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EQ550P | PASSIVE VALVE 2 BANDS EQ

$289.00 ex. VAT

Fully Assembled and Tested

Mix and Match HRK 500 Products!

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

Categories: 500 Products, Equalizers

EQ550P | Passive Valve Two Bands Equalizer

Inspired by Famous Valve Passive EQ
Hybrid Tube Class A Gain Stage
Two Bands Shelf EQ Operation
Separate Control for Boost and Cut
3 Frequency Settings for HF Band
3 Frequency Settings for LF Band
Vintage NOS Discrete Components
Output Coupled with Custom HRK Transformer
Class A Discrete Output Transformer Driver
NOS GE Military Grade USA Made Tube
On-Board Voltage 500 Rack PSU Filters
Direct Sale – Save on Distributors Fee!

The EQ550P is a Passive Tube-based 2 Band Shelf Equaliser inspired by the famous Pultec design.

Each Band has a separate Boost and Cut Control which allows creating the sophisticated EQ curves.

Each Boost or Cut control has three different and independent frequency settings which give a total of 9 setting combinations per Band.

The Passive filter section changes the EQ curve by attenuating the signal. The Tube gain stage restores the signal to the nominal level adding the combination of harmonics and transients.

The EQ550P is very musical and easy to use. It can process any music material, instruments, vocal or recordings, producing amazing results.

The Valve – Discrete Transistors Hybrid circuit is the result of a long development process. It produces real Tube harmonics and reaches tone while maintaining the noise on an extremely low level.

Create Sophisticated EQ Curves!

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.

Standard Cut and Boost 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.

Previous

Next

Basic Demo Video

Kick Drum Demo Video

Links:

DIYRE EQP5 Passive Equalizer vs EQ550P Valve Passive Equalizer – Comparison Page ->

Brand New, Assembled and Tested.

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

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 Countries	– 9.99USD for orders below 249USD – FREE shipping for orders over 249USD	NO Customs Fees	– Yes, for personal orders – Not charged with the EU VAT number
United Kingdom	– 9.99USD for orders below 249USD – FREE shipping for orders over 249USD	NO Customs Fees	No VAT charge. HMRC collects the VAT.
USA, Canada	– 9.99USD for orders below 249USD – FREE shipping for orders over 249USD	NO Customs Fees for orders up to 800USD – charged by the USA Customs Office	No VAT charge.
Australia	– 14.99USD for orders below 349USD – FREE shipping for orders over 349USD	No info available – refer to local regulations.	No VAT charge.
Switzerland	– 9.99USD for orders below 249USD – FREE shipping for orders over 249USD	No info available – refer to local regulations.	No VAT charge.
Norway	– 9.99USD for orders below 249USD – FREE shipping for orders over 249USD	No info available – refer to local regulations.	No VAT charge.
Russia, Ukraine, Belarus	– 19.99USD for orders below 349USD – FREE shipping for orders over 349USD	No info available – refer to local regulations.	No VAT charge.
Worldwide destinations	– 24.99USD for orders below 399USD – FREE shipping for orders over 399USD	Refer to local regulations.	No VAT charge.

VAT and Customs Fees

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

Custom Fees for EU Customers will not be charged.

VAT is removed automatically for orders from outside the EU.

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

EU Business 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.

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.

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

Payment Options:

You can pay for your order with any Credit Card!

No account is needed.

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.

#barthrk

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Mar 23

#selling a bunch of #recording #gear. Got some cool #analog #hardware #processors and a killer #interface. It’s all listed on #portlandoregon #yamhill county #craigslist, but you can dm if interested.
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#pdxmusic #recordingstudio #forsale #recordingengineer

#selling a bunch of #recording #gear. Got some cool #analog #hardware #processors and a killer #interface. It’s all listed on #portlandoregon #yamhill county #craigslist, but you can dm if interested.
#bereich03density
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#pdxmusic #recordingstudio #forsale #recordingengineer ...

