One of the cheapest possibilities to build a good sounding speaker with
also good efficiency and compact dimensions.
I used 19mm thick MDF plates. Within the enclosure I glued a 10mm sandwich
Alu/rubber/Alu on each side, the top and the bottom plate. As damping material
I used wool which mechanics use for cleaning up oil. 20 mm on each plate
is enough. There are no capacitors or any other electronic parts within
the signal path. If you want to reduce the higher frequencies a bit you
might include the parallel connection of 0.68mH and 4.7 Ohm in series with
the speaker. I used this for a while but recently switched back to the
version without any electronic parts.
How does it sound?
It the fantastic location of each instrument or voice. The midrange and hight are superb and even the bass has a wide range. Especially for this small speaker it is really good. O.K you will not feel any punch in your stomache but believe me, you will be impressed.