What are important features in a listening chair

My biggest requirement is the back of the chair should not rise above shoulder level.

Thanks.

I gather so the back of the chair does not effect sound as it moves through the room? 

Do you have any pref. re: materials used and/or adjustability?

My ideal chair is what you would find in a dentist office. Has the headrest that covers the back of your skull and that's about it. A built-in motor to vibrate with bass frequencies (without the sound) for apartment-dwellers would be nice. Cover mine with alligator, please...