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- Mix & Match HRK 500 Products!
| 500 Units | 2 | 4 | 6+ |
| Discount | -10% | -15% | -20% |
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- Handmade in HRK Workshop
- Fully Assembled and Tested
- Express Delivery to Europe │ USA │ UK │ Canada
- Ultimate Proffesional Analog Studio Proccessing Tool
- Enhance Your Tracks and Mix with Analog Harmonics
- Upscale Your Mixing and Mastering Ability
- Create Top Rate Results Effortlessly
- Features HRK Solid State Drive Console Emulator
- Flexible Input and Output Level Controls
- Discrete Opamp Custom HRK VCA Compressor
- NOS Military Grade Transistors from '80s
- Easy to Apply Soft-Knee Compression Curve
- Post Compressor HF Auto-Enhance Feature
- Stereo Coupling Feature for Stereo Operation
- Four Band Ultrasmooth Equaliser
- Two Frequency Settings for Each EQ Band
- Musical and Intuitive EQ Filters Curves
- Augmented HRK Active Transformer Output
- Line Level Signal Processing
- High Headroom up to +25dBu
- Multiple Sources of Subtle Analog Harmonics
- Ear Picked Studio-Grade Low Noise Opamps
- Balanced Input and Output
- High-Quality Audio Potentiometers
- Compatible with API 500 Format
- Direct Sale - Save 30% on Distributors Fee!
CS566 | The Ultimate Analog Swiss-Army Tool for Your Recording Studio
The CS566 is a top-tier analog studio processor, designed specifically for professional music producers and audio engineers. It’s the result of an extensive development process, with each stage of its circuitry meticulously fine-tuned to deliver a standout performance.
One of the key features of the CS566 is its independent +/-12dB input and output level controls. These allow for precise matching of source signal levels and the sensitivity of subsequent studio hardware in the signal chain, giving you complete control over your sound.
The CS566 is equipped with a Custom HRK VCA compressor, reminiscent of the classic discrete VCA modules from the ’70s and ’80s. This compressor offers comprehensive control over signal dynamics, ensuring a smooth and seamless operational experience.
In a groundbreaking design move, the HRK Solid State Drive Console Emulator revolutionizes the approach to analog saturation and harmonic generation. This, along with a four-band equalizer with dual frequency settings for each band, provides you with an unparalleled level of sound customization.
The CS566 also features an enhanced HRK Active Transformer. This adds the final touch to your sound, injecting additional harmonics and shaping the frequency response to mimic the classic transformer output stage.
Despite its extensive capabilities, the CS566 remains compact and user-friendly. It’s a complete line level channel strip that houses all the essential tools you need for recording, tracking, and mastering.
With the CS566, you have everything you need to create professional-quality sound.
CS566 Ed Thorn Review
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Custom HRK VCA Compressor – Real Alternative
The SSL G-Series console master bus compressor is the quintessential compressor originally found in the large SSL studio mixing desks.
The pioneering design of the G-SSL compressor was grounded on the dbx discrete transistor VCA modules, identifiable by their distinct black, silver, and gold casing.
Regrettably, the majority – about 99% – of modern G-SSL compressors are designed with the same VCA Integrated Circuits manufactured by THAT Corp., instead of the discrete transistor VCA modules. The use of these integrated circuits is a cost-effective solution for mass production in the current market.
Consequently, all contemporary G-SSL units and variants are constructed using the same VCA-compressor integrated circuit.
HRK has developed a custom hybrid discrete version of the VCA block, fabricated with New-Old-Stock (NOS) Military Grade transistors from the ’80s. The HRK design isn’t a replication of the dbx module, but rather a proprietary design by Bart Hrk.
Each CS566 VCA compressor is hand-assembled using these NOS military-grade transistors from the ’80s. They bear similarities to the original dbx modules found in the vintage SSL compressors, which were also composed of discrete transistors.
As a result, the HRK VCA Compressor delivers a tonal quality akin to that of the iconic compressors of the ’80s, thanks to its custom design and authentic NOS discrete transistors.
CS566 Overview Video
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Solid State Drive | Console Emulator
The HRK Solid State Drive is a studio console emulator that generates distinct harmonics typical of a large format mixing desk. This proprietary design concept was innovatively developed by Bart Hrk.
The Solid State Drive is far from a conventional overdrive or saturation circuit found in most analog saturation studio equipment. Its design stands unique and distinctively apart from popular products in the market.
Harmonics produced by the Console Emulator block are smooth and subtle, yet noticeably present. The Console Emulator maintains the integrity of the soundtrack, ensuring the intended character is not obscured or compromised.
The Solid State Drive is the culmination of a lengthy development process, aiming to replicate the experience of a studio recording console.
For optimal results in tracking, mastering, or any other studio application, it is recommended to use the Solid State Drive and the VCA Compressor in tandem.
