Download Infinite Baffle Enclosures

Sarvajanik College of Engineering & Technology
Audio Video Systems
Topic: Different Baffels And Enclosures
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Asim Merchant
Eric Modi
Urja Kantharia
Harsh Kosambia
Baffles and Enclosures
• Rigid flat material used to extend the edges of a
loudspeaker cone is calles “Baffle”.
• When a loudspeaker is mounted in a closed box with an
opening in the front the box serves the purpose of infinite
baffles because the waves from the back of the cone will
not be able to come to the front side. Such a closed box is
known as “Enclosure”.
Types :
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Finite Baffle
Infinite Baffle
Bass Reflex
Horn enclosures
Multiple entry horn
Finite Baffle
• The wooden cabinet as in radio receiver or T.V. receiver act as
‘Finite Baffle’. Such baffles, being of finite size, are not very
effective and do cause some loss of low audio frequency
signals due to diffraction.
• Infinite Baffle Enclosures - Also
called Flat Baffles, generally used with in-wall or ceiling
mounted speakers, will provide front-to-back
speaker isolation while using close to an infinite amount
of air space as the enclosure.
• Bass Reflex – Also called Vented Box
Enclosures, are used when extended low frequency output
is required. A port (vent) is added to an otherwise sealed
enclosure and the port ID and length - together, create
a Helmholtz resonance that reinforces the systems’ low
frequency output.
Acoustic Labrynth
• For very low audio frequencies(16Hz to 50Hz), the ordinary
bass reflex enclosure will have large dimension. To solve the
difficulties the enclosure is divided into parts by several baffles
forming ducts. This lengthens the path of wave coming out of
the port and causes additional phase difference of 180 degree
at very low audio frequency so that two waves meet in the
same phase.
This ducted enclosure is
Acoustic labrynth
• Horn enclosures
A horn loudspeaker is a speaker system using a horn to
match the driver cone to the air. The horn structure
itself does not amplify, but rather improves the coupling
between the speaker driver and the air. Properly
designed horns have the effect of making the speaker
cone transfer more of the electrical energy in the voice
coil into the air; in effect the driver appears to have
higher efficiency
• Multiple entry horn
The multiple entry horn (also known as a coentrant
horn, unity horn or synergy horn) uses several different
drivers mounted on the horn at stepped distances from the
horn's apex, where the high frequency driver is placed.
Depending on implementation, this design offers an
improvement in transient response as each of the drivers is
aligned in phase and time and exits the same horn mouth.
Thank you