Hello,   I happen to have hyperacusis, specifically on low bass (& only that). I'm hearing low traffic rumbling very loud. Ear plugs are great against higher-pitched noise, but bass, not really. I recently got a pair of ATH ANC9 (for the only reason that they gave specs on how low they would go as for cancelling, while other brands didn't), not really thinking it would work.. but it did!   They really helped, they're cancelling bass very well. But they're not...