My total investment was $800inc in drivers, $60inc in MDF timber, probably $150 in misc items and $200inc in Symetrix DSP All up I spent about roughly $1300inc gst + a decent whack of my time.In the last couple of month I have tried to find a solution for the incomparable 15'' Tannoy driver to be used in a sort of universal enclosure. In hind sight the mid enclosure should have been larger, and the enclosure volume for the bass driver should have also been larger to provide better extension. It doesn't sound as good as I would have liked, but you only learn from experience. Would I have done things differently if I had my time again? Sure a few.
The 12.5.1 is my first DIY speaker active or passive, and the cabinet finish is excellent especially considering my minimal speaker building knowledge, wood-working skills and the overall monetary investment made. I must say I am actually quite proud of myself looking at the completed speaker. All work was completed by myself on the weekends between my normal 9 to 5'er. Of this time 6 months was dedicated to design and procrastination, while the actual physical build process only took 3 months. The 12.5.1 3 way active speaker build took about 9 months to complete. As expected the plot is essentially identical to the 75 litre plot completed during the cabinet design phase. based on the above 76 litre net enclosure volume calculation. Just for consistency I have remodeled the SB acoustic 12inch. (106.7 - 30.794) = circa 75.9 litres, with extras I anticipate total usable volume will be 75 litres exactly. So to calculate a final working volume, I now need to take overall cabinet volume and subtract all calculated/known reductions. Type 4 1 x Woofer 18mm fixing brace behind cutout .1 litre Slot Port (54x344x325mm).6 litres (outside dimensions) You will note, I did not measure the tweeter displacement, because its net displaced volume is negligible.
OK, so now that I have the displacement figures for both the mid and woofer, I can reconcile the volume of the main cabinet.
The displacement calculator in this instance, spits out 2.47 litres displacement.
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