Low and Low-toned

Low adjective - Very low in volume.

Low-toned is a synonym for low in bass topic. In some cases you can use "Low-toned" instead an adjective "Low".

Low-toned adjective - Very low in volume.

Low is a synonym for low-toned in mild topic. You can use "Low" instead an adjective phrase "Low-toned", if it concerns topics such as intense in effect on senses.