30 COMSOL NEWS A fundamental constraint of conventional acoustic treatments is that their dimensions limit their use frequency-wise (the thinner, the lesser the performance toward low frequencies), or that they rely on resonances to enhance their acoustic effect and are therefore restricted to a very narrow frequency band. For example, a membrane absorber (bass trap) placed in the corner of a recording studio to absorb low-frequency sounds that build up and interfere with the quality of the audio being produced only affects a limited frequency range around its resonance. However, these nuisance low frequencies usually span the 20 to 200 Hz range and a single acoustic treatment cannot absorb over this range of frequencies. ð DIRECTING WAVEFRONT TRAFFIC It is

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