[Elecraft] KX3 speaker problems

[Michael Thompson]

Having been reading all of the post concerning speaker buzzing and vibration.

I have just received my KX3 kit and spent alot of time examining and getting the
specification for the speaker then proceeded with the assembly.

A little history about myself:
	I work in the aviation industry (roughly 30 years), I do instrument repair work (electronic and mechanical)
	most of my work is mostly for Cessna citation jets (owners and pilots can be very picky)
	I have been messing with electronics for about 45 years

I have completed assembly and have made the following observation:

1) Quality control by the manufacture
	(not sure on there inspection process, I have checked the cone hight with a straight edge
	like done in the assembly manual for the LCD hight check)

2) VFO shield touching rear of speaker
	this causes excessive case vibration, can be cured by placing a piece of rubber
	(like what is used as the speaker gasket) between VFO shield and rear of speaker
	(adhesive back stuck to VFO shield before installation and tightening of VFO encoder)

3) RX EQ set improperly
	cut 50Hz to -16, cut 100Hz to -4, 400Hz to 0, 800Hz to +1, 1600Hz to +4, 2400Hz to 0 and 3200Hz to 0
	(this helps compensate for speaker frequency curve and cuts the bass out that will cause vibration
	and distortion, if would like to boost frequency for CW operation boost 400Hz and 800Hz by +4)

4) Kit packaging
	(piece of thin cardstock taped to front of speaker to keep the cone from becoming damaged
	by other parts in the bag/box during shipping)

I hope this can help you as I do this for living everyday.

73, Michael - N8NOC

K1-4   #3046
K3/10 #6596
KX3    #1573
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