... .standard 3-pole connector 3.damping factor>600 digital amplifiers HA 450,HA550,HA650,HA800,HA900,HA1000 feature:HA ... reduction in weight and smaller size, but also has high power output performance, unlimited application in a variety of fields, ... be answered within 24 hours.4. Technical advice for speaker box will be offered freely. high power digital amplifiers HA1000 of multiple appliation