The SL2.15i (8 ohm) is double 15” subwoofer. Acoustical design is based on direct radiation system with bass reflex. The speakers cabinets can be easily stacked close to the wall and combined arbitrarily with SL412i Mid-Hi enclosure. It also functions as a very effective upper bass cabinet when used alongside the Ultra Low Frequency VHD1.21 subwoofers as part of a five way active system. The requirement for truly ‘environment integrated’ enclosures is always a difficult prospect, with large, or often deep enclosures protruding into and breaking up sight lines. Requests are often received from both architects and interior designers for less obtrusive units, whilst providing the highest integrity in sound quality, output and coverage. SL2.15i is exact identical performance and finish units of the existing & SL2.15, except they do not incorporate the fixed handles for touring and presentation use. The ‘I’ version is designated for fixed installation use with the same existing mounting and flyware fixings.