40 0

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Aug 30

#dione! #ng500

#Repost kuttstudios
・・・
STILL MY FAVORITE PLUGINS 😁😁😁😆
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#dione! #ng500

#Repost kuttstudios
・・・
STILL MY FAVORITE PLUGINS 😁😁😁😆
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid ...

220 2

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Apr 20

Mastering a beautiful EP for the GOAT sammymellman Gorgeous harmonies and arrangements on these wonderful songs. Using a pair of #barthrk EQ550s and an #audioscapebusscompressor to get things sittin pretty.

Mastering a beautiful EP for the GOAT sammymellman Gorgeous harmonies and arrangements on these wonderful songs. Using a pair of #barthrk EQ550s and an #audioscapebusscompressor to get things sittin pretty. ...

36 7

View

Jun 10

⁣
⁣⁣
⁣#repost kuttstudios⁣
⁣__________________⁣
⁣⁣
⁣ACUSTICA AUDIO IS KILLIN IT!!! MASSIVE SOUNDING PLUGINS... 🔥🔥🔥🔥🔥🤘🤘🤘🤘🤘⁣
⁣#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #avid #protools

⁣
⁣⁣
⁣#repost kuttstudios⁣
⁣__________________⁣
⁣⁣
⁣ACUSTICA AUDIO IS KILLIN IT!!! MASSIVE SOUNDING PLUGINS... 🔥🔥🔥🔥🔥🤘🤘🤘🤘🤘⁣
⁣#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #avid #protools ...

343 8

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Sep 9

The new mobile production set up is happening. The home studio can now travel offsite !Feeling excited for the fall studio residency. #dbx560a #dbx530 #barthrk #radialsixpack #mobilerecordingstudio #ur44 #500series #cloudlifter #cloudliftercl1

The new mobile production set up is happening. The home studio can now travel offsite !Feeling excited for the fall studio residency. #dbx560a #dbx530 #barthrk #radialsixpack #mobilerecordingstudio #ur44 #500series #cloudlifter #cloudliftercl1 ...

53 2

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Mar 4

⠀ #repost kuttstudios⠀ • • •⠀ THIS #acusticaaudio NAVY EQ IS TO THIS DAY THE CLOSEST I'VE HEARD A PLUGIN GET TO ANALOG... KEEP UP THE GREAT WORK!!! #antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #diyre #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio

⠀ #repost kuttstudios⠀ • • •⠀ THIS #acusticaaudio NAVY EQ IS TO THIS DAY THE CLOSEST I'VE HEARD A PLUGIN GET TO ANALOG... KEEP UP THE GREAT WORK!!! #antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #diyre #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio ...

201 5

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May 24

HRK modules are now available!⁣
⁣Thank you Bart!!! And thanks to Mike for connecting us.⁣
⁣https://barthrk.eu/ ⁣
⁣Compressors, equalizers, saturation processors, summing mixers…⁣
⁣⁣
⁣#sessionrecall #audiosoftware #recordingstudios #masteringengineer #masteringstudio #masteringstudios #analoggear #studiosessions #recordingstudio #recallsheet #recallsheets #gearporn #studiogear #audiopro #studiosession #studiogears #studiorack #studioporn #mixandmaster #mixingandmastering #500series #barthrk

HRK modules are now available!⁣
⁣Thank you Bart!!! And thanks to Mike for connecting us.⁣
⁣https://barthrk.eu/ ⁣
⁣Compressors, equalizers, saturation processors, summing mixers…⁣
⁣⁣
⁣#sessionrecall #audiosoftware #recordingstudios #masteringengineer #masteringstudio #masteringstudios #analoggear #studiosessions #recordingstudio #recallsheet #recallsheets #gearporn #studiogear #audiopro #studiosession #studiogears #studiorack #studioporn #mixandmaster #mixingandmastering #500series #barthrk ...

