Alpine Electronics of America has been producing mobile electronics since 1978. Alpine’s Type-R series of speakers are preferred by many car audio enthusiasts for sound quality and durability. There are four sizes of the Type-R subwoofer model, ranging from 8 inches to 15 inches, and each speaker can be bought with either a 2-ohm dual-voice coil or a 4-ohm dual-voice coil. No matter which voice coil configuration you use, the box size will be the same. Writer Bio
