Welcome to AC

Do a favor to your wallet and your time, dont make the mistakes I do:
1) Dont buy low efficiency speaker, below 98dB.
2) Dont buy 4 ohms speakers.
3) Dont buy 3-ways speakers, prefer Full Range driver crossoverless speakers or at least a simple 2-ways speakers (in this case use a coaxial driver, dont walk run from top tweeters).
4) With a 100dB sensitivity and bening 8 ohms impedance will allow you use a inexpensive sweet small integrated tube amp.
5) Boxed loudspeakers are necessary only to made bass, if possible use a OB speaker.
6) Famous brands means high profit margin paid by the client.
As always IMO.
DIY project from a member:
Eminence Alpha15A + 4.7mH + Visaton B200. 
Decware OB with the Lii Audio F15 driver:

If one have a woodworker is possible try the Lii Audio F15($399/Pair, pair not each) 97dB/8Ω and benign impedance curve suited to OB or Bass Reflex box or the F18($540/pair), no Crossover, no Tweeter beaming, no Phase rotation, no driver sensitivity loss, no Harmonics loss, no Retail price.
http://www.glowinthedarkaudio.com/lii-audio-f18.htmlIf you want a bigger woofer there are 18'' and 21'' from Lii Audio:
https://www.lii-audio.com/product/w-18/
https://www.lii-audio.com/product/w21/Some Circles of interest you may like>
The Fullrange Driver Circle:
https://www.audiocircle.com/index.php?board=128.0The Open Baffle Circle:
https://www.audiocircle.com/index.php?board=90.0The Tube Amps Circle>
https://www.audiocircle.com/index.php?board=144.0