Review on DROK 4 Inches 4 Ohm Audio Speakers for Cars - 40W Anti-Magnetic Car Stereo Speakers with 87dB High Sensitivity, Thumping Bass, and Loudspeaker Subwoofer - Ideal for 2.0/2.1 Home Stereo, DIY Boombox, and Satellites by Prem Reyel

I bought a 4" subwoofer for my moped to try and add bass to a system with no bass. It sounded awful, so I returned it and decided to put my own together.I went with this little D-Rok subwoofer which had good reviews and had a big magnet on it.I have a Nippon HC-101 (120Hz) crossover and an Aoshike Added 8-25V Class D amplifier I designed and 3D printed my own box with holes to fit perfectly in the storage compartment under my moped seat It took some adjustments to the punch level in the box to get the perfect sound though after that oh my god I competed in SPL as a kid Designed my own boxes and won the competition I'm a music lover - a stereo in every room r, in any vehicle and portable that you can take with you. For me, it's no longer about volume, it's about real sound quality. This little subwoofer has quality. It won't win any competitions, but it sounds fantastic - better than I ever expected. I can't be happier with this purchase!