2.5 volts). When using the Line-level signal inputs, the amplifier will also turn on once a +12V signal is detected from the remote turn-on wire. Efficient Cooling Design High performance amplifiers are not only powerful but also compact which depend on overall Efficient Cooling Design. Concert Sound and Elegant Looks JBL Concert amplifiers deliver extraordinary sound experience with elegant industry design. Reliable Performance In order to deliver high quality sound and reliable performance, the high-quality component such as audio capacitors, power MOSFET are selected for Concert amplifiers. Those amplifiers also have to undergo a rigid testing process that would destroy unstable amplifiers. JBL freezes them, bakes them, shakes them, blasts them with ultraviolet light and drives them at full power for days at a time. Technical data 4-Channel Class AB Car Amplifier Rated Power RMS Output: 70W x 4 at 4 ohm; 90W x 4 at 2 ohm; 180W x 2 at 4 ohm bridged, Full\/High-pass\/Low-pass Filter: 40-400Hz,12dB\/octave SN Ratio (1W at 4 ohms): >75dB Frequency Response (-3dB): 10Hz – 45kHz ""/>