Jays from Sweden joined the earphone market in 2006 with the balanced armature earphone, d-Jays. Since then, their engineers have been busy creating new technology and designs for their products. Later, they introduced the dynamic driver, j-Jays and the dual balanced armature, q-Jays that we tested in May 2009. Today, we have the s-Jays, an earphone that uses a new technology dubbed, ‘siren’, which refers to armature drivers which work similarly to moving coil drivers (dynamic). The drivers are designed to maximize low frequency performance and allow for high volume output without distortion. Jays has taken this technology and put it in their s-Jay, for the reasonable sum of $89.99.