Http://joentell.com/booking
Here, I'm using MSO (Multi-Sub Optimizer) for a client with 4 subwoofers, to get the best seat-to-seat consistency. I've taken into account the frequency response and phase of the other main speakers to achieve the best possible blend with the subwoofers. AFFILIATE LINKS:
Crutchfield: https://howl.me/ckjnBvmnd5M
Best Buy: https://howl.me/ckjoam20vaE
Target: https://howl.me/ckjoaHc0z1l
Disclosure: The Affiliate links above earn me a commission if you purchase using those links. This is at no additional cost to you. This product was sent free for the purpose of this review.