Hi. Would like to improve the sound in my car Astra J 5 door. Have the CD400 and the original boxes. (I find a good sound) I would still like to front with Alubutyl dams. Should have a nice sound and not all too big, so support the front boxes with bass. Have also thought about Active Sub and posted a few below. Listen to a lot of Hip Hop and House. -)Which subwoofer and power amplifier can you recommend to me? An active under seat or yet amplifier and Kis Would the sound be fed with high and low adapters. -) Do you also need a power amp for the front series boxes? Do they come with, with a large woofer? -) Could also buy something needed. Check out most of the time. http://www.willhaben.at What do you say to these used subs? There is so much choice and I have no idea which companies are good and so on :blink: :blink: :blink: Hertz Energy EBX 300: https://www.willhaben.at/…/ KICKER SUBWOOFER + FUSION VERSträrker: https://www. willhaben.at/…/ KICKER Subwoofer box: https://www.willhaben.at/…/ Rockford Fosgate Punch P1 Subwoofer + Housing + Ground Zero GZTA 2250 Amplifier: https://www.willhaben.at/…/ ESX SXB12 Subwoofer; Woofer 300 Watt and Axton C408 Amplifier: https://www.willhaben.at/…/ JL Audio 15 W4-D2: https://www.willhaben.at/…/ Subwoofer set – Kicker KPX 550.1 + Amplifier: https://www.willhaben.at/…/ Focal Subwoofer, Local Amplifier<: https://www.willhaben.at/.../ Axton AB20 Subwoofer + Konic VSR 1005 : https://www.willhaben.at/.../ Or an active person? JBL BassPro II: https://www.willhaben.at/.../ Pioneer-TS-WX120A active person: http://www.amazon.de/.../ref=sr_1_3?... Axton-AXB20STP: http://www.amazon.de/.../ref=sr_1_5?... Axton-AXB25P-AXB-25-P: http://www.amazon.de/.../ref=sr_1_32?... Eton-Move-M12-400A: http://www.amazon.de/.../ref=sr_1_23?...