Due to the Valves Shortage, only a few EQ550P are available.
Stock will be updated based on availability.
6 in stock
6 in stock
The unique feature of Passive Equalizer is the ability to Cut and Boost at the same time.
The EQ550P can create sophisticated EQ curves which cannot be achieved by the active shelf equalizers.
The ability to select three different frequencies independently for Cut and Boost provides countless possibilities in creating custom EQ curves.
The plots below show a few examples of such EQ curves.
Like any other equalizer, the EQ550P can be used to cut or boost the shelf frequencies.
The plots below show the maximum cut and boost for each band and frequency settings.
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.
The demo video presenting the older version of the EQ550P with a Silver front panels.
The current Black front panel version is delivers the same performance as the units presented in the video.
All videos are server hosted to insure the best quality of sound without the YouTube compression or normalization.
|Input Type / Input Impedance||Balanced Electronic||20k|
|Output Type / Output Impedance||Balanced HRK Active Transformer||Less than 10R|
|Initial Gain||0dB||All controls set to flat response|
|Max Output Level||+25dBu@1%THD||Balanced Signal|
|Power Consumption||180mA max.|
|Format||API 500 Format|
|Phase Reverse||No||0 deg.|
|Static Noise||-89dBu@10Hz-22kHz||All controls set to flat response|
|Thermionic Valve||NOS Dual Triode||High Quality NOS Selected Tube|
All HRK Products are tested with the industry best audio measuring equipment
|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 Customs Fees||No VAT charge. HMRC collects the VAT.|
|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 Delivery Time: 5-14 Days||– 19.99USD for orders below 399USD- FREE shipping for orders over 399USD||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||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||No info available – refer to local regulations.||No VAT charge.|
|Russia, Ukraine, Belarus – NOT AVAILABLE||NOT AVAILABLE||NOT AVAILABLE||NOT AVAILABLE|
|Worldwide destinations Delivery Time: 3-14 Days||– 29.99USD||Refer to local regulations.||No VAT charge.|
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.
We ship directly to United Kingdom.
UK VAT tax is collected by HRMC
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.
Orders from the USA below 800USD are FREE from customs tax.
We ship directly to USA and Canada
You can pay for your order with any Credit Card and Apple Pay!
If the item is damaged during the transport, we will do our best to help you and provide the replacement product.