Using equalizer / DSPs to defeat room modes

As a solution against room modes many manufacturers offer DSP-based equalizer for room correction purposes. These fight room modes by reducing the level of volume at the respective frequency. This leads to a reduction of "boomyness". But: The bass still decays slowly, there is no improvement in that area. Furthermore with an eq you also reduce the first wave front, that is the sound before it gets reflected by walls. As aresult the bass sounds powerless.


A backfill of cancellations by increasing the volume at the problematic frequency is mostly not recommendable as this stresses the power amplifier and in many cases it has no effect. That is because the frequencies cancel each other, no matter how much energy is pumped in.


But an equalizer still often is a reasonable tool. With it you can fine tune the bass to your personal taste. Ideally you should use an eq that can be adjusted precisely, that means you can choose the frequency in 1 hz increments and also the bandwidth of the effect (q-factor). Many devices only offer a graphic eq with fixed bands.


Automatic room correction systems:

Generally an automatic room correction system is nothing more than a software, that automatically creates eq filters based on measurements that have been made. If these filters are precise is often not clear. The algorithms of those systems are often not transparent and often not manually adjustable. So it can be the software is setting the right filters or not. Good room correction systems offer the user to make adjustments. Such systems can (but do not have to) be valuable.

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