In their shiny and matt-black casing, this pair of JBL Studio Monitor Lsr305 studio speakers looks as good as it sounds. The speakers are active, which means they have built-in amplifiers. In addition to their compact size, with an external depth of 251mm, the speakers offer quality sound. Suitable for individual enjoyment and for revving up parties, the speakers weigh 4.6kg and require a UK supply voltage of 240V.