Quoted from Munsters:

Unfortunately the pinwoofer kits are poor chinese quality. The buttons feels cheap and not accurate. Further he dont accept his own product to take back. When I started about a review he comes up with a vague proposal to end up still stealing money from me. The pinwoofer set add absolutely nothing to a prem or le. If you have a pro just swap the backbox speakers and cabinet speaker. You can easily do settings in the menu and you don't need such a clumsy poor quality equalizer for that.
See https://flipperfidelity.com/stern-10-3-way-speaker-system-le-spike-2-pro-and-premium/
It’s cheaper and better!