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Port bungs
WARNING:
Care must be taken not to insert the port bungs too far into the port, as this may result in the foam bung
being lost inside the cabinet.
If the loudspeaker is to be installed in a small room, typically 9 sqM ( 80 sqFT), or a room known to reproduce accentuated bass
response, it may be desirable to fit port bungs. However, experimentation is recommended with positioning of the loudspeaker
in the room prior to fitting. To optimise performance from the loudspeaker it is important to ensure the loudspeaker is not
positioned too close to a wall or near the corners of a room (refer to the suggestions on pages 2 and 3).
If the positioning of the loudspeaker is predetermined by room aesthetics or layout, or you find you have accentuated bass,
please read point 1 for the MR1 & MR2 and point 2 for the MR4 & MR6.
1. Where bookshelf/ stand-mount speakers (MR1 & MR2) are to be sited in close proximity (less than 8 inches/ 20cm) to a
rear wall (such as on a bookshelf, wall mounted, positioned in a cabinet or on a stand close to a wall), we recommend
experimenting with fitting port bungs into the ports. This will reduce the bass ‘boom’ sometimes termed as “overhang”,
and assist the loudspeakers to reproduce their best performance under these environmental conditions. ‘Boom’ is
generally caused when bass energy from the loudspeaker ‘excites’ room modes and causes an accentuation at a particular
frequency, or number of frequencies.
2. Where floor-standing loudspeakers (MR4 & MR6) are to be sited in close proximity (closer than 18 inches/ 45cm) to a
rear wall, we recommend experimenting fitting the port bungs. This will reduce the bass ‘boom’ sometimes termed as
overhang and assist the loudspeakers to reproduce their best performance under these environmental conditions. This
is caused when bass energy from the loudspeaker ‘excites’ room modes and causes an accentuation at a particular
frequency, or number of frequencies.
3. When fitting port bungs the overall bass extension will not be reduced, however bass energy/ output around the port tuning
frequency will be reduced. This has the effect of reducing bass ‘boom’ while increasing bass clarity and apparent agility.
Experimentation is highly recommended.
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