In September, Amazon introduced an ad-free tier to its Prime Video streaming service. This new tier comes with an additional cost of 3.99 per month on top of the standard 8.99 monthly subscription fee for Prime. However, it was recently brought to light that Amazon has silently removed support for Dolby Vision and Dolby Atmos audiovisual enhancements from the regular Prime membership without making any public announcements.　　German website 4kfilme.de first reported this change, which was later ed by an Amazon spokesperson, Katie Barker. She stated that access to Dolby Vision and Dolby Atmos is now exclusive to the ad-free option for subscribers, applicable to relevant titles only.　　Dolby Vision offers advanced high dynamic range HDR video technology, while Dolby Atmos provides a premium surround-sound experience. Consequently, subscribers who dont upgrade to the ad-free tier will no longer enjoy these higher-quality audio and video formats that were previously accessible to all Prime members.　　In other news, a class action lawsuit was filed against Amazon in a federal court in California on Friday. The suit claims that Amazon breached its contract with over 100 million subscribers and violated state consumer protection laws when it implemented tiered services. Plaintiffs argue that those who purchased annual subscriptions before the pricing structure change were misled, as they reasonably expected the same level of service – including ad-free streaming – throughout their subscription period, as stipulated in the lawsuits text.