Some OEM sources/head-units have a test circuit that monitors the presence of a low-impedance load to enable audio outputs. When you connect this type of head-unit to the high-level inputs of an Audison bit processor, which has a high impedance load, audio outputs are silenced. By inserting the USS 4 between the source and the processor / amplifier, these problems are definitively solved. If there is a need to generate a remote signal to control the amplifier turn on/off, it is necessary to power* the USS4, providing the additional feature of the possibility to delay the signal from 1 to 8 seconds, so as to avoid annoying “bumps” upon ignition. ProductSiteLaunchDate : 2021-09-28T15:14:43.276Z SeriesNumber : 4 Size : 4 Channel SpeakerSize : 4 inches SpeakersMaximumOutputPower : 50 watts SpeakerType : Component SpecificationMet : Ip67 StreetDate : 2021-07-23T00:00:01Z Style : 4-Channel SupplierDeclaredDgHzRegulation : not_applicable SurroundSoundChannelConfiguration : 4.0 TargetGender : unisex TunerTechnology : DAB UnitCount : 1 UnspscCode : 52161500 Voltage : 6 volts WarrantyType : Limited WaterResistanceLevel : not_water_resistant Wattage : 50 watts