STD - Socially Transmitted Disorder

Its what all the kids want this summer

• Components

  The two bass drivers are both Magnat-supreme-3000, which peak at 400w, and are low passed at 90hz. These drivers came free, found abandoned in a disused warehouse, dumped and forgotten.

  The four mids are 5 inch 150 watt full range cones, running without filters. These were also free left to rot and thankfully reclaimed from a wrenched car.

  And the latest addition is a pair of MRD 140 tweets, hi passed at 4500hz, running at 100w peak, mounted in a custom built wooden dispersion flare.

  Its all driven by two juice 1200w amps, which are both class d and achieve hi gain with low distortion rates. Both amps are running well below there marks, giving plenty of head room for later additions or upgrades.

  Powered by one diesel car battery, found fly tipped round the back of an estate.

  Design

  This system was designed around twin Magnat-supreme-3000 sub woofers, designed to be a hard hitting system, with considerations to power consumption and size and weight aspects.

  It is an optimized 4th order bandpass design, with tessellating bass drivers to minimize over all width. Its shape is as squat as possible proving a low center of gravity, and optimizing the volume of the front and rear chambers, gives the system its minimal size, then taking into account the total volume for the amps, cones and internal battery, gives the design a total volume of 77.9 ltrs or 77929 cubic cm.

  Adding the flare was an afterthought and not on the original plans, but a worthy one for sure, adding a lot of clarity to the sound as well as throwing it further. The problem i have with buying flares is that essentially its a bit of plastic, even if it boasts ''extra high efficiency and excellent radiation''. Theres no way i am spending 60quid or even 20quid on something i can make for free out of recycled wood. It was constructed with the same mathematical scale as the the MRH 140's [the manufactured flare], at a ratio of 40' / 90'. being the first wooden flare we've tried, i am very happy. its sounds excellent.

  Crit

  Overall this is a banging system, i think it out strips its predecessors in design, the frequency levels are balanced and clear, it sounds very nice, high fidelity audio built out of rubbish.

  Lady's and gentlemen... STD - you know you want one

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• Brief

  Trailer system capable of delivering the goods with out breaking a sweat, whilst following certain guide lines

  -single box, idiot proof

  -2 amps, 2 bass cones, 4 mids/full

  -enclosed battery

  -compact, low c-o-g for cycling

  -access panel locking

  -AP large enough to remove battery and amps via

  -bass cones isobaric or side loaded depends on depth vs width

  -to be built around a trailer

  -vents: rather have rounded but letter box strips fine

  Plan appendix

  -a+b- height and depth are variable to volume, but want it as short as possible, width is fixed to trailer size

  -c- support bracket at 45 degrees, although mids casing might not need to be full length, depending on vol dependency of both speaker sets.

  -d- this is variable,

  depending on vol for bass cone

  -e- what about triple reflect

  -f- need to have enough room to remove battery, fits behind cone, also change amp settings.

  Construction

  All the wood is 18mm ply, whilst adding to the weight factor, dampening the bleed and the overall integrity of the structure is greatly improved. All the wood used in this system was found dumped in an ally, loads of it, and then cycled piece by piece to safety... story - got interrupted in my gold mining by a local resident who thought i was adding to the rubbish pile, the aforementioned resident seemed greatly relieved to see me doing quite the opposite.

  Hatch

  A major problem i have faced in the past, is allowing easy access and maintenance on an 'air tight' chamber, so for this design i fitted a 3 tier hatch. Built with interlocking steps, each segment coated in silicon and heavy duty insulation to act as a buffer. I am very happy with this design, as bleed is minimal to non, its a very tight fit, and can be removed in a matter of seconds via the locking bolts. This design did however come with one draw back, being an afterthought and not on the original plans, the additional cubic volume wasn't accounted for. This system was originally conceived with a removable battery option, but the bottom step of the hatch seal negates this. By 18mm. I was very annoyed at the time. So the battery is permanent, very permanent, could face power issues in the future. But the hatch is great so whatever.