Boston Acoustics A26gb Black Bookshelf Speaker 61/2 Inch 2way What's Included One A 26 two-way 6-1/2-inch bookshelf speaker and instructions. Bookshelf Speaker Delivers Powerful Sound. Soft Dome Tweeter Offers Crisp High-Frequency Detail. Innovative Cabinet Shape Improves Stereo Imaging.. Easy Hook-Up 5-way gold-plated binding posts provide total hook-up flexibility and the purest signal transfer.