![Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2019/24/700/g700ISW4SA-F.jpg)
Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield
![Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2019/24/700/g700ISW4SA-M.jpg)
Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield
![Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield Bowers & Wilkins ISW4 and SA250 Mk2 Bass Package Passive in-wall subwoofer with matching external amplifier and back-box at Crutchfield](https://images.crutchfieldonline.com/ImageHandler/trim/750/457/products/2019/23/749/g749ISW4-o_other1.jpg)