15 or not 15? What do you think?

[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.

[Stub Mandrel]

19 hours ago, Bill Fitzmaurice said:

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.

 

For portable amps. A few inches is enough for permanently installed horns, like they used to use in cinemas.

[Bill Fitzmaurice]

Said horns were typically loaded with fifteens. For instance the Altec A7, or going back further the Shearer horn.