Posting pictures will go a long way in helping you determine what you have.As you are a new member you may have to wait a couple days.But anyway "Welcome to the Board"
Old style(60's) on the left, new style(70's) on the right.
Thanks for the welcome!
Bowtie's pictures illustrate the external differences perfectly. I have different rear caps on the rough units though. Also I ( mistakenly?) reversed the dating. I took a fait little stamp on the side of the polepiece for a date code. That suggested 60 something for the rough ones (right in the pic above) and 70 something for the other ones.
I am still curious about the weight difference. Is is due to a smaller magnet, less casing material or both?
The lighter, smaller and smooth units do seem to have a little less output, yet sound fine nevertheless.
The later 802s used a cast pot structure rather than one welded from pipe and plate stock. Dare I suggest that this was likely a cost saving measure, as with the Tangerine phasing plug? I do know that the cast pot assemblies on JBL cone speakers were begun in 1953 as a cost saving measure.
They are both rated at 15,250 Gauss and both should weigh the same at ~7 lbs, but the later 802G design has its BW shifted up a little higher to make it better overall with the M19's ~1200 Hz XO as well as do a better job of reproducing the increased HF BW output around that time. The trade-off is that the 'G' isn't as strong down low when XO'd at 500 Hz which with today's very low output impedance systems is actually a good thing overall.Originally Posted by Coendert2011
GM
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
According to my converter 7lbs is 3,175 gram.
The slightly smaller smooth units weigh about 2,550 gram or 5,62 lbs.
They are not the 'tangerine' g version, but have ordinary circular slots. I xo around 750 hz with a second order LR.
I will try to make some illustrative photos and post them here (if possible).
The slightly smaller smooth units weigh about 2,550 gram or 5,62 lbs.Those are 804/806/807 motors NOT 802/808 motors.The lighter, smaller and smooth units do seem to have a little less output, yet sound fine nevertheless.
In a 802 casing?
As I understand the 804 etc casing is even smaller....
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