - 2.5S
Phase Reverse No CS566 is not introducing Phase reverse in any mode of operation.
Frequency Response 5Hz-20kHz@-1dBr Compressor and EQ disengaged.
Static Noise Level -85dBu@10Hz-22kHz

1- The Compress knob controls the threshold and ratio of the compression. Turning the Compress knob toward MAX will increase compression ration and threshold.
2- The Ratio switch changes the range of the ration controlled by the Compress knob.
Number of Bands 4 Bands Independent Circuitry Section per Band
Frequencies per Band 2 Selected with Switch
Boost/Cut Range +/-12dB
HF 12kHz/8kHz Shelf
HM 4.8kHz/2.6kHz Bell
LM 1.2kHz/400Hz Bell
LF 80Hz/160Hz Shelf
Phase Reverse No CS566 is not introducing Phase reverse in any mode of operation.
Frequency Response 5Hz-80kHz@-1dBr Compressor and EQ disengaged.
Static Noise Level -90dBu@10Hz-22kHz
Additional Notes
The CS566 is a line-level channels strip. The CS566 is not equipped with a microphone preamplifier.

The input signal should be connected to the rear XLR input.

It is recommended to use -12dB input signal level initially and increase the level signal if required.

ALL HRK Products Are Brand New - Assembled and Fully Tested

All HRK Products are tested with the industry best audio measuring equipment

Audio Precision System

All Items are dispatched from Poland in the European Union within 1-3 working days.

Country / RegionShipping CostCustoms FeeVAT
All 27 European Union Countries Delivery Time: 2-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs Fees– Yes, for personal orders- Not charged with the EU VAT number
United Kingdom Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs FeesNo VAT charge. HMRC collects the VAT.
USA, Canada Delivery Time: 5-10 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNO Customs Fees for orders up to 800USD – charged by the USA Customs OfficeNo VAT charge.
Australia Delivery Time: 5-14 Days– 19.99USD for orders below 399USD- FREE shipping for orders over 399USDNo info available – refer to local regulations.No VAT charge.
Switzerland Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNo info available – refer to local regulations.No VAT charge.
Norway Delivery Time: 3-7 Days– 14.99USD for orders below 299USD- FREE shipping for orders over 299USDNo info available – refer to local regulations.No VAT charge.
Worldwide destinations Delivery Time: 3-14 Days– 29.99USDRefer to local regulations.No VAT charge.

EU Customers

The EU Customers will not pay any extra customs fees.

Business customers with valid EU VAT number will not pay the VAT tax.

Please enter your EU VAT Number at the checkout, and the VAT will be deducted from the Total Payment. The VAT number is automatically checked in the VIES database.

For personal orders from the EU, the VAT will be added at the checkout.

UK Custmers

We ship directly to United Kingdom.

UK VAT tax is collected by HRMC

Non-EU Customers

Customers from outside the EU purchase the items with no VAT.

Please select the destination country, and the VAT will be removed automatically.

If the VAT is not removed, please email customer service via the contact form, and a custom invoice will be issued.

USA and Canada

Orders from the USA below 800USD are FREE from customs tax.

We ship directly to USA and Canada

Payment Options:

You can pay for your order with any Credit Card and Apple Pay!

7 Days Return Policy

Our return policy is a part of the general Terms & Conditions, which you must acknowledge at the checkout. We stand for fair rules and a win-win approach.
We understand that our customers may wish to return the product, and we provide such an option.
However, because we are a small company, we can’t afford to run a grade B outlet shop like big distributors and providing the 30 days return period. We can’t also scrap every returned unit.
We could charge our customers more to offset the cost of the returns, and this is what major distributors do. Or we can keep our prices low and hope that our customers will appreciate our policy.
This is why we provide the 7 days test period after receiving the package with the ordered items. If you wish to return the item, we will accept the return request, providing that the item is not damaged.

If the item is damaged during the transport, we will do our best to help you and provide the replacement product.