CP523V | CLASS A VALVE OPTOCOMPRESSOR

Fully Featured Valve Opto-Compressor
Discrete Tube Class A Gain Stage
NOS GE Military Grade USA Made Tube
Microprocessor True Level Gain Reduction Meter
Side-Chain 160Hz HPF
Threshold from -30dB to +10dB
Ratio from 1:1 to Limiter
Slow / Fast Attack Switch
Recovery from 50mS to 2S
+20dB Gain Make-Up
Stereo Coupling Option
Output Coupled with Custom HRK Transformer
Black/Red Pearl High Gloss Finish
On-Board Voltage 500 Rack PSU Filters
Direct Sale – Save on Distributors Fee!

Stereo Operation

Our improved production process ensures stereo matching between units.

If you purchase two units in one order, you can be sure that both units are matched for stereo operation, bus processing and mastering.

The CP523V is a Tube-based fully-featured optocompressor with a Class A gain make-up stage.The CP523V has separate controls for Threshold, compression Ratio, Recovery time, and Output Gain.The Attack time can be set with the switch to Fast or Slow. The Slow Attack is perfect for adding the edge to the drums or bass recording.The Sidechain High Pass Filter removes the low-frequency content from the processing greatly enhancing the capabilities of the CP523V for tracking and mastering.The CP523V is very musical and easy to use. It can process any music material, instruments, vocal, or recordings, delivering amazing results. The Valve – Discrete Transistors Hybrid circuit is the result of a long development process. It produces rich Tube harmonics and tone while maintaining the noise on an extremely low level.

Microprocessor TLGR Meter

The CP523V is equipped with Microprocessor True Level Gain Reduction Meter.This is a unique approach to provide the user with an ultra-accurate gain reduction reading. In most of the Compressors, the gain reduction is measured using the indirect method with an additional LDR circuit or by measuring the Side-chain voltage.The RVGR is based on a microcontroller that measures the actual level of the signal on the input of the CP523V and the signal level on the output of the compressor stage, in real-time.Two signal values are compared and the value of the signal reduction is calculated over 400 times every second. The results are averaged and displayed using the Gain Reduction LED Meter.The typical error of the meter is less than -0.5dB in -1dB to -8dB gain reduction range.

CP523V Valve Class A Optocompressor TLGR Meter Demo

https://youtu.be/-_aLbUSGi84Video shows how accurate the microprocessor True Level Gain Reduction is when compared to the professional lab test equipment.

NOS Military Grade Tube

The CP523V Gain Makeup Stage is made with NOS USA Made Military Grade 6U8A tube, which delivers superb specification matching and much longer operating time compared to a standard nowadays made valves.

Create Amazing Results!

The CP523V is easy to use even for engineers with less experience with dynamic processors.Optocompressors are very versatile and produce smooth compression results. Any music material will benefit from the magic touch added by the CP523V.The sidechain controls are simple and powerful providing the necessary tools for many demanding studio applications.

Add Harmonics to your Recordings or Tracks

The CP523V is suitable for recording as a part of the signal path.It will control the dynamics of the signal from the microphone while enhancing the details and structure of the vocal or the instruments. The CP523V can be used for tracking or mastering. Two units can be paired in stereo mode. The Slow Attack mode and the side-chain High Pass Filter can be used very creative way in mastering applications.

Stereo Mode

A pair of CP523V will work in a stereo mode. Two units can be coupled with a special link cable added for free if two CP523V units are purchased.If you purchasing a second CP523V unit simply add the request for the link cable in the information section during the checkout.The cable will be added to your order for free. The matched CP523V pair is also available as a separate item on this website. More information about how to use CP523V in stereo mode can be found in the User Manual.

CP523V Stereo Bus Mix Demo – 96k HD Audio – Ratio: Medium

Attack: Slow, Sidechain HPF Engaged, Threshold: 0dB

https://hrkshop.eu/wp-content/uploads/CP523V-Bus-Stereo-Mix-Demo.mp4All DAW Tracks are sent to the same line output bus, processed/mixed with the CP523V.The DAW tracks were mixed in the DAW with no additional processing.

