This might be an outstanding option for me I have a full woodworking shop, build furniture in my spare time and have $60k of french oak dying for a new project. Would it be possible to eloborate in such a way in the forum to provide the details necessary to accomplish B&W (or better) quality using the Ascend CBM-170 or another speaker with better begining drivers for an even better speaker (I am budgeting 3-4k for speakers)? This would allow for some seriously beautiful speakers as an end point for me and certianly the wife would like it better as it would match some of the furniture already built. And perhaps there is an pportunity to increase the speaker quality significantly for the same budget?!?
I should point out for you: B&W sells their drivers and crossover for their speakers to anyone. The price is very reasonable based on my prior inquries. They charge about the same as you would expect to pay for equivalent quality DIY drivers from Madisound or other similar source.
You could for example, build a pair of 705s(or other B&W speakers) using your own cabinets. The catch is, you need to keep the cabinet front and shape somewhat similar and very close(within 1/4") in size, as the crossover was designed with these variables in mind. This extends to width and upper portion where the mid/tweeter reside. You can modify the lower portion, not near the drivers, to increase height or other aspects. You need a local place that sells the speaker you want to build, so that you can measure these physical characteristics. In addition, you would need a Dayton Woofer Tester 3; it's a USB connected tool that measures T&S parameters of the woofer/midbass. This will be required information(T&S Parameters) in order to determine port design and internal volume. Also keep in mind that you could not easily build an 802D, for example, if you bought the drivers/xovers. The shape of the baffle of the mid itself, would be difficult to copy. Then their is the issue of - the 802D uses an advanced cabinet construction to have virtually zero resonances in the passbands of the drivers used in each of the respective enclosure system. If you were to build a cabinet that copied the external shapes closely enough; then if the cabinet were resonant(as most speakers systems are), it would result in a completely inferior speaker as compared to a factory manufactured 802 cabinet system. The 705 mid/tweeter and xover, I think, would be a good starting point, as the enclosure shape is much easier to copy on the upper portion. You could add a high quality woofer and active crossover to an extended length cabinet design for it - making a full size 3 way.
A DIY design is also possible, using your own selection of drivers, but to build a very high quality speaker from your own design requires a vast knowledge of the subjects related to this area of technology. In addition, even most veteran DIYers do not have very high skill in producing speakers that are of high performance in regards to the critical areas as dictated by the scientific studies on human perception in regards to loudspeaker performance, and I don't know of a single DIY design published online that could begin to compare overall to a design like the 802D, for example.
-Chris