I use these speakers for 18 months, and I'm not quite happy because in fact the sound is very clear but sorely lacking in bass, I really feel that 15 inches is pointless to Elsewhere looking more closely at the 15 "has moved slightly same high volume it does not feel the strike of 15 inches. These speakers send out their 50 watt treble but surely not 350 watt bass. So over 900 € the enclosure is a shame to still invest in an equalizer for the bass can be with these speakers There is a small built-in equalizer in red position reinforces the bass and still nothing big disappointment bass. I even asked if my speakers were defective, and having met another DJ with the same speakers and same problem .... no bass.