Autotek ATEQ ATEQ Equalizer ANL Highly Effective Broadhead Stainless steel blades dicing Highly Effective Broadhead It's ideal for use with mobile devices such as iPhone The Autotek ATEQ processor features in dash installation for quick control of master and sub volume 4 band preamp EQ with front rear active crossover featuresLine Driver circuit delivers 9 volts of preamp level signal through the RCAsAudio input selector for switching between head unit and another audio sourceInput level controls for both the car radio and any media device to ensure identical volume levelsMaster volume control of the SPL level for both sound sourcesFront to rear dual amp fader2 audio inputs with level matchingSelectable 12 dB high pass crossover and low pass sub outputSelectable for mono or stereo subwoofer setups45 Hz sub bass control120 Hz mid bass control