Mike,
That warning dates back to the early days of the K2. Originally no
fiber washers were provided, and several builders tightened the screws
excessively and deformed the speaker frame. That warning has been
present in manuals calling for mounting the speaker ever since.
The screws should be tightened securely, but not "beefed down" such as
to squeeze the fiber washers enough to deform them - and that will
deform the speaker frame.
Like Wayne, I have not heard of this problem with the K3 or the K3S and
have not heard of similar problems with the K2 after the fiber washers
were introduced. There is an occasional bad speaker encountered, so I
would tend to believe this is a "one-off" case of a bad speaker.
There *are* two different thicknesses of fiber washers used in Elecraft
kits. The thinner ones are used on the K2 PA mounting hardware, and the
thicker ones are used for mounting the speakers. Perhaps Steve was sent
the thinner fiber washers with his kit (that is only a guess on my part).
73,
Don W3FPR
On 12/5/2015 4:35 PM, [email protected] wrote:
I have an older K3 and a spare speaker (part #E850300). Its hard to imagine flange being
bent with little 4-40 screws, BUT, in my assembly manual p52, last step above Figure
74,it states in BOLD lettering, "Do not tighten the screws enough to bend the
speaker flanges!"
IF this were not an issue sometime in the past, one wonders why such a warning
would be stated in bold letters? Otherwise I find the little speaker to be
as Wayne describes in his reply. Steve could you really be the first out of
so many thousands to actually bend the flanges?
73,MikeAC5P
On Saturday, December 5, 2015 2:11 PM, Wayne Burdick <[email protected]>
wrote:
Hi Steve,
Sorry to hear about this. I've never heard this complaint before (and there are
tens of thousands of these speakers in use, in both the K3 and K3S). The frame
should not bend if the correct fibre washers are used and the hardware is not
over-tightened. I'll check with our manufacturing lead to see if the wrong ones
were shipped.
I'll also check with our tech writer. Perhaps the instructions could be
clarified.
The internal speaker is certainly of high quality, so I hope you can get one
installed (I'm sure customer support will send another, given your issues). It
has excellent sensitivity (95 dB SPL, due in part to the very large shielded
magnet) and a wide frequency response range. Given the large top cover mounting
surface, the internal speaker is quite loud, with a low natural resonance point.
73,
Wayne
N6KR
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