Subs

Subwoofers or Subs are speaker cabinet designed to produce frequencies from approximately 120 Hz down to the a required low limit (rumble filter) of 30 Hz.

Removing this frequency range from the main speakers allows for better efficiency which means higher volumes for the main speakers. With the lower frequencies being more omni-directional, this becomes a factor and needs to be addressed. This is where the loaded horn speaker comes into play.

Some of these types of subwoofers used include:

Front Loaded Horns

• Usually more compact or small in size
• Provides a short to medium throw
• Good definition and easy to time align
• Not as efficient as other designs

Today’s Front Loaded Horn

Altec Lansing 816

70’s Voice of Theater

Folded Horns

• Usually large
• Provides a medium to long throw
• Most efficient design
• Larger than other designs

Manifold

1. Medium sized
2. Provides a medium to long throw
3. Extended low frequency
4. May not sound good at close proximity

Bandpass

1. Medium sized
2. Provides only a short throw
3. Extended low frequency
4. Produces deep bass with smaller driver

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