"Beat-Sonic" control panel, what is it?

[canuck]

In my post auction photos, there is a "Beat-Sonic" control panel between the front seats. The van is loaded with speakers (more than 12).

 

Anyone know what it is?  Volume controller for rear? 

 

[Aftab]

Hey Canuck, I hope you're well. 

 

A friend of mine had a similar one fitted to his Alphard many years ago. I believe it was to control the audio from the rear.

 

It's an aftermarket system fitted to override the system while it was in satnav mode (for the Japanese Market).

 

 

[canuck]

Solved, the four switches and volume controls are for each of the subwoofers inside the drivers and passengers seat bottom and back.  😝

[Rojie]

6 hours ago, canuck said:

Solved, the four switches and volume controls are for each of the subwoofers inside the drivers and passengers seat bottom and back.  😝

 

Four sub-woofers or bass units ?

That many sub-woofers could make your passengers feel ill with the low frequency vibrations moving their diaphragm.