Bass Vs speaker efficiency

Not many things in audio depend on just one other thing. Being connected, most things depend on being connected to something. But there must be at least a half a dozen things I have done that have made the bass tighter and more articulate but had nothing to do with efficiency. So the answer is no.

“Tight” bass no. But efficiency and box size have a relationship for deep bass. The pressure increases faster in a smaller box and the driver has to work harder to overcome it. 

'Tight' bass is a coloration and has nothing to do with efficiency.

I think when many people refer to “tight” bass they are trying to express a juxtaposition to the perhaps more common “loose bass”.
 A sealed box will often provide tighter bass than a ported box, but if comparable bass output is to be achieved, the sealed box will typically do it with less efficiency.

I think when many people refer to “tight” bass they are trying to express a juxtaposition to the perhaps more common “loose bass”.

Its a good point. I've just not heard 'tight bass' in real life, only in stereos.