I have an original color brochure on the entire Wharfedale speaker line at this time, and a 1 sheet product spec sheet. I will post the one-sheet. There were 3 or 4 different models of the W70 series that were released over a period of time through mid to late 1960's (please correct me if I am wrong here). There was the 3 driver model (the one with the white speaker cloth, looks like W90 cosmetics) then 2 different 4 driver models (I have both), one that is front loaded and the more common rear loaded model W70D MKII. The enclosures are the same design, however they have a different exterior binding post design on the rear panels. The earlier model has plastic colored binding post screws while the later model has the metal type. and the pots are mounted vertical vs. horizontal on the later model. The crossover appears to be the same with two 50 ohm 8 watt pots and 4uf and 16uf 50 volt caps both models. The subs are the same I believe, but the drivers appear to be different (at least cosmetically) on both models. The front speaker cover/panels differ with the type of material used and structure of panel. The earler model has a sort of plastic straw type woven cover with the Wharfedale logo in the upper right hand corner is framed in solid wood and uses metal inserts to snap them in place (sturdy but very difficult to remove) and the "Polynesian" carved motif on the frame. The later model uses a woven fabric design mounted to press-board and the Wharfedale badge is on the lower right hand corner and the cover attaches via velcro pieces stapled to front panel. The badges are different too: early model is metal with a silkscreened "W" on the square badge, while the later model has the entire Wharfedale name in raised lettering and is plastic and rectangular. Both have a polynesian type pattern in the design and are each different. The earlier model is laminated on the frame of the speaker cover, while the later one is carved in the cabinet itself, both framing the inside of the front panel. The earlier model came with a much darker finish while the later model has the lighter finish most commonly seen. Both were veneered walnut cabs. I prefer the last model the W70D MKII both cosmetically and for the driver configuration being a rear loaded design. The front loaded design is very difficult and awkward to work on. The drivers are mounted on piece of particle board about 3/4 inch thick with wires trailing back to the crossovers which are burried under some speaker baffling material in 2 different locations (upper back panel & top of cabinet in back). If you are not careful, due to the weight of the panel with the drivers, if you slip while removing it you can tear the wires loose either from the drivers or the crossovers (there are 2). Also,The length of the wires is not long enough to allow you to work inside the cab, let alone move the panel to the side to rest. The later model has a removeable rear panel that is sand filled and the single crossover is mounted on the inside of this panel with the wires then running to the drivers directly. Still, not enough wire to give you some work room, but a much better design, easier to do soldering on the crossover, and less cumbersome and awkward to work with. I added some wire to both models which allows more room to work on if needed. When re-capping with the PIO caps I mounted them on the rear panel next to the crossover with some shallow srews so as not to leak the sand. The earlier model was a real bitch to do soldering to crossover. That's about it. Hope this helps.
