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Engineer 418 & 818 User Manual Page 61

Basscreator algorithm

Concept

The Basscreator algorithm creates a virtual bass based on the "lost fundamental" principle: It creates a range

of higher harmonics of a narrow frequency band around a used specified centre frequency. This is a psycho-

acoustical effect that fools your brains to think something is going on in the bass frequency range. There are

numerous advantages to the algorithm, you can:

 Replace some of the original bass in the signal with virtual bass to avoid noise emissions problems.

 Beef up small speakers to give a sense of low end that couldn't be achieved normally on the same

speaker

 Reduce the amount of sub-woofers needed to save space and money

 Use the Basscreator for infill systems to maintain a consistent sound field with the added advantage

of avoiding interference problems with the main systems sub-woofers (the perceived bass is in a

different frequency range)

 Use the Basscreator on small line-array systems to bring the bass in the frequency range where the

line-array is actual capable of behaving as a line-array.

The pictures below give an impression of what happens within the Basscreator algorithm. If we put in a sine

wave with a frequency of 50 Hz and we put the output of the device in an analyzer, we see the sine wave as a

single spike.

Now if we put that same 50 Hz sine wave through the Basscreator algorithm and analyse the output of that we

see the picture below. We see that the original 50 Hz sine wave has been replaced with higher harmonics on

100,150,200 and 250Hz in a certain ratio. To our brains, this harmonic pattern will “sound” as if there was a 50

Hz tone present.

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Martin Audio ENGINEER Betriebsanweisung Seite 61