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Quick Links
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 SEQ1
7–band equalizer, offering fully
parametric bell-curves, HPF, LPF, high & low shelving EQ and
optional graphical feedback.
SEQ2
Multi-band spline equalizer, offering a
full range 10Hz to 30KHz spline envelope, HPF, LPF, high & low
shelving EQ, and optional spectral analysis feedback.
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SEQ Series EQ
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Clean
| Transparent | Detailed |
 SEQ1
SEQ2 |
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The Linear
phase advantage
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The
NuGen Audio SEQ series, unlike many digital EQ’s, is linear phase. This
means that the phase shift is linear across the frequency spectrum,
resulting in a natural sounding EQ change, and producing minimal phase
artifacts. more...
 Transparent performance
Sharper Transients
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 No phase warping
No
phase smearing
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"SEQ
1 and 2 provide more clarity than conventional EQs... and are about the
most versatile pair of EQ plug-ins I’ve ever used....
the SEQ series can turn its hand to jobs that many other EQ's couldn’t
attempt!" |
| Martin
Walker, Sound on Sound magazine |
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Key Benefits
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Why Linear Phase?
The
NuGen Audio SEQ series, unlike many digital EQ’s, is linear phase. This
means that the phase shift is linear across the frequency spectrum,
resulting in a natural sounding EQ change, and producing minimal phase
artifacts.
Traditional EQ algorithms employ a mathematical technique known as IIR
(Infinite Impulse Response). Whilst this provides low CPU usage and is
relatively simple from a mathematical point of view, there is an
important side effect known as Phase Warping. Digital EQ utilising the
classic the IIR approach distorts the relationship between frequency
and phase.
The computational algorithm employed in SEQ1 is based up on FFT (Fast
Fourier Transform Analysis). This is a much more involved process,
involving transformation of the audio data into the frequency domain,
before applying frequency related computations and then transforming
back into the temporal domain. The advantage of this process is that
the frequency and temporal relationship remains intact – linear phase
transformation. The benefit of this method is that linear phase
adjustments sound clearer, it is possible to create a much more
transparent EQ using this technology. Phase Warping also affects the
clarity of transients, as it causes Phase Smearing. Linear Phase
calculations avoid this limitation, producing a sharper audio image.
Analogue
curves
The SEQ series also features
analogue shaped EQ curves for greater clarity and accuracy in the high
frequencies.
The traditional approach to
digital EQ has suffered from an inability to properly represent audio
as the frequency approaches the top end of the usable spectrum (known
as the Nyquist frequency). This leads to a warping of the expected
natural EQ curve.
No-one told analogue EQ about the Nyquist frequency, so it doesn't take
any notice of this limitation and produces symmetrical curves at any
frequency. The SEQ series utilises algorithms that overcome this
problem, producing analogue shaped symmetrical curves, even to the top
of the frequency range.
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Classic
Digital EQ
The
Bell curve distorts badly out of shape as the
filter approaches the
Nyquist frequency
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SEQ
Series EQ
Analogue shaped symmetry is maintained |
High Resolution
Another common problem - this time associated with linear phase FFT EQ
- is a lack of resolution in the low frequencies. The SEQ series EQ's
have the resolution you need at a scalable factor suited to the task
at hand - the only question is 'how much do you need?'. If you need it,
crank the Quality setting all the way up - eg. during mastering - but
if you don't, you can also choose to go easy on the CPU.
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| Narrow Q band EQ
boost, frequency varies [white noise test]* |
| This real-world (no names)
example shows how the SEQ filter maintains definition all the way down
to 40Hz and below (blue trace) - well into the range where frequency
roll off is common practice. The standard LP filter (red trace) looses
shape and focus rapidly below 100 Hz, making precise adjustment very
difficult. |
High Sample Rates
Digital EQ can also suffer when it comes to higher sample rates. In the
case of Classic Digital EQ, they are often not supported at all. Where
they are, in a typical linear phase EQ, it can again be at the cost of
resolution, particularly in the low frequencies.
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| Narrow Q band, EQ
boost, sample rate varies [white noise
test]* |
| Where as the SEQ filters (blue
trace) perform well, it can clearly be seen that the typical LP filter
(red trace) does not provide definition at higher sample rates, making
it difficult to make precise adjustments, even at relatively modest
frequencies. |
Connective Technology
The
SEQ series also boasts connective technology. This means that it is
possible to link the quality settings of multiple instances together.
This can be especially useful if you wish to use the same set-up
for mixing and mixdown maximising CPU allocation for each
phase of production, without having to change every plug-in on every
track. The quality setting for linked instances can be changed
globally, simply by changing the setting on one instance. This means
that you can easily save CPU when working with 'live' CPU intensive
plugins, and then step it up to the max at mixdown - scalable,
connective technology. Of course, it is also possible to use individual
instances at different settings, simply by deselecting the link option.
*These traces are
real world white noise examples, measured using NuGen Audio Visualizer.
It is important to note that many spectrum analysis programs do not
allow fft window (block) sizes large enough to properly investigate low
frequency
behaviour, and will themselves give a
distorted picture.
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| SEQ Series EQ
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Clean
| Transparent | Detailed |
SEQ1
SEQ2 |
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| Save on SEQ1 and SEQ2 |
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Huge savings of up to 30% with our attractive product bundles. more...
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| System Requirements |
SEQ series EQ's are available in VST and AU formats for PC and Mac
(universal
binary)
Mac OSX 10.4.x, G4 1.4 GHz or Intel® Core™ Duo 1.66 GHz, 512 MB RAM
Windows XP or Windows Vista, Pentium 1.4 GHz, 512 MB RAM
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| NuGen Studio |
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A complete solution for the
control and enhancement of your spatial image and our comprehensive
audio analysis software. more...
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