Lots of discussion in a few threads about a nasty and annoying vibration in idle, but only in gear. Not an erratic idle like a dirty throttle body gives you. That goes up and down when the AC compressor kicks on, and can send the idle down to 300-400 RPM and stall the engine out.
If you are unable to detect sounds quieter than 90dB HL, the hearing loss is considered a profound hearing loss for those frequencies. If the average of the frequencies at 500Hz, 1000Hz, and 2000Hz is 90dB or higher, the person is considered deaf. A person who is hard of hearing can have a range of hearing loss from mild to severe. It should be noted that amplification technology is available for people with mild to profound hearing loss.
Studies have found that children who are deaf and hard of hearing are frequently delayed in ToM development (Peterson, Wellman, & Liu, 2005 and Schick, de Villiers, de Villiers, & Hoffmeister, 2007). Having some form of communication (a language) is critical!