C533 Analog Saturation Colour Processor

$189.00 ex. VAT

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Product Description

C533 | Analog Saturation Colour Processor with TILT EQ

  • Add Analog Saturation to your Music!
  • Series Operation with Drive/Cut Knobs
  • LF/HF TILT EQ with MID Dip Mode
  • 3 Colour Modules Slots
  • 1:1 Ratio Gain/Trim Colour Drive Circuit
  • +20dB Colour Drive Gain Range
  • Bypass Switch for Each Colour Modules
  • -12dB Active Input Signal Attenuation
  • High-Quality ALPS Potentiometers
  • Studio-Grade Low Noise Opamps
  • Balanced Input
  • Balanced Output
  • Compatible with DIYRE Colour Format
  • Direct Sale – Save on Distributors Fee!

The C533 is a Mono Series Saturation Processor with three Colour Module slots, designed to process the sound with the use of Colour Modules adding subtle harmonics to the signal, similar to the harmonics added by the vintage studio equipment.

Each Saturation Colour Module stage has Drive/Trim circuit with 1:1 Ratio potentiometer. As a result, the colour module drive level increases while the output level remains the same.

-12dB Active Input Signal Attenuation feature reduces the input signal level without adding any extra noise usually associated with the passive input attenuators.

Each Colour Module stage has the Bypass Switch which allows the easy A/B operation. The LED indicates the active Saturation Module.

The Smart Tilt EQ

The C533 Smart Tilt EQ is a special type of the shelf EQ which can boost / cut the LF or HF using only one knob.

The Smart Tilt EQ is based around the passive EQ filter circuit.

Turn the knob right to increase the amount of HF while reducing the amount of the LH band.

Turn the knob to the left to emphasize the low end while reducing the amount of HF.

The Smart Tilt EQ has the MID DIP feature which attenuates the Mid Band by -4dB@1.5kHz greatly increasing the functionality of the EQ.

The EQ section can be bypassed for easy A/B comparison.

C533 Signal Flow Diagram

The picture below shows the simplified signal flow diagram for C533 Processor. It is important to understand how C533 operates. Please read the User Manual before using the C533. Click the picture to enlarge.

-12dB Active Input Signal Attenuation

The C533 has the active signal attenuation feature which reduces the input signal by -12dB without adding any noise.

The typical passive attenuators may add extra noise due to the use of additional resistors on the input.

Passive attenuators may also change the input impedance if engaged, changing the frequency response of the signal source.

The C533 Active Attenuation Circuit eliminates all problems associated with the passive counterparts.

The noise has ultra-low levels and the input impedance stays the same even if the signal attenuation is engaged.

Active Low Noise Colour Drive Circuit

The C533 has an active Gain Control Circuit. The first half of the Gain/Trim Dual Potentiometer is actively changing the Drive Gain.

Less Drive = less Gain, which means less noise in the background.

C533 will always deliver the lowest possible noise floor level.

The C533 was designed from the beginning to be used by professionals in demanding studio applications.

HRK Colour Modules – True Analog Plugins!

Colour Modules are Hardware Analogue Plugins made with NOS Discrete Components and Valves which add pleasing harmonics and subtle saturation to the signal, delivering the sonic results of the Vintage Studio Equipment for a fraction of the Price!

Each Colour Module is different and uniquely impacts the sound. You can use the Colour Modules for Recording, Tracking and Mastering.

Demo Video

Louder Than Liftoff Mister Focus vs HRK C533 – Comparison Table

LTL Mister Focus HRK C533
Number of Colour Modules 2 3
Front Panel Attenuation Switch NO YES -12dB
Drive Range -6db / + 18dB 0 / +20dB
EQ Type Tilt EQ Tilt EQ with MID DIP Feature
Input Electronic Balanced Electronic Balanced
Output Electronic Balanced Electronic Balanced

DIYRE Colour 500-Series Palette mkII vs C533 Saturation Colour Processor – Comparison Table

  DIYRE Colour Palette mkII HRK C533
DRIVE RANGE 0 – 18 dB 0 – 20dB
NOISE PERFORMANCE INFO NOT PROVIDED -90dBu Noise Flor – no colour modules

The C533 is fully compatible with the DIYRE Colour Format and The DIYRE Colour Modules. All DIYRE Colour Modules are compatible with the C533.

User Manual:

Please read the User Manual before the use of the C533.

C533 User Manual ->


The Main FAQ Section

Read more about the Colour Modules Idea – Colour FAQ Section


Brand New, Assembled and Tested.

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


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

We offer Fast & Free Worldwide UPS shipping with tracking.

FREE delivery is available for orders over the 249USD to EU, USA and Canada.

Total cart value / Delivery cost:

up to 99USD / Delivery Cost – 19.99USD

99 – 148USD / Delivery Cost – 14.99USD

149 – 248USD / Delivery Cost – 9.99USD

over 249USD – FREE Delivery

FREE delivery is available for orders over the 299USD to Australia, New Zeland, Japan and other destinations.

Total cart value / Delivery cost:

up to 148USD / Delivery Cost – 19.99USD

149 – 298USD / Delivery Cost – 14.99USD

over 299USD – FREE Delivery

Please check the shipping cost during the checkout.

Delivery to other WorldWide destinations – 24.99USD

VAT and Customs Fees

For non-business orders from the EU, the VAT will be added at the checkout.

VAT is removed automatically for orders from outside the EU.

No Custom Fees for EU Customers.

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

EU Business Customers

If you have the EU VAT number you can purchase the products available in the Bart 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.

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 custom invoice will be issued.

Orders from the USA below 800USD are customs tax-free.

Payment Options:

You can pay for your order with any Credit Card!

Return Policy

Our return policy is a part of the general Terms & Condition which you have to 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 do provide such option. However, because we are a small company we can’t afford to run a grade B outlet shop like big distributors and provide 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, 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 and if you wish to return the item we will accept the return request, providing that the item is not damaged and we can resell the product with the minimal loss for the company.

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


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