Tang Band 2145 in action

The best wide-bander is still probably the Altec 755 8-inch. 55hz to 8khz. 90+ db sensitivity. You will still need to add a tweeter for the last two octaves using a first-order crossover. The late Art Dudley owned a pair and reviewed them for Stereophile. He mounted each 755 in a large sheet of plywood - open baffle style. Bass as expected rolled-off at 55hz. Art liked the clarity of the midrange and didn't miss having a tweeter! He remarked that the 755 has a cult following that has driven up the prices. I sold my pair in excellent condition for $650 - about what I paid for them! Now I wish I hadn't done that! 

Usual cr*ppy Youtube sound! Why don't you check out the eBay seller who has really nice reproductions of the Altec 755 for ~$300 each. They have impressive-looking motors! I wish I had kept my pair of original 755's. These new versions might be as good or better!

Good news is that there is an eBay seller offering reproductions of the 755. He is coupling the cone/frame to a larger improved motor (magnet/voice coil/spider). They look real nice! About $600 a pair.

Put each 755 in a one-to-two cubic foot sealed cabinet and you'll have something real special! Add a tweeter + cap on top of the cabinet for the last two octaves.

Hey mozartfan - why don’t you check out those new Altec 755 8" drivers that an eBay seller has for around $300 each? Yes they are reproductions but with new higher efficiency magnets! I assume they will be over 90db sensitivity. They look impressive! I would choose them to build an almost-full range speaker. They spec out as going out to 8khz. Yes, you will have to add a tweeter to go higher - but that’s a lot better choice than a driver like a Tang Band with a whizzer cone!