Try to get some noise level readings in dbA. The NIOSH app is good on iPhones.I have something similar when driving our Skoda Octavia. Anything over about 30 minutes and my ears are ringing when I get out and I feel like my head’s been in a washing machine.
I’ve put it down to some sort of ambient vibration or background noise frequency that I can’t actually hear. It doesn’t affect the wife at all.
When I used to borrow the Octavia to go to work I would sometimes put those little foam earplugs into my ears for the journey and that prevented the problem. Maybe confirming my noise frequency theory.
So……maybe worth popping some of those in nice and tight for your next journey. Only cost a few cents.
These things…
40 x Howard Leight Laser Lite Ear Plugs (FREE UK P&P) 5060292680620 | eBay
40 Howard Leight Laser Lite 'T' Shaped Ear Plugs SNR35 (20 Pairs). The non-irritating non-allergenic self-adjusting foam recovers to fit virtually any ear canal. 40 earplugs supplied in a grip seal bag.www.ebay.co.uk
Sometimes older tires will be really bad/ hard.
New silent tires + door insulation is game changer in many cases.