Eton has the boxing system reviewed here on a reasonable solution to improve the sound quality in the BMW 1 Series (E87). The components leave a high quality impression and the installation documentation is managed. With a little skill you can install the system in less than an hour. Since the speakers are built deeper than the simple of BMW and you have to stow the additional crossover between midrange and tweeter, however, you should pay attention to a clean cable routing. The included cables are long enough so that a trouble-free installation is possible. Operated without amplifier, with the regular under-seat basses of BMW and the CD radio Professional (in my case from Alpine) ensures the Eton system for a significant improvement. Heights are differentiated perceive the bass is rich and the speakers are designed for higher volume than the default installed. Probably a reasonable final stage will be able to get out of the speakers even more, but without final stage in the aforementioned constellation already not listening to improve the tonal qualities.
