The IP211 module is used in a number of our products.

* as the middle input section of the Ark8 console
* two of these modules are used in the EQ 2.2 and EQ 2.2-VU
* eight of these modules are used in the EQ 8-R
* an Inductor EQ only version is used in the NDUCR
* the same Inductor EQ design is used in our Iridium (500 module)

IP211 is designed to add colour to your signal.
It has 4 EQ sections, which can be combined on the same signal path or can be used independent from each other on either the small fader or large fader signal path.

Like all Ark8 modules, the IP211 can have Silver or Black faceplate.

Hi-Cut filter (also called Low-Pass filter)
As it’s name implies, the Hi-Cut filter cuts off the high frequencies.
It sweeps over 5 octaves from 16 KHz
down to 500 Hz
Our Hi-Cut filter can be used on the A or B signal path,
and separate or in combination with the other EQ sections.

Lo-Cut filter (also called Hi-Pass filter)
As it’s name implies, the Lo-Cut filter cuts off the low frequencies.
It sweeps over 5 octaves from 25 Hz
up to 800 Hz
Our Lo-Cut filter can be used on the A or B signal path,
and separate or in combination with the other EQ sections.

4-band inductor EQ

Inductor based circuits are the “holy grail” of equaliser designs.
These were used for example in the much favoured Pultec equaliser design,
which dates back to the late 1950’s.
Owing to their unique electro-mechanical properties,
inductors impart a character all of their own, which is very distinctive.

Our inductor EQ uses inductors in each of the four bands
(unlike other so-called inductor EQ’s on the market),
giving precise control and the distinctive inductor sound on each band.

As a consequence of using inductors, this provides a “peaking” characteristic,
giving much tighter control of the frequency selected.

The inductor values and components have been carefully chosen and matched
to provide an extremely musical sound.

Each band provides switch selection of any of six carefully selected frequencies
chosen at musically pleasing intervals.
Each band uses a fader - instead of a rotary potmeter - for cut and boost control,
allowing a maximum of plus or minus 15dB per band.

Our 4-band inductor EQ can be used on the A or B signal path,
separate or in combination with the other EQ sections.

Why faders instead of rotary controls ?
Simply, just because we like faders.
But also, because faders give much better visual control of the level of cut or boost, so you know what’s going on at a glance.

Four bands with switchable,
overlapping frequencies

- Low (Hz): 50, 80, 100, 150, 300, 600
- Low Mid : 125, 250, 500, 1K, 2K, 4K
- Hi Mid (kHz): 1.5, 3, 5, 6, 7, 8
- High (kHz): 8, 9, 10, 12, 14, 16

Swing EQ
Our Swing EQ is a fast and easy way to make a track sound “warmer” or “cooler”.
By turning the one-control-knob counterclockwise, you attenuate the highs and boost the lows, making the sound darker. By turning the one-control-knob clockwise, you attenuate the lows and boost the highs, making the sound brighter or cooler. Our Swing EQ can be used on the A or B signal path, separate or in combination with the other EQ sections.

All four sections of the IP211 can be used independently from each other, on either of the signal paths, or can be combined for “extreme” EQ-ing.

What are Inductors ?

Inductors are wires wound around a coil that provide a form of frequency-dependant resistance. When they saturate, they bring out beautifully musical harmonics that give your tracks the silky-smooth, polished sound that has made classic consoles and equipment so desirable for over sixty years. This is what makes them different from capacitor-based EQ designs, which do a great job at surgical equalisation. But it has always been up to Inductors to provide the tone.

While some of the inductors we use are off-the-shelf, we also use custom inductors. This attention to detail in controlling variables such as the winding and core materials in relation to the surrounding circuitry allows our Inductor EQ’s to capture the classic sound, while at the same time be up to todays standards in sound-quality and noise level.

Below are some short movies of the EQ 2.2 (VU)
and a movie of the EQ 2.2’s big brother - the EQ 8.
These units feature the IP211 module.
EQ sections and routing on the IP211, EQ 2.2 and EQ 8 are the same, so either movie should give you a good idea.

EQ 8 movie

Piano and Bass - Bohemian Rapsody

Having some fun with the Ark Console

Featuring the IP211 module

This website is about the Ark Console.
main Interphase Audio website has all information about our other products.