Why do horns handlice twice the power?

Why do people say basshorns handle twice the electrical power of, for example, a vented box subwoofer?

Re: Why do horns handlice twice the power? - Walt 04:06:45 10/31/03 (1)
- Transformation - Wayne Parham 04:33:21 10/31/03 (0)
They don't - Wayne Parham 12:19:02 10/30/03 (9)
- hmmm but - toxicport.e 17:21:11 10/30/03 (7)
  - Voltage and Power - Wayne Parham 23:17:37 10/30/03 (6)
    - Re: Voltage and Power - toxicport.e 01:48:07 10/31/03 (5)
      - Re: Voltage and Power - Wayne Parham 02:24:49 10/31/03 (4)
        
        physics-no cheating allowed - toxicport.e 04:17:28 10/31/03 (3)
        
        Re: physics-no cheating allowed - Wayne Parham 04:51:58 10/31/03 (2)
        
        Simple (very) math - JLapaire 12:18:46 10/31/03 (1)
        
        Re: Simple (very) math - Wayne Parham 15:13:56 10/31/03 (0)
- Re: They don't - Adam 15:55:03 10/30/03 (0)