Instead of using the rear speakers, it is also possible to use normal wiring to make the rear speakers sound from a bi-amp with double the power of the front speakers.

If you don't need to attach rear speakers, or if you have extra rear channels and don't plan to use them, you can use the power that drives the rear speakers to the tweeter channel of the front speakers, and use the genuine fader function. By freely changing the ratio between the tweeter and the door speaker, you can adjust the tweeter volume on the deck screen. This is really convenient, and is recommended for people who want to take advantage of the deck's functions and don't have plans to attach a separate amplifier, or who want to easily build a system.