Quad Image Enhancer

Studio One's Binaural Pan processor can widen, or narrow, an instrument's stereo image. Aside from making bigger sounds that fill out the stereo spread, it also has practical applications. For example, you can spread out a thick stereo synth pad, or a guitar feeding two cabs in stereo, by turning the width control clockwise from the center position. This opens up more room for vocals, kick, snare, bass, and other centered elements. Binaural Pan can also do the reverse-like narrowing a wide, stereo synth bass part to focus it more-by turning the Width control counter-clockwise from the center position.

For mastering, Binaural Pan can make mixes seem larger than life. However, it's not necessarily a one-size-fits-all-frequencies solution, because you might want to spread the highs as far as possible, but narrow the bass, and add only a little bit of spreading to the upper mids-so let's make ourselves a multiband image enhancer.

This Quad Image Enhancer FX Chain is ideal for mastering, as well as for working with individual instruments. Fig. 1 shows the modules. The Splitter splits the audio into four bands: Low (below 250 Hz), Low Mid (250 Hz - 1 kHz), Hi Mid (1 kHz - 4 kHz), and High (above 4 kHz). Each of these goes to a Binaural Pan to control the image, and a Mixtool to trim the level (-6 dB to +6 dB).

Figure 1: Modules used in the Quad Image Enhancer multipreset.

The split frequencies are arbitrary. You might want to move them around, although the ones in the default multipreset work well with a variety of music.

The Control Panel (Fig. 2) accesses all the needed parameters. Enabling the Mono button is like turning Width fully counter-clockwise, but being able to switch this provides a convenient diagnostic tool for quickly comparing a band's sound in stereo or mono. Similarly, enabling Bypass makes it easy to hear the effect that widening (or narrowing) has on a particular band. If you need to mute individual bands so you focus completely on one or two bands while editing them, open up the FX Chain, select the Splitter, and mute the desired output(s) in the edit window's upper-left corner.

Figure 2: Quad Image Enhancer control panel.

How to Use It

When the Width controls are centered, they don't affect the sound. You can crank up the widths for a wider sound, but you can also be a little more strategic. The following audio example plays an excerpt of mixed but unmastered audio, followed by the same excerpt going through the Quad Image Enhancer. For this application, the Lo band is narrowed, Lo Mid unchanged, Hi Mid widened slightly, and Hi widened all the way.

Note that unlike some delay-based widening solutions, this FX Chain doesn't cause any comb filtering-induced phaseyness if collapsed to mono.

PreSonus Quad Image Enhancer Audio Example by Craig Anderton

To widen a sound even further, turn up the Trim control for the Hi Mid or Hi bands by 1-2 dB. Because high frequencies are more directional than low frequencies, emphasizing the high frequencies increases the illusion of width.

Although there are some excellent third-party multiband imaging plug-ins available, you don't need to go outside the Studio One ecosystem-just download the multipreset, and you'll be ready to widen, or narrow, your stereo image.

DOWNLOAD THE QUAD IMAGE ENHANCER PRESET HERE

LINK:	https://blog.presonus.com/index.php/2021/02/26/quad-image-enhancer/...
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