Logitech Z623, THX certified 2.1 with 400 watts peak: the powered subwoofer and both satellite speakers, the set people still hunt for years after Logitech stopped making it.The Z623 is the one that earned the reputation. The sub is a real ported cabinet with a downward firing driver, not a plastic box with a hum, and THX certification meant Logitech had to hit a defined output and distortion target instead of a marketing number. That is why used pairs still move while newer plastic 2.1 sets sit.WHY IT STILL SELLSIt plugs into anything. A 3.5mm jack, a second 3.5mm input and RCA on the back, so it drives a PC, a TV, a turntable with a preamp, a console or a phone with no adapter hunting. Power and volume live on the right satellite where your hand already is, with a headphone jack and an aux jack on the same face.WHAT YOU GETLogitech Z623 powered subwooferBoth satellite speakers with their attached cablesRight satellite with the volume, bass and power controls, headphone and aux jacksWHAT I DID NOT DOSold UNTESTED and as-is. I have not powered it up, so I make no claim about the sound, the amplifier or the controls, and it is priced under the tested comps because of that.CONDITIONCosmetically clean. The grilles, the cones and the control knobs are photographed close up so you can judge it yourself. Nothing has been opened or repaired.Ships double boxed, the subwoofer packed as the heavy part, out within one business day of cleared payment. Local pickup in Kennett Square PA is welcome.Logitech Z623, Z-623, THX 2.1 speakers, computer speakers with subwoofer, gaming speakers, PC sound system, powered subwoofer, desktop audio, TV speakers