Speaker port
wrote in message
oups.com...
Hi,
Can anybody tell me the use of a port (the hole at the back) on the
speaker?
What is the difference between the speakers with port and those
without?
Thanks,
Vasilis
A cabinet with a "hole" is called a vented enclosure.
without is called a sealed enclosure.
as there is the same amount of sound from the back of a driver as from the
front A sealed enclosure has 50% of its sound wasted.
a vented enclosure however has tuned ports (the length and diameter and
position make a BIG difference) to allow the sound out.
In effect. the longer the port the lower the cabinet will respond (providing
teh cabinet is big enough and the driver is capable). However sound at this
frequency is not well defined.
Vented boxes are common amongst pa applications as maximum volume is
required. They are more efficient but lack quality at resonant frequencies
and port tuning frequencies.
There are many other types of cabinet design.
In hifi equipment it is often common to put the port on the back of the
speaker.. it is firing agasint the wall, and reflects around teh rom via the
walls. Its use is barely noticable unless you are putting significant clean
power into the speaker.
Bass reflex.
It really is ALOT more complicated than that.
but thats a general idea.
i dont expect a hundred replies now telling me thats not strictly true.
I do know EXACTLY how they are built and how they work. its my job.
however my assumption is the OP's knowledge in this area requires a straight
forward answer.
Rob
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