(*Note: I have normal hearing and mainly got the unit so that I could listen to TV via headphones while others slept, although we also have visitors that I know will appreciate the volume boosting characteristics of the unit. The way around the loud, lowest setting in my setup was to run it through a portable headphone amp with a mini cable and using the amp for volume control. I tested it with a PA2V2 (although I would guess that any amp would do) and was able to get the audio volume to the perfect level. The other possible option is to team it with power hungry headphones that need to be driven by an amp.) Below is a pic of the PA2V2 amp:
As an example, I am a big fan of the Tivoli Pal Radios. They have an aux input that you could plug the handset into and be able to listen to the source over the speaker. However, the Tivoli can also work as an amp since you can plug the headset into the aux input and use the Tivoli headphone output to adjust volume. Below are a couple of pictures of the Pal. Notice that it also has a (great) tuner so you can also just use it for radio.
To be more detailed, my setup has a Denon receiver that feeds the TV video and my 5.1 speakers an audio signal. However, the receiver provides an option to send audio to the TV instead, so I picked that option, and it gives me access to audio from the RCA outputs of my TV. It works with all sources and even when I change the TVs input source from HDMI 1 to HDMI 2, for example, the audio travels with it.
Wireless audio of all sources
Standard headphone port
No mute button
Handset needs to be recharged on the mount connected to the TV