Vauxhall gave me a date to check with the garage in 5 months... with the likelihood that speakers wouldn't be covered under warranty due to wear and tear, unless it's deemed as a clear and obvious issue.
I have since took the car to a local person who specializes in audio systems. He ran a few tests and determined the speakers are fine, and wants to take a closer look at the wiring and amplification at a later date.
I hope this isn't correct as it will be a pain to sort, but he suspects that because it's a GS line with 8 speakers, not the 6, they haven't factored in the correct amplification, so at higher music levels, Distortion and volume reduction will occur.
I also spoke to someone else on another forum who has the exact same issue, he too has a GS line with 8 speakers, not the 6. So if you do have the same set up, check it out the next time you are driving. Note: When you first enter the car, music at loud volume will work okay temporarily until you drive off. It then reduces significantly and distorts.
Will keep this thread posted as i attempt to resolve this little frustrating issue
Want to say though, other than this issue, this is one of the best cars i have owned.
2022 Vauxhall Astra L - GS Line - 1.6 PHEV w/hud, 8 speakers & 18" alloys
