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MULTIBAND STEREO IMAGER
Give your track some width with up to four bands.
SPECUS splits your track so you can keep the bass mono and set the rest to taste. The two Stereoize styles do it differently: Style I shapes the added width across frequencies, while Style II puts the new Side 10 or 20 ms behind the centre. You’ve also got three vectorscope modes to see what the stereo image is doing.
01 / CONTROLS
Play with the controls. These interactive models use test signals; they don't process live audio.
Select a band, move a crossover or adjust Width. The space between each pair of lines follows that band's Width.
01 / MULTIBAND
Pull the bass in. Open up the top. Each band gets its own Width setting.
Select a band here and its Width follows you into the Width and Stereoize tabs.
Left and right move as Width changes.
02 / WIDTH
Width pulls the left and right channels together or pushes them apart. The Mid stays put. On a mono source, Width alone has nothing to widen.
At 0%, the original stereo spread is unchanged.
Move the tone frequency to watch the Side change.
03 / STEREOIZE
Choose a style, raise Stereoize and set the selected band's Width above 0%. Style I shapes the Side across frequency. Style II gives it a short delay.
Switch Solo on and only the selected band passes.
04 / SOLO
Turn Solo on to hear one processed band. Turn it off to bring the other active bands back.
This view uses the band count, crossovers and selection set in Multiband.
LIVE follows the signal. PEAK holds its highest recent point.
05 / SPECTRUM
Switch between frames to watch LIVE move and PEAK settle. SPECUS runs the same 8192-point FFT on its output Mid.
Spectrum follows the output Mid. Side energy does not appear in this trace.
Scope display gain: ×2.
06 / STEREO VECTORSCOPE
Choose a test signal. Flip between Polar Trace, Ang. Pwr and XY Plot to see its stereo position, phase and channel balance.
IN PK and OUT PK show sample peaks. If one channel is silent, correlation has no reading.
02 / AUDIO PREVIEW
Switch between BEFORE and AFTER without losing your place.
Loading Preview 01 BEFORE.
03 / DOWNLOAD
Choose your platform
04 / TECHNICAL NOTES
01
SPECUS separates the input into Mid and Side, then routes both through the active FIR bands. Width controls the Side already present. Stereoize adds Side from Mid in bands whose Width is above 0%.
The bands meet again before Output gain. Every band follows the same timing reference.
02
Up to three adjustable crossovers divide the signal into four bands. Complementary FIR filters form the bands from differences between lowpass responses, with the same delay on each path.
If no further processing is applied, summing the bands reconstructs the signal with that shared delay.
03
Mid is the average of the left and right channels. Side is half of their left-minus-right difference. When SPECUS rebuilds the output, it adds Side to the centre for the left channel and subtracts Side for the right.
At −100%, the Side closes down to mono. At 0%, you hear the original width. At +100%, the existing Side doubles. On a mono source, there is no Side for Width to amplify.
04
Style I generates Side with a frequency-shaped phase relationship. Its low end stays restrained around 400 Hz, and the effect eases off near 18 kHz.
Set an active band's Width above 0% to let it through. Stereoize amount sets how much generated Side joins the signal; the Mid stays at its processing level.
05
Style II delays the generated Side behind the Mid. Choose 20 ms for a longer separation or 10 ms for a tighter one. Band Width must be above 0% for the effect to come through.
That timing applies to the Side path. The plugin's reported latency stays the same.
06
Fold left and right to mono and the added Side cancels, leaving the processed Mid. Check the result in your mix: width and peaks still depend on the source.
07
Spectrum reads the output Mid through an 8192-point FFT with a Blackman–Harris window. Stereo Vectorscope reads output left and right in Polar Trace, Ang. Pwr or XY Plot mode.
Correlation tracks the relationship between the channels. IN PK and OUT PK show sample peaks.
08
The FIR path adds around 10.67 ms of shared delay at supported sample rates. SPECUS reports that delay to the host for compensation.