CS566 vs SSL SiX Channel | Comparison
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HRK Blue EQ | Four-Band, Smooth, and Musical Equalizer
The CS566 features a four-band, ultra-smooth Blue EQ equalizer. Each band provides two selectable frequency settings and a boost/cut range of +/-12dB.
Every band is constructed around a separate operational amplifier, creating an independent circuit section. This arrangement minimizes undesirable interaction between the EQ bands.
The separation of equalizer bands significantly curbs the boost/cut interplay between bands and mitigates the cross-influence of EQ sections’ center frequencies.
Uniquely designed, the HRK Blue EQ is a non-invasive and smooth equalizer created specifically as a versatile sound editing tool. It maintains a respectful approach towards the original signal character, without imposing a harsh tonal shift.
The chosen frequencies cater to a wide range of studio applications. The high frequency (HF) and low frequency (LF) bands are shelf-type filters, engineered for easy adjustment with gentle, musical curves.
The mid-low (ML) and mid-high (MH) bands are bell-type filters, delivering progressive and smooth characteristics. They offer signal correction without pitch-ringing, even at higher boost levels.
The Blue EQ is a transparent equalizer, providing substantial processing capabilities while remaining intuitive and user-friendly.
With the HRK Blue EQ, you simply can’t go wrong!
Augmented HRK Active Transformer
The Augmented Active Transformer generates greater saturation and harmonics compared to a standard Active Transformer, making it a fitting choice for the final stage of the CS566 Channel Strip.
Bart Hrk pioneered a proprietary design for an Active Transformer to counter the challenges associated with common passive transformers.
Passive transformers often face susceptibility to electromagnetic interferences, such as 50Hz Hum and RF Smog. Additionally, their frequency response hinges on load and source impedance, which can detrimentally affect the overall performance of analog studio equipment.
In contrast, the HRK Active Transformer produces authentic sound, including the harmonic content and tonal response of an audio transformer, while eliminating all the issues associated typically with passive transformers.
The Active Transformer subtly creates an “Air” effect and ensures extended low-frequency performance.
The saturation of the Active Transformer is determined by the output level. A higher output signal will cause the Active Transformer to saturate more, reminiscent of 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.
- Our improved production process ensures stereo matching between units
- If you purchase two units in one order, both units are matched for stereo operation, bus processing and mastering.
- Spcial stereo coupling link cable is supplied with every pair of CS566
*The Stereo Link cable is provided together with a pair of the CS566.
Compressors Comparison Video
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Customers Reviews
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CS566 Specification
| General | ||
| 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 |
| Compressor | ||
| 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.
| Equaliser | ||
| 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 |
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 tested with the industry’s best audio measuring equipment – The Audio Precision
Audio Precision is an industry leader in providing high-quality audio testing equipment. They are renowned for their test systems’ precision, reliability, and versatility.
When testing studio audio devices, Audio Precision’s equipment can assess parameters like frequency response, harmonic distortion, intermodulation distortion, phase response, signal-to-noise ratio, and cross talk. In-depth and accurate testing allows the identification of even the smallest issues in audio quality, enabling corrections and improvements that can significantly elevate the overall product quality.
In conclusion, using Audio Precision test equipment is an excellent way to ensure that all HRK products are performing at their best, meeting the standards required for the Professional Studio Applications.
Stereo Buss Operation
- Our improved production process ensures stereo matching between units
- If you purchase two units in one order, both units are matched for stereo operation, bus processing and mastering.
- Spcial stereo coupling link cable is supplied with every pair of 500 Compressors
All Items are dispatched from Poland in the European Union within 1-3 working days.
| Country / Region | Shipping Cost | Customs Fee | VAT |
| All 27 European Union Countries – Delivery Time: 2-7 Days | – 14.99USD for orders below 299USD – FREE shipping for orders over 299USD | NO 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 299USD | No VAT Charge | HMRC collects the VAT or additional Fees if applicable. |
| USA, Canada – Delivery Time: 5-10 Days | – 14.99USD for orders below 299USD – FREE shipping for orders over 299USD | NO Customs Fees for orders up to 800USD – charged by the USA Customs Office | No VAT charge. |
| Australia, Japan, South Korea – Delivery Time: 5-14 Days | – 19.99USD for orders below 299USD – FREE shipping for orders over 299USD | There is no 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 299USD | There is no 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 299USD | There is no info available – refer to local regulations. | No VAT charge. |
| Russia, Belarus – NOT AVAILABLE | NOT AVAILABLE | NOT AVAILABLE | NOT AVAILABLE |
| Worldwide Destination Delivery Time: 3-14 Days | – 29.99USD | Refer to local regulations. | No VAT charge. |
EU Customers
EU Customers will not pay any extra customs fees.
Business customers with a valid EU VAT number will not have to pay VAT tax.
Please enter your EU VAT Number at 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, VAT will be added at 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 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.
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Orders from the USA below 800USD are FREE from customs tax.
We ship directly to the USA and Canada
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7 Days Return Policy
If the item is damaged during transport, we will do our best to help you and provide a replacement product.
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