I didn’t use any meters, so all thoughts are subjective. I did use some Silent Coat 2mm on the door skin and the inner skin, not much, around a sheet and half each side.
I also connected my phone to the media port on the back of the head unit with a £5 cable off amazon. This works but does not go as load as the radio, so not much use top down at 80mph. Sound quality is on a par with the radio, but no better. My CD player doesn’t work, so most testing/listening was down with the FM radio.
I now have the Focal kit (ISU 200 which is a 20cm/8 inch woofer and a one inch tweeter component kit).
Initial thoughts were that it was a big improvement, but after a day in the car today, I am not so sure.
I also tried unplugging the dash speaker to see if that helped.
My thoughts are that the Focal kit misses a mid range speaker, and unplugging the central dash Bose speaker highlights that. Another thought is that the Bose speakers may just be ‘brighter’ and that compensates for inadequacies with the head unit or amplifier that the Bose speakers cover over, but the Focals expose.
So, were they worth £140 to replace the Bose door speakers? I go back to my initial thoughts that they are a big improvement, and maybe my expectations were too high ànd that is why after spending time in the car today I am a bit disappointed. On balance, yes, worth the money. But at a cost of $380 in the US, I would not be happy.
Next steps are either a new head unit (but still using the Bose Amp) and see what that results with. Or replacing the tweeters with a three inch coaxial mid range and tweeter speaker.
As my head unit has a broken CD, it seems sensible to swap that out. And in hindsight, maybe I should have done this first. The reason I didn’t was I was waiting for the media port connection to my phone, which could have given me everything I needed had it provided the quality I hoped for. It didn’t.