You can take control of Impact, Foundation, Detail and Layered Imaging. The result is a more Life-Like illusion. Spectrum Enhancers like the Aphex Aural Exciter can work wonders by adding harmonic richness and air making the top octaves sparkle. The Aphex Big Bottom bass processor adds Impact and Density to bass frequencies without placing increased demands on the amplifier or speakers. A trick done not with mirrors, but using sophisticated triggered LF dynamic range expansion.
Spatial processors add a sense of dimension without adding extra speakers.
Not unnaturally large, but in perspective with the true recording space. The Souvenir ISX by KAB gives you full control over the sense of space and the reinforcment of the center image. The effect is quite startling at first and becomes quite natural after a time. You'll hear, for the first time perhaps, the layered imaging of the original performance. This can happen only when you separate the effects of depth from those of ambience.