Hi qi,
Ord for me:
1. https://www.amazon.com/Yung-SD300-Subwoofer-Amplifier-Module/dp/B009ITB7MY?ref_=Oct_RAsinC_Ajax_11042191_5&pf_rd_r=W16GYREYRT5RSFWP3HDP&pf_rd_p=72ab0a5b-7a6e-5a00-8625-398858371165&pf_rd_s=merchandised-search-6&pf_rd_t=101&pf_rd_i=11042191&pf_rd_m=ATVPDKIKX0DER
120 x 1.42...