Hi Chris, In the blog on how to use a cross over, use-2-way-passive-crossover it states that it should be used with our high powered amp kit or an equivalent amp kit. The Bluetooth kit outputs 3W per channel and as such is less than the high powered amp kit so it is unlikely that you would get the most from this crossover. The one listed in the PDF is a lower power crossover which we now don’t stock. I have advised our web team that this needs to be updated. However the connections should be as follows, + speaker output from the amp kit to the + input on the crossover, - from the amp kit to one of the common terminals on the crossover. Then the + from the woofer and tweeter go to the individual terminals on the crossover and the negative from both would go the either one of the common terminals.