15 or not 15? What do you think?

[Stub Mandrel]

1 hour ago, Dan Dare said:

Absolutely. A speaker the size of your thumb or fingernail is not going to reproduce any low frequencies.

 

Unless it's fitted in a well designed horn.

[Bill Fitzmaurice]

Not even. There are four inchers that would give good lows if the horn is large enough, but their small displacement would limit their output. Even horn loaded eight inches is the smallest practical size.