QX4 unit is a power purifier that is affective without compromising the peak current capabilities of your power supply or the integrity of your grounding. Each QX unit contains QRT field generators (two in the QX2, four in the twice as powerful QX4) that alleviate the impact of poor quality AC power on your sensitive electronics, limiting RFI and timing errors. Place your QX unit(s) at the heart of your system and you’ll hear a lower noise floor, greater dynamic range, more fluid musical expression and greater space and ambience. QX units allow you to hear more of your music (and less of your system). Used in conjunction with each other as well as the QBASE-Mark IIs, Qv2s and Qk1s, both the QX2 and Qx4 provide a highly effective answer to the insidious influence of poor AC supplies on musical reproduction. And because of QRT’s modular approach to AC treatment, you can add additional units as you go along – they never become redundant. Once you’ve heard the sense of life and effortless musical flow that comes from having QRT technology in your system, you will want more – which is what makes the modular nature of the QRT products so appealing.