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? 

 

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).

 

 

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

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.

On 2/23/2025 at 12:36 PM, Rojie said:

 

Four sub-woofers or bass units ?

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

 

I dunno ... that sounds awesome