Single, Solid Sound

[SoundCard]

Greetings,
I simply wanted some suggestions for one, mono studio monitor. I want uncoloured sound with a bass down to at least 70Hz.
Thx.

 

[skwee]

Yamaha HS5 5" Powered Studio Monitor | Sweetwater

 

[mjbphotos]

70Hz isn't really bass. It's the low D on a guitar tuned to drop D. WH only 1 monitors? Why 70Hz as a low frequency?