Stereo Mix Samples from the Video – 96k Wave Files

CP523V Settings – Attack: Slow, Sidechain HPF Engaged, Threshold: 0dB

DAW Mixdown - DRY

CP523V Mixdown - Mild Compression

CP523V Mixdown - Medium Compression

CP523V Mixdown - Soft Limit

Stereo Male Vocal HD Samples – 96k Wave Files

CP523V Settings – Attack: Slow, Sidechain HPF Engaged, Threshold: 0dB

Male Vocal DAW - DRY

Male Vocal - Mild Compression

Male Vocal - Medium Compression

Male Vocal - Soft Limit

Stereo Drums HD Samples – 96k Wave Files

CP523V Settings – Attack: Slow, Sidechain HPF Engaged, Threshold: 0dB

Drums DAW - DRY

Drums - Mild Compression

Drums - Medium Compression

Drums - Soft Limit

Demo Videos

Clips below show the old silver plate version of the CP523V. The balck front panel version has the same sonic performance.

Female Vocal Demo

https://hrkshop.eu/wp-content/uploads/CP523V-Fem-Vox-Demo-1.mp4

Drums Demo

https://hrkshop.eu/wp-content/uploads/CP523V-Drums-Demo.mp4

DI Acoustic Guitar Demo

https://hrkshop.eu/wp-content/uploads/CP523V-Acc-Git-Demo.mp4

Brand New, Assembled and Tested.

Every single HRK product is carefully tested with Audio Precision test equipment before shipping to ensure hassle-free operation

We are testing every product according to strict test procedures.

The User Manuals for HRK products are available on this page ->

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

Country / Region	Shipping Cost	Customs Fee	VAT
All 27 European Union CountriesDelivery Time: 2-7 Days	– 9.99USD 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 KingdomDelivery Time: 3-7 Days	– 9.99USD for orders below 299USD- FREE shipping for orders over 299USD	NO Customs Fees	No VAT charge. HMRC collects the VAT.
USA, CanadaDelivery Time: 5-10 Days	– 9.99USD 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.
AustraliaDelivery Time: 5-14 Days	– 14.99USD for orders below 399USD- FREE shipping for orders over 399USD	No info available – refer to local regulations.	No VAT charge.
SwitzerlandDelivery Time: 3-7 Days	– 9.99USD for orders below 299USD- FREE shipping for orders over 299USD	No info available – refer to local regulations.	No VAT charge.
NorwayDelivery Time: 3-7 Days	– 9.99USD for orders below 299USD- FREE shipping for orders over 299USD	No info available – refer to local regulations.	No VAT charge.
Russia, Ukraine, BelarusDelivery Time: 5-10 Days	– 19.99USD for orders below 399USD- FREE shipping for orders over 399USD	No info available – refer to local regulations.	No VAT charge.
Worldwide destinationsDelivery Time: 3-14 Days	– 24.99USD for orders below 499USD- FREE shipping for orders over 499USD	Refer to local regulations.	No VAT charge.

VAT and Customs Fees

VAT is removed automatically for orders from outside the EU.

USA and Canada

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

EU Customers

If you have the EU VAT number, you can purchase the products available in the HRK Shop with no 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 non-business orders from the EU, the VAT will be added at the checkout. Custom Fees for EU Customers will not be charged.

Non-EU Customers

Customers from outside the EU can 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.

Payment Options:

You can pay for your order with any Credit Card!

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.

500 Units	2	4	6
Discount	-10%	-15%	-20%

FREE Shipping for orders over 299USD!

CP523V | VALVE OPTOCOMPRESSOR

CP523V | CLASS A VALVE OPTOCOMPRESSOR

Stereo Operation

Our improved production process ensures stereo matching between units.

If you purchase two units in one order, you can be sure that both units are matched for stereo operation, bus processing and mastering.

Microprocessor TLGR Meter

CP523V Valve Class A Optocompressor TLGR Meter Demo

NOS Military Grade Tube

Create Amazing Results!

Add Harmonics to your Recordings or Tracks

Stereo Mode

CP523V Stereo Bus Mix Demo – 96k HD Audio – Ratio: Medium

Stereo Mix Samples from the Video – 96k Wave Files

Stereo Male Vocal HD Samples – 96k Wave Files

Stereo Drums HD Samples – 96k Wave Files

Demo Videos

Female Vocal Demo

Drums Demo

DI Acoustic Guitar Demo

Brand New, Assembled and Tested.

We are testing every product according to strict test procedures.

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

VAT and Customs Fees

USA and Canada

EU Customers

Non-EU Customers

Payment Options:

7 Days Return Policy

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