Need advise regarding small bookshelf monitor

NHT Classic threes

How much do you want to spend?
Tobias speaks the truth, North Acoustics speakers are made for this type of application.

Pricing -- in the $3-500 range. Keep the recommendations coming as I'm not familiar with bookshelf speakers as have never peaked my interest -- these would be for my sisters' system & I don't have a clue as to what amp they are using -- probably along the big box store line; i.e., Yamaha, Pioneer, Sansui, etc.

$300 will get you a new pair of Epos ELS 3s. I actually have a pair at my office in a bookcase, they work quite well there. NAD receiver is the power.

Energy Loudspeakers manufactures some good bookshelf monitors at reasonable prices. I had a pair of the Take 5's for a while. No bass but good for a 2nd pair in a small office or for surrounds. They have a C-100, C-50, and RC-Mini that will fit your space requirements. I was going to suggest the Proac Tablette 8 Ref speakers which will fit in your space but they are a very high priced speaker line out of the UK. Even their small units are way up there. B&W produces some mini-monitors such as the LM-1 and M-1. I have 3 of the M-1's as my surrounds and center channel. Super sound but again, no bass. The M-1's I believe sell for $200.00/each.