DSP520 In-Wall Digital Active Loudspeaker Music and Movies The DSP520 in-wall loudspeaker is perfect for delivering high quality music discretely in any living or cinema room. Incorporating the latest audio enhancing technologies from Meridian’s floorstanding loudspeakers including Enhanced Bass Alignment (EBA) and Centre Elevation, the DSP520 provides incredibly lifelike and spacious sound. This makes the DSP520 a perfect choice for stereo or full surround and with an ultra-narrow box design, ensures that there is virtually no visual impact to the decor.