digital amplifiers HA 450,HA550,HA650,HA800,HA900,HA1000 1.Slew rate:40v/ ... connector 3.damping factor>600 digital amplifiers HA 450,HA550,HA650,HA800,HA900,HA1000 feature:HA series amplifier in the application requirements ... advanced.3. Your inquiry will be answered within 24 hours.4. Technical advice for speaker box will be offered freely. digital ...