Anyone upgrade the factory speakers on a DB11 using the factory amplifier? Searched and searched but couldn't find anyone that has. My daily is an X7 with bowers and wilkins stereo and I'm spoiled from that haha, the Aston's stereo (upgraded audio, but not B&O) sounds too flat, bass is just meh and washes into the highs too much. I'm thinking maybe upgrade the sub and tweeters but unsure of the impedance of the factory setup.