this is one of the best Alpine head unit,its powerful ,it has 23 rms and still very clear sound better than newest model of same brand or other brand around $150 to $250,its not far deference between 9811,9813,9815,9831,9833 and 9835 I love those models because with default setting(no change crossover setting and equalizer setting) I can receive very clear sound,,,but you can't do it with new models and you have to work on it. also you can buy it used model cheeper or the same price of new models
alpine is of good quality that's why I bought it!! Its old version, but Alpine always its been good through out the years!! Overall Alpine is the Shi***!!!!
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