<strong>CONSTRUCTOR</strong> <strong>SERIES</strong>: 2-<strong>Way</strong> <strong>Trapezoidal</strong> <strong>12</strong>" <strong>Reflex</strong> EnclosureAll dimensions are in millimetresFront View396270Section C’-C’404C"414 HOLES 08.0ON 318.0 PCD1<strong>12</strong>A'A"B'73270600B"18450281.0201C"PORT TUBE100mm I.D.78Section A’-A’1818Section B’-B’242 ref.38618186018104578.75°340 ref.348 ref.Panel cutting guide600SIDEPANELQTY 2600BACKPANELQTY 1600FRONTBAFFLEQTY 1404235TOP+BOTTOMPANELQTY 211°SIDEPANELBRACEQTY 232845346334FRONTBAFFLEBRACEQTY 11811°11°394242348396181428146011°11°11°11°11°11°<strong>Fane</strong> Acoustics Ltd. Unit 1, Millshaw Park Avenue Millshaw Park Industrial Estate Leeds LS11 0LR, EnglandTel: +44 (0) 113 277 8600 Fax: +44 (0) 113 277 8700 e-mail:info@fane-acoustics.com www.fane-acoustics.com<strong>Fane</strong> Acoustics Ltd. operates a policy of continuous product developmentand reserves the right to change specifications without notice.
<strong>CONSTRUCTOR</strong> <strong>SERIES</strong>: 2-<strong>Way</strong> <strong>Trapezoidal</strong> <strong>12</strong>" <strong>Reflex</strong> EnclosureHints and TipsChoice of timberWe recommend multi-layer 18mm Birch plywood as the best materialto withstand the rigours of intensive ‘life on the road’ or likelyexposure to damp conditions. Alternatively, 18mm Medium DensityFibreboard (MDF) offers good acoustic properties with the advantageof being less expensive ( although heavier ), and may be used wherethe cabinet will be permanently installed in a dry environment. Bothmaterials accept any type of paint finish extremely well.Construction techniqueAll joints should be totally airtight, liberally glued with PVA adhesiveand screwed at 200mm (8”) centres with 4.2mm or 4.8mm (No.8 orNo.10) x 50 mm (2”) self-tapping screws.The bracing panels are designed to ensure rigidity of construction,making the cabinet as free as possible from panel resonances causedby the internal forces generated by the loudspeaker drive unit andresulting in unwanted vibration and colouration of the sound. Again,these joints should be glued and screwed using the same method.PortingThe length of the ports as specified in the drawing should be strictlyadhered to. The cut-out size for the port is 100mm (4”). Plasticdrainpipe is ideal for this task, but as there could be slight variationsin pipe diameter we suggest the cut-out is made after purchasing.The port when fitted should be airtight, which can be achieved bysealing the joint with silicone sealant or polyurethane mastic.Acoustic insulationTo aid panel damping and prevent internal reflections and standingwaves, all internal panels of the cabinet ( with the exception of thefront baffle ) should be lagged with acoustically absorptive material.We recommend the use of acoustic foam wadding, glassfibreinsulation or rubber carpet underlay which should be glued, stapledor tacked to the inside of the cabinet, taking care to ensure that porttubes are not obstructed.Crossover networkBoth the Colossus <strong>12</strong>MB and the Crescendo <strong>12</strong>MB will give superbperformance when used with appropriately matched custom designedpassive crossover networks. The recommended <strong>Fane</strong> crossovernetwork for this design incorporates a substantial heatsink to protectthe HF unit from overload. All the crossover components should bemounted as far away as practical from the magnets. Major damage toboth the crossover and drive units could result should the boardbecome loose during transit, therefore the crossover should bemounted firmly to an inside wall of the cabinet, ideally secured usingself-tapping screws in screw cups to reduce the pressure exerted onthe circuit board, and spaced with rubber grommets between thecircuit board and cabinet wall. It must however be pointed out thatdue to the high power handling capabilities of these drive units, someusers may wish to employ an active crossover in order to utilise thefull potential of these drivers.Internal wiringWiring should be kept away from moving loudspeaker parts andfastened to internal panelling to avoid buzzing. We encourage the useof colour coded wiring to identify polarity (red for +ve and blackfor -ve), and recommend carrying out a phase check before firstusing the cabinet. This is achieved by applying the positive terminalof a battery to the positive cabinet input which should result in thespeaker cone moving forwards if in phase (or by using a dedicatedpolarity checker).Drive unit fixingThe drive unit should be front mounted to the baffle using T-nuts andfixing bolts, and is supplied with a length of self adhesive foamsealing strip which should be fitted around the front edge of thespeaker cut-outs to guarantee airtight conditions.Loudspeaker protectionThe exposed front of all speaker drive units is of course vulnerable todamage, necessitating some means of protection which must berobust but acoustically transparent. Cloth/foam type grilles arefeasible for fixed cabinets, but a metal mesh grille is certainly thepreferred and superior option. It is recommended that a foam gasketmaterial is used between the wooden cabinet and the metal grille toprevent any unwanted resonances.Cabinet hardwareHandles, terminal panels, protective corners, pole mountingaccessories etc. are readily available from many different sources.<strong>Fane</strong> Acoustics will be pleased to recommend approved suppliers ofall associated components.Cabinet finishingCabinet finishing is largely a matter of personal preference and assuch, detail of this is omitted from the drawing. Generally cabinetsare either painted or covered in carpet or vinyl material. If a carpetmaterial is chosen it is recommended that a very dense tight piletype is used and that metal corner protectors are fitted. Cornerprotectors will have a defined radius that the edges of the cabinetshould be finished to. The cabinet shown on the first page of thisdocument has all the external edges routed with a 13mm radius andcoated in a hard wearing textured epoxy paint. A single top rearmounted carrying handle has been fitted. There are various types ofhandles and terminal panels available and again details of these havebeen omitted. It is recommended that these be purchased and cutoutsbe made in an appropriate position in the panels before finalbuild. Be aware that handles and terminals are not necessarilyairtight, which will be detrimental to performance but can be easilyremedied using a silicone sealant or polyurethane mastic toseal all joints.Warning!There are safety regulations regarding the installation of loudspeakersystems. This document is intended as a guide to construct asuitable acoustic enclosure for our components. <strong>Fane</strong> Acoustics canhold no responsibility for the structural integrity of the finishedsystem. The system will be no stronger than the material it is madefrom and the joinery techniques used to assemble it. Suspending thefinished system will require additional hanging hardware. There arecompanies who specialise in the manufacture and correct use of thishardware. They are experts and must be consulted if overheadsuspension of the finished system is intended.<strong>Fane</strong> Acoustics Ltd. Unit 1, Millshaw Park Avenue Millshaw Park Industrial Estate Leeds LS11 0LR, EnglandTel: +44 (0) 113 277 8600 Fax: +44 (0) 113 277 8700 e-mail:info@fane-acoustics.com www.fane-acoustics.com<strong>Fane</strong> Acoustics Ltd. operates a policy of continuous product developmentand reserves the right to change specifications without notice.
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