US$286
- Mix & Match HRK 500 Products!
| 500 Units | 2 | 4 | 6+ |
| Discount | -10% | -15% | -20% |
- Free Shipping for Orders $299+
- Handmade in HRK Workshop
- Fully Assembled and Tested
- Express Delivery to Europe │ USA │ UK │ Canada
- Fully Featured Diode Bridge Compressor
- similar design to Neve's 2254, 2264, 33609
- Adds complex Harmonics and analog warmth
- enhances the sound stage and track content
- Easy-to-Use for beginners
- professional studio editing tool
- Threshold from -25dB to +20dB
- Ratio from 1.5:1 to 8:1
- Fast Attack from 250uS to 100mS
- Recovery from 50mS to 2.5S
- up to +20dB Gain Make-Up
- Side-Chain 150Hz HPF
- Gain reduction meter
- Stereo Coupling Option
- Carefully selected high-Quality components
- Coupled with HRK Active Transformer
- Soft-Start 500 Rack PSU Filters
- Direct Sale - Save on Distributors Fee!
Introducing the CP554: A Modern Take on Classic Diode Bridge Compression.
The CP554 is a feature-rich diode bridge compressor that offers a clear tonal response when not operated in vintage mode, providing you with the freedom to maintain sonic clarity when desired.
Incorporating diode bridge circuitry as the gain reduction element adds a touch of harmonic coloration, a characteristic that can enhance your sound and introduce
CP554 employs the specially developed adaptive HRK soft-knee characteristic, created by B. Hrk. This intuitive feature simplifies the use of the compressor, making it accessible to users of all experience levels.
With its user-friendly design, even beginners can produce professional-grade results. The versatile HRK soft-knee curve is impressively musical and adapts seamlessly to a diverse range of music genres and signal types, granting you exceptional flexibility in shaping your sound.
In Vintage Mode, the HRK Custom Analog Circuitry (not a DSP) replicates harmonics closely resembling those generated by the transformers and circuits of classic vintage diode bridge compressors like the Neve 2254, 2264, 33609. This attribute gives you access to analog warmth and character at the flip of a switch.
CP554 is not a clone of any well-known diode bridge compressor. The design of the CP554 is based on engineering principles similar to which were incorporated in the classic or vintage equipment.
The CP554, designed and constructed using traditional methods, offers an authentic analog experience, embodying the golden era of audio processing.
CP554 | Diode Bridge Compressor Introduction and Demo
Video by Adam Steel. For more content visit https://youtube.com/@adamsteelproducer
CP554 vs. NEVE 2254, 2264, 33609
The CP554 is based on the same principles of operation as the NEVE 2254, 2264 and 33609.
All the above compressors use the Diode Bridge as a circuit which controls the level of the signal.
CP554, however, is based on modern components and produces a lot less self-noise compared to vintage NEVE designs. Which means that CP554 is better suited for stereo-bus applications.
Furthermore, CP554 in a default mode produces a far more neutral tonal response and if the NEVE-like character is required, the Vintage Mode can be engaged to add extra transformer harmonics to the signal, providing more flexibility for various studio applications.
Why Are Diode Bridge Compressors So Expensive?
The market filled with a multitude of studio-grade compressors, with VCA, FET, and opto-compressors being the most prevalent. In contrast, diode bridge compressors are comparatively rare and expensive, with limited options primarily comprised of AMS-Neve units based on Rupert Neve’s original designs, such as the 2254, 2264, and 33609 stereo compressors.
While some manufacturers attempt to create Neve clones using accessible original diagrams, it is crucial to note that even the most precise clone cannot replicate the original Neve, as the sole source of transformers today is Carnhill, which manufactures transformers based on the original Marinair’s specification, providing only substitutes for Marinair transformers used in classic Neve’s units.
Utilizing a diode-bridge element as the gain control block necessitates a particularly designed circuitry, where the ideal signal symmetry is of utmost importance. In the 60s, only transformers could deliver this perfect signal symmetry.
Traditional diode-bridge compressors are also known for their heightened noise floor. An inadequately designed circuitry can drastically amplify the noise, making the compressor unsuitable for studio applications.
Reproducing Neve’s compressors may be feasible, but it does not guarantee high-quality results. A profound understanding of diode-bridge compressor design is the true key to success.
The CP554 stands apart from mere clones. It is meticulously designed to adhere to the principles of diode-bridge circuitry while striving to achieve optimal performance. CP554 delivers an unparalleled sonic experience, bridging the gap between rarity and excellence for discerning audio enthusiasts.
Experience the Classic Sound of Transformers Delivered by Advanced Technology
Discover the tone of vintage transformers merged with contemporary innovation in the CP554 Diode Bridge Compressor. While the classic diode bridge compressors designed by Rupert Neve extensively utilized transformers, their application was largely dictated by the technological constraints of the 60s and 70s.
Transformers were, at the time, the sole devices capable of performing specific functions in professional audio circuitry, such as impedance matching, level reduction or amplification, and signal transformation from balanced to unbalanced, or vice versa.
The CP554, however, is engineered with modern electronic components, transcending these limitations. While it adheres to the traditional diode-bridge compressor design principles, it is neither a copy nor a clone of any vintage unit. The extensive use of transformers in the diode bridge is no longer a necessity.
