yeah, Loudness can make the better sound performance on the treble & bass. We know every player system has treble & bass mode, but this is not enough to increase the better performance without the Loudness. For eg. treble & bass can up to the maximum by 100% but if we can use the Loudness, it may can increase extra 30% those total maximum at 130% for treble & bass. This system we no need to install equalizer or amplifier if we want to play for internal sound.

My previous car has include the original player from Clarion brand those have better sound system than Volvo SC-802. It is without to use equalizer or amplifier. Once I activated the Loudness, all the bass & treble will automatic to increase the better sound system inside the car just like we using the amplifier....