|8th December 2005, 09:32 PM||#3|
Join Date: Mar 2005
it is 150cm long and 2cm wide.The aluminium is 4 my glued to 15 my paper.It is korugaited along the 150cm not on the 2 cm.And then it is closed ind the sides.crossover point 200hz.
|3rd March 2006, 09:22 AM||#9|
Join Date: Jun 2005
Location: Neuss, Germany
Magnetic field strength
from a friend I borrowed a gaussmeter which measures the strength of magnetic fields with a probe small enough to be positioned in the gap of my ribbon speakers. Here are my findings: Fortunately the field is
a) highly concentrated in the gap
b) linear across the length of the gap; linear part begins after half of first magnet block (some 10 mm) so that total homogeneous field ist just one neodym block shorter than magnet row (9 out of 10)
c) as far as the old gauge is correct field is strong at some 0,5 Tesla (5000 Gauss) in the middle of a 12 mm wide gap between double rows of magnets - see foto.
By the way: I also tested if the field is influenced by the addition of iron pieces across the ends of the frame to close the magnetic flux in the rear of the ribbon. Varnhagen seems to be right in his finding that this doesn't make much of a difference in efficiency - I could hardly see a deflection of the meter pin.
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