After a friend posted a copy of the original 1976 BBC LS3/5A design report, I thought it might be an idea to try and replicate this design using available or home made components and see if a pleasing result could be achieved.
The original LS3/5A is a straightforward design. A fully sealed 310x190x160 mm box houses a 5" bass driver and a 3/4" dome tweeter. A passive crossover (3rd order Butterworth, 3kHz) links the two units.
Getting started was easy, I needed a parts list, or Bill of Materials (BoM). The breakdown of the sub sections is like this:
- Woodwork - Shell, baffle, back, grill frame
- Drivers - Bass, treble units
- Crossovers - capacitors, inductors, wiring board
- Miscellaneous - terminals, cable, grill cloth, felt, oil, paint, velcro, badges, screws, glues, putty, polish
I began by purchasing the major components and starting into the woodwork.
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