"John Byrns" wrote in message
...
In article
,
AB9GO wrote:

Speaker designed for use with amateur and two-way radio,
shortwave and
scanner listening.

http://www.soundssweet.com

Look at how it is constructed and buy the parts from
www.partsexpress.com
.
Here are reviews from hams that own this speaker:
http://www.eham.net/reviews/detail/2754

I don't know if I would trust that speaker to "sound
sweet", it is a
"tuned port, bass reflex speaker", and those tend to have
a peaky
resonant bass, not a sweet bass sound. They probably used
the "tuned
port, bass reflex" because the box would have had to be
larger than
their target size otherwise.


Regards,

John Byrns

Bass reflex cabinets are capabl of excellent
non-resonant bass but the cabinet and speaker must be
matched. A bass reflex cabinet is the acoustic equivalent of
a lumped constant impedance matching network of the L type.
At system resonance most of the output comes from the port.
If the loudspeaker Q is too low or if the system tuning
isn't right there will be a ringing at some bass frequency.
Properly designed the system is flat and has low distortion.
A lot of commercial ported enclosures are not really
bass reflex cabinets, just resonant boxes meant to give some
impression of bass where there really isn't any.
Speakers can be _too_ efficient for a bass reflex.
However, the cabinet can still extend the bass and reduce
bass distortion, however an electronic equalizing filter is
needed. All this stuff is in the literature.


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Richard Knoppow
Los Angeles, CA, USA