Not a ridiculous idea at all, just keep in mind that some speakers are better at it than others. You will also lose some audiophile niceties like sense of separation and disappearing in a room.
The conventional wisdom is to go with sealed or front ported speakers, though there are some rear ported speakers that were actually designed to go against a wall. In essence, by being placed on a shelf in a bookcase, your speaker is becoming a box inside a box.
I have been living with my speakers placed in this way for most of my life. Indoor cats and less than understanding wives made stand mounts a non-starter. Lately I have been less caring about opinions and peace, and have gone with Zu Audio floor standers.
If possible and depending on the height of the bookcase, having the speakers on top of the bookcase will be preferable to having them inside the bookcase.
Speakers that have served me the best inside the bookcase and on top of the bookcase:
Omega Super 7 MK2
Omega Super 3i
Rega R1
NHT Classic 2
The Zu Audio Cubes or Omen bookshelf speakers look promising.
Rich
The conventional wisdom is to go with sealed or front ported speakers, though there are some rear ported speakers that were actually designed to go against a wall. In essence, by being placed on a shelf in a bookcase, your speaker is becoming a box inside a box.
I have been living with my speakers placed in this way for most of my life. Indoor cats and less than understanding wives made stand mounts a non-starter. Lately I have been less caring about opinions and peace, and have gone with Zu Audio floor standers.
If possible and depending on the height of the bookcase, having the speakers on top of the bookcase will be preferable to having them inside the bookcase.
Speakers that have served me the best inside the bookcase and on top of the bookcase:
Omega Super 7 MK2
Omega Super 3i
Rega R1
NHT Classic 2
The Zu Audio Cubes or Omen bookshelf speakers look promising.
Rich