For more than 30 years SPL is developing professional audio devices. Recording studios around the world rely on their outstanding sound quality. Mastering studios in particular place the highest demands on audio performance as they put the finishing touches on music productions – with SPL 120V rail technology. In our Professional Fidelity series we call this unsurpassed technology “VOLTAiR” technology. It lets you experience music on the same level as the mastering engineer.