Just some piccies taken in August, 2006 during a removal of a University C-15HC woofer that I temporarily installed into this cabinet.
This cabinet measures 36"W by 30.5"H by 19"D and is made with 0.75" birch plywood. Internally, it's 9.9 cubic feet.
The whole system comprises a W15FS, W10FSB and Super 3. It was built by a half brother in 1957.
It was given to me in 1973. Several years later, I applied the mahogany veneer as the original was clear varnished.
For more on this system, follow this link.
This curious little fella is a Popple, given to me by a friend way back in '89 or '90. I named him Grumpy because he was found at a thrift store at the bottom of a huge box and was kind of squished. A lady friend said it looked like me in the morning, grumpy. He's become a family member.
Here it is at the time of adding to this page, mid 2017 and some 27 years later and I still have Grumpy, my Freudian friend.
These were taken in June 2017; I wanted the specs on that original W10/FSB for comparison against other 10" Wharfies I have.
Ignore the date stamp in the LMS curves (lower righrt corner); the date in that old '98-ME computer was a year off.
I use that old machine because it has an ISA slot on the mommy board into which is inserted the LMS board. Linear-X has a newer USB powered system but it costs close to $3200 and I just can't justify that. Besides, this older unit still works and the only advantage of the newer unit is that it's portable, which I don't need and also will handle 3 microphones simultaneously, which allows the unit to measure phase and generate pretty waterfall curves. Phase can be calculated but its importance is questionable as there's not much that can be done about it, practically speaking, with a passive crossover network, not to mention the phase shift cause by the aforementioned passive network. With an electronic crossover, relative phase among the speakers can be compensated by time aligning the speakers, as with a slanted front baffle.
An interesting story regarding phase seems appropriate here. Back in the 40's, a Hollywood movie studio using a 2 way speaker system, probably an Altec A7, noticed an audible double click of a tap dancer's shoes. Tracing the source of that double click led the investigators to the loudspeaker system. By moving the high frequency horn which was on top of the low frequency cabinet forward or backward, the double click vanished.
per the SPL vs Freq curve at the bottom of this page, the response is
very similar to all the other tens I have, even those with recently
replaced replacement cones.
A detailed explanation, albeit theoretical, can be found HERE.
Another amazing thing is that the foam annulus is original, dating back to 1956-57 and hasn't dried or rotted. Some foam annuli on vintage Wharfies have turned to goo in that, if compressed, it stays compressed and sometimes will stick to the fingers.
The squiggles around 2khz and 5khz align with those peaks in the response curve.
Perhaps my theoretical explanation (HERE) of the response peaks contains a lot of truth.
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