Dovetail – stand mount or bookshelf

A design proposal for a classic 2 way speaker with a solid wood case and an interior case of birch plywood. Veneered bookmatched baffles with rounded over edges for better sound dispersion.

7″ Driver

F3 = circa 30 Hz

Fs = 40 Hz

Maximum SPL (dB): 106

Sensitivity:   87.5 dB woofer

92.5 dB tweeter

Frequency range of drivers 30 – 25,000 Hz

Maximum power input 250W (Driver rating)

Continuous power input 80W (woofer)



The baffle or front will be veneered in the  sawn European hard wood of choice along with solid lippings (edgings) which will allow me to round over the edges for better sound dispersion.  I highly recommend that we book-match the fronts of the speakers so that they will be a mirror image of each other. The baffle has to be veneered and not out of solid as the drivers need to be inset to not create distortion. Solid wood moves over the seasons which would mean the baffle would likely crack where the drivers are if made from solid.
The sides will be made out of solid European hardwood of choice – a contrast to the baffle would be nice. As the sides will be solid I will be able to handcut the dovetails joining them. The dovetails will be narrow and spaced in such a way to add interest and ‘tension’.
Housed inside the solid carcass will be a plywood box, re-enforced to minimise vibrations and also housing a separate compartment for the amplifier.
The  Hypex FA252 Fusion plate amplifier will be used. This is a plate amplifier which in fact houses two amplifiers – one for the driver and one for the tweeter each getting 150Watts
Drivers will once more come from Seas – these are just wonderful. – In some illustrations the drivers have copper detailing this is incorrect – the drivers will have a silver nextel coating.

The driver will be a  Seas  W18NX001 The tweeter a Seas T29CF002

I will program the crossover using DSP – a very flexible and effective way to tune the relationship between the drivers and the box.
The design will be finalised if and when chosen but the dimensions will be circa 57cm high (22.5″), 33cm wide (13″) and 42cm deep (16.5″). A circular bass port of circa 5cm (2″) diameter will be incorporated into the design also.
The baffle sides and back will all be circa 30mm (1 1/4″) thick. This will be a heavy and substantial speaker which will deliver exactly what is needed for such high quality drivers.
For the finish I recommend a wax oil applied to perfection.