EUPHORIA (EDSP4-31BT) 31 BAND DIGITAL SOUND PROCESSOR WITH BUILT-IN AMPLIFIER FEATURES: OEM system integration sound processor perfect for OEM factory speaker tuning Built-in 4.2 lossless Bluetooth & SQ player Built-in USB port to support MP3 lossless audio file 64-bit DSP with floating point processing technology 2CH low and/or 4Ch high-level inputs, 8ch low outputs 8 channel infinitely adjustable digitally processed channels High Resolution Music signal from USB source Sources: Bluetooth audio, high-level input (head unit signal), Stereo RCA analog inputs (aftermarket head unit signal) Built-in 4x75w amplifier with infinitely adjustable digitally processed channels 31 bands of independent equalization per channel Real time parametric and graphic equalizer Frequency range 20Hz – 20KHz, 1Hz steps Adjustable Gain: -12.0dB – + 12.0Db for all 31 bands High pass, low pass and bandpass, independent filters per channel Infinite filter crossover points between 20Hz – 20KHz Crossover filter slopes selectable at: 6dB, 12dB, 18dB, 24dB, 30dB, 36dB, 42dB, 48dB Up to 20ms/692ms of variable time delay per channel 0 deg. Or 180 deg. Direct phase adjustment per channel Complete system control through smartphone app connection or Advanced tuning capability when connected to your PC IOS and android compatible app 6 tuning preset memory Compatible size design for easy installation