We've harnessed the incredible data processing power of the latest chip technology to bring you superior sound. Built into every I-Sonic ES and I-Sonic ES2 is a Digital Signal Processor (DSP) with the processing power of a small computer. Polk engineers have programmed the DSP to ensure that you hear incredible sound at every volume level in every spot in the room. First a Dynamic Loudness Contour automatically adjusts bass and treble response to account for your ears' frequency sensitivity at low volume. You'll hear rich well balanced sound even at late night listening levels. The DSP also prevents distortion at high volume with its Dynamic Compression. Go ahead, crank up the volume and play air guitar to your heart's content. With I-Sonic the sound will always be crisp, clear and clean. Finally, the powerful DSP controls the time delay and frequency shaping that is behind Polk's exclusive and patented I-Sonic four-speaker technology. You'll hear full bodied, huge stereo sound in every spot in your room.

No matter how hard we've worked to perfect I-Sonic's sound, there may be times when you'll want to adjust the sound to suit your personal taste or to compensate for sonic flaws in program material. I-Sonic has user adjustable Bass and Treble controls. That may seem like a simple feature but you'd be amazed how few premium compact audio systems offer this useful and basic feature. Check out our comparison chart to see how I-Sonic stacks up to the competition on this and other vital features.