Cheap And Discounts ZK-2001 TPA3221 100WX2 Dual Channel Pure Rear Stage Digital Amplifier Board 200W AMP Bridged Mono Subwoofer Speaker Wholesale. Buy Directly From Merchant Shop1103747211 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.