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Pultec EQP-1A Plugin by OverTone DSP
PTC-2A by OverTone DSP is a Virtual Effect Audio Plugin for macOS, Windows and Linux. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
System Requirements
Requires 32 or 64-bit Windows 7 or newer and a VST, VST3 or AAX compatible host application.
System Requirements
Requires Mac OS X 10.8 or newer and a VST, VST3, Audio Unit or AAX compatible host application.
System Requirements
Requires a 64-bit X11 compatible Linux distribution and a native Linux VST compatible host application.
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The PTC-2A is a vintage equalizer plug-in inspired by classic Pultec style hardware EQs. Separate boost and attenuate controls allow simultaneous low frequency boost and cut to shape the signature sound, while a transformer-coupled tube emulation further enhances the desirable vintage tone.


  • Smooth controls with no 'zipper noise' when adjusting the plug-in settings.
  • Separate Boost and Attenuate controls for simultaneous low frequency boost and cut, emulating the classic Pultec style 'Low-end trick'.
  • Physically Weighted Controls replicate the virtual 'feel' as well as the look of high quality rotary controls.
  • Analogue Filter Modelling algorithms recreate natural analogue filter curves, without requiring high sample rates or CPU intensive up-sampling, allowing more plug-in instances in a typical DAW.
  • Live resizable GUI for best use of available screen space and resolution.
  • Circular, Relative and Linear control modes for intuitive user interface operation*.
  • Adjustable output level trim.
  • Switchable output phase / polarity.
  • Download and try for free. Audio will fade out periodically in demo mode.

*In host applications which support circular control modes, the PTC-2A provides beautifully engineered circular and relative-circular adjustment options. Physical modelling ensures the rotary controls respond smoothly, accurately and predictably to circular mouse movement.

Latest User Reviews

Average user rating of 5.00 from 1 review

Reviewed By Brother Charles
February 6th, 2013

Let me briefly give you a quick run down on one of my very best-est, favorite-est 'secret ingredient' EQ plugins.

I really like this EQ. It's light on system resources and is just plumb attractive (in an ol' skool, knobby hardware kinda way). I really like the rich, dark blue color. The knobs match the period that the 'real' Pultec EQP-1A originates from, authentically.

It sounds GREAT too!

Smooth controls. Nicely sized. Sounds great. I honestly do get a strong perception of authentic, analogue quality from this plugin. OverTone have indeed developed a GREAT Pultec emulation with this jobbie.

I've been in the habit of adding this EQ to kick drum tracks, lately. Have you ever heard of the "Kick trick"? Some folks call it the "Low end trick". In a nutshell, you simply dial in a moderate lowend bandwidth (I typically use a value of 2), set the frequency to 60hz, set the boost knob at 11:00 or 12:00. Set the low cut to 11:00 or 12:00. On the high end side, set HF at 3Khz or 4Khz. Boost by 3 or 4 dB. Attenuate by equal number of decibels with the attenuation selector set at 5Khz.

Now listen to that kick drum. Whomp!

I often follow the PTC-2A with my trusty DDMF IIEQPro, and add a narrow, negative 3dB decrement at 120hz. This is a nice "Nashville" technique to keep a bass guitar better defined in a mix.

I've also been using this plugin on certain piano tracks. In particular, NI Upright Piano samples. By using some creative push/pull on the upper frequencies, the piano begins to hop vibrantly in the mix. I don't touch the piano's low end too much. Especially on this type of instrument, the PTC-2A adds very pleasant EQ; full of analogue-like character. Honest, kids - My ears really are tricked into thinking that there are tubes in my computer. *grin

I also own IKM's Pultec emulator and while I like it very much, I tend to reach for the OverTone just as often. These funny, Linux-based, bunch of programming laddios from England, have captured "something" - the essence, if you will - with the sound of this nice little pluggie that just seems to massage my eardrums better than many of the other more costly Pultec clones that are availble.

A faithful, to-be-had emulation of the legendary Pultec EQP-1A.

Available in 32bit & 64bit for both MAC and PC.

Priced fairly at £25

Read more reviews of various independent developers' products here.


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Comments & Discussion for OverTone DSP PTC-2A

Discussion: Active



6 July 2015 at 5:16pm

this is one of my favorite eq's. i don't really go after modeled eq's but man i really love this one. i use it all the time.

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