The Quad DAC setup creates a bass texture that is visceral. Sub-bass rumble (listening to Limit to Your Love by James Blake) extends to 20Hz without roll-off. Unlike the "warm" sound of older Sonnix players, the 19 QSP is . Bass is tight, fast, and detailed, but not boosted. Metalheads will love the double-kick separation; EDM fans may want a warmer amp.
If you are considering buying a used 19 QSP Player by Sonnix, be aware of these recurring problems: 19 qsp player by sonnix