I want to buy a head unit that definitely doesn’t have a high and low pass filter. My previous radios always had this, so I connected the front speakers directly to the radio and set up high pass filters to 100hz. Subwoofer was operated by Chinch at a power amplifier. So I could listen to music completely ok for me without much effort. Now I want to get a double Din Radio from Pumpkin what Android has as operating system. But I just want to try this now. However, this radio does not offer HPF or LPS. Is there a switch or filter that does the job that my old radio solved internally. So I still want to connect the serial speakers directly to the radio.