So, don’t have this problem myself, but with a familiar in his Renault Kangoo crash his 10s speakers madly as soon as he turns the radio up to over 20. (is n cheap JVC something – 312) you can really beat the bass on the radio, but that doesn’t sound good. can you just let the speakers play up to about 300hz and deeper not? the radio has so much I have seen no Hp/Lp function and an extra end level for the speakers will also not is a pity because the originals sound really nice in the middle tone and high tone. the other argument which speaks for speaker exchange, which are front in the armature board and which I do not attack, because I have no idea of car and elekronik and in the immediate vicinity of the airbag, which I do not want to damage by any puff. mfg mazda