Ok guys here we go again! j&m is shit! DD is shit! Quality speaker need quality magnets!if you think of magnets as a motor it makes sense. how can rms be 50 watts and max be 150 watts? if you put 150 watts to either of those units they will melt. Do your home work first then look at price.this can be a one time plug and play up grade! And I would start with biktronics. There amp. Is not inexpensive but it is pretty close to being the best motorcycle amp. On the market! And there 6.5 coaxle speakers are pretty Amazing.