I'm looking into external speakers for my 27" iMac. Although the built-in speakers are powerful enough for daily use, nothing beats the chest thumping power of a good subwoofer. That said, aren't speakers that connect via the headphone jack considered "analog"...which to me, sounds like yesterday's technology? Does anyone know of speakers which connect via the optical port or even USB, making them a true "digital" connection? Am I making too big of a deal about the whole analog vs digital thing? Or, will I get better sound via a digital connection? Curious what people think.