John is quite correct to point out that in an LFR speaker system the DSP performs some essential functions that would otherwise be infeasible to implement. In contrast, these functions are not all needed in non-LFR systems and the only function that is provided by the DSP in such case has only a very subtle effect. Given that the added cost of the DSP is a fairly substantial sum it may be justifiable only to those most comcerned with achieving the absolute best possible sound.