41 1

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Mar 6

_DIONE!
#Repost kuttstudios
• • • • •
DONE!!! (FOR NOW) 😂😂😂😂😂 LOVE THIS WORKFLOW OF HYBRID MIXING & MASTERING...
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #diyre #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #soundtoys

_DIONE!
#Repost kuttstudios
• • • • •
DONE!!! (FOR NOW) 😂😂😂😂😂 LOVE THIS WORKFLOW OF HYBRID MIXING & MASTERING...
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #diyre #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #soundtoys ...

252 4

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Sep 15

#500series #lindellaudio #barthrk #dbx

#500series #lindellaudio #barthrk #dbx ...

30 0

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Aug 16

STILL MY FAVORITE PLUGINS 😁😁😁😆
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer

STILL MY FAVORITE PLUGINS 😁😁😁😆
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer ...

79 12

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Jun 10

This little guy arrived today. Cinemag transformer I can run audio through using #barthrk 500 series modules and shape the sound a little.

#musicformedia #audioproduction #musicstudio #musicforfilmandtv

This little guy arrived today. Cinemag transformer I can run audio through using #barthrk 500 series modules and shape the sound a little.

#musicformedia #audioproduction #musicstudio #musicforfilmandtv ...

10 1

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Apr 18

IT'S BEEN A WHILE... HAD TO TIDY THINGS UP A BIT...
"HOME SETUP"

#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #protools #avid #mixing #recording #producer #audioproduction

IT'S BEEN A WHILE... HAD TO TIDY THINGS UP A BIT...
"HOME SETUP"

#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #protools #avid #mixing #recording #producer #audioproduction ...

56 5

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Oct 9

Fully operational!
#allenandheath
#solidstatelogic
#weissklang
#neumannmicrophones
#flickinger
#barthrk
#bereich03
#lindellaudio
#analogrecording

Fully operational!
#allenandheath
#solidstatelogic
#weissklang
#neumannmicrophones
#flickinger
#barthrk
#bereich03
#lindellaudio
#analogrecording ...

35 1

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Sep 29

COZY LITTLE LIVE ROOM....
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording

COZY LITTLE LIVE ROOM....
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording ...

39 0

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Apr 13

After a nice family day and a weekend of visiting Kendrick, a late production session on another new single was a nice touch. #indigenousartist #cubasepro10 #radialengineering #yorkville #sansampbassdriver #cloudliftercl1 #ur44 #barthrk

After a nice family day and a weekend of visiting Kendrick, a late production session on another new single was a nice touch. #indigenousartist #cubasepro10 #radialengineering #yorkville #sansampbassdriver #cloudliftercl1 #ur44 #barthrk ...

27 4

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Sep 9

OH IM LOVIN' THIS!!!!!!! acusticaaudio YOU GUYS ARE PURE GENIUSES!!!
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer

OH IM LOVIN' THIS!!!!!!! acusticaaudio YOU GUYS ARE PURE GENIUSES!!!
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer ...

41 9

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May 24

modules modules modules...

#alphaaudiolabs #barthrk #colourmodule

modules modules modules...

#alphaaudiolabs #barthrk #colourmodule ...

13 0

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Sep 21

GREAT SESSION WORK WITH THESE GUYS!!!
#jawarisafari #gweeds334 #gbshamaxrecords #antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid

GREAT SESSION WORK WITH THESE GUYS!!!
#jawarisafari #gweeds334 #gbshamaxrecords #antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid ...

30 1

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Aug 9

the art of the bodge #prototype

the art of the bodge #prototype ...

24 1

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Nov 10

PART 2 OF THE HOME STUDIO RECONFIGURE....
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer

PART 2 OF THE HOME STUDIO RECONFIGURE....
#antelopaudio #purpleaudio #ssl #warmaudio #aphexaudio #inwardconnections #rupertnevedesigns #yamaha #music #musiclife #audioengineer #recordingengineer #mixingengineer #recordingstudio #mixingstudio #tridentaudio #heritageaudio #igsaudio #wesaudio #bart_hrk #chameleonlabs #acusticaaudio #dakingaudio #wavesaudio #eventideaudio #protools #avid #mixing #recording #producer ...

46 6

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