Transformers can now be substituted with state-of-the-art electronic components, resulting in superior signal-to-noise ratio and enhanced immunity to electromagnetic interferences. These advancements maintain the cherished sound quality of vintage units while capitalizing on contemporary technology.
In its default mode, the CP554 offers a subtle infusion of harmonics produced by the diode-bridge circuitry. This approach ensures that the device remains neutral and non-destructive to the musical material, providing an unparalleled balance of sonic nostalgia and modern-day innovation.
CP554 | Diode Bridge Compressor Overview
The CP554 Vintage Mode Experience
Introducing Vintage Mode, a proprietary circuitry designed by Bart Hrk that brings the enchanting harmonics of classic diode bridge compressors to life through analog processing circuitry. This fully analog design (no DSP) is rooted in an in-depth understanding of the performance, response, and operation of traditional analog circuitry.
Vintage Mode is the culmination of extensive knowledge of transformers and vintage circuitry, coupled with vast experience in analog circuitry design. This potent combination allows us to faithfully reproduce the distinctive performance, character, and vibe of vintage analog circuitry and transformers. After all, electronic engineering is science, not magic!
The Vintage Mode circuitry promises a response akin to that of vintage transformers, where more signals yield more harmonics. The resultant sonic experience mirrors that delivered by vintage units, complete with their unique frequency and tonal responses.
By default, the CP554 is a neutral and versatile tool. It does not impose any strong character on the musical material, significantly expanding its applicability in studio and music production settings. However, when required, the activation of Vintage Mode introduces classic harmonics, transforming the CP554 into a Vintage Diode Bridge Compressor.
With CP554, you’re investing in a dual-purpose tool, an epitome of modern versatility and vintage charm combined. This 2-in-1 design ensures you have the right sonic character for any situation, making it an invaluable addition to your audio production arsenal.
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 CP554
*The Stereo Link cable is provided together with a pair of the CP554.
CP554 | Diode Bridge Compressor vs. DAW Plugins
HRK Active Transformer
Bart Hrk has developed a proprietary design for an Active Transformer, aimed at addressing the limitations of traditional passive transformers.
Traditional passive transformers are known to be vulnerable to electromagnetic interference, such as 50/60Hz hum and HF RF smog. Additionally, their frequency response is contingent upon load and source impedance, which adversely affects the overall performance of analog studio equipment.
The HRK Active Transformer is a game changer that not only resolves the issues associated with passive transformers but also retains and amplifies the desired characteristics of the transformer output stage. This includes the enrichment of harmonic content and the enhancement of tonal response.
What sets the HRK Active Transformer apart is its ability to deliver the rich, beloved sound that audio enthusiasts seek, including the harmonic content and tonal response, while simultaneously eliminating the drawbacks of passive transformers.
Furthermore, the Active Transformer introduces a delicate “Air” effect and boasts an extended low-frequency (LF) performance, adding depth and clarity to the sound.
Another remarkable feature of the Active Transformer is its dynamic saturation, which is dependent on the output level. As the output signal level increases, the Active Transformer exhibits greater saturation, reminiscent of the warm and rich sound produced by classic studio equipment.
In summary, the HRK Active Transformer is an innovative solution that offers superior sound quality, eliminates electromagnetic interference, and enhances harmonic content and tonal response. It is an invaluable asset for professionals and audiophiles seeking to elevate their audio experience.
CP554 | Diode Bridge Compressor vs. Dione VCA Compressor
CP554 Specification
| General | ||
| Input Type / Input Impedance | Balanced Electronic | 20k |
| Output Type / Output Impedance | Balanced HRK Active Transformer | Less than 10R |
| Max Output Level | +25dBu@0.1%THD with 1k Load | * Balanced Signal |
| Recommended Load | Balanced 10k | Minimum Supported Load 600R |
| Initial Gain | 0dB | Gain Make-up set to 0dB |
| Phase Reverse | No | CP554 is not introducing phase reverse in any mode of operation. |
| Frequency Response | 5Hz-80kHz@-1dBr | Compressor disengaged. |
| Static Noise Level | -95dBu@10Hz-22kHz | Compressor 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 | Diode-Bridge Symmetric Gain Cell | |
| Compression Curve | Adaptive Soft-Knee | Depends on the Threshold and Ratio knob settings |
| Threshold Range | -25dB / + 20dB | Smooth Continues Potentiometer |
| Ratio Range | 1.5:1 - 8:1 | Smooth Continues Potentiometer |
| Attack Time | 250uS - 100mS | Smooth Continues Potentiometer |
| Recovery Time | 50mS - 2.5S | Smooth Continues Potentiometer |
| Side Chain HPF | 150Hz@6dB/oct | Use the HPF Switch |
| Frequency Response | 5Hz-30kHz@-1dBr | Compressor engaged. |
The input signal should be connected to the rear XLR input.
It is recommended to use -12dBu 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.
USA and Canada
Orders from the USA below 800USD are FREE from customs tax.
We ship directly to the USA and Canada
Payment Options:
You can pay for your order with any Credit Card or Apple Pay!
PayPal – We do not use PayPal as a payment method.
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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