User manual PEAVEY DECA 424

[. . . ] For best results, enclosures should be built of best-quality marine or other high grade plywood. If you must use construction grade plywood, inspect each sheet thoroughly - and do not use anything below BC grade. Use 3/4" thick material throughout, as thinner wood virtually guarantees poor enclosure performance. Look at commercially designed enclosures for ideas on good brace placement. [. . . ] Vents used in the examples require standard Schedule 40 PVC pipe for vent construction. The pipe should be dadoed tightly into the back of the baffle and glued firmly in place with high quality epoxy or high strength (1) 6/152 5. 5/140 81 48-140 Sheffield Pro 1500 Small sealed box Small vented box Medium vented box Large vented box 1. 25/35. 4 2. 0/56. 6 3. 0/85. 0 4. 0/113. 3 n/a (2) 3/76 (2) 3/76 (2) 3/76 n/a 4. 5/114 4. 125/105 3. 5/89 89 (resonance) 50 42 38 68 60 50 45 Single reflex bandpass Sealed 2. 3/65. 1 Vented 1. 7/48. 1 (2) 6/152 8. 625/219 80 43-145 For Sheffield 1200: 1. Great choice for use in a super-compact stage monitor or as a mid-range enclosure. Amazing portability, with high sound quality and maximum power handling. Adequate bass performance ­ a great choice for the vocal range. Popular size for a 12" system, with an excellent mix of power handling and bass quality. Maximum bass performance from this 12" speaker. Power handling is reduced by about 15% due to enclosure size. Special enclosure design that uses the enclosure as an acoustic filter for shaped response. Great choice for a compact subwoofer system. Small sealed box Tiny 15" enclosure ­ makes a terrific stage monitor. These instructions are a general guideline for design. Proper construction techniques, good planning and common sense will result in a reliable, high quality, high performance system. Peavey in no way accepts liability for any damage, accidents or injury that may result from construction or use of enclosures using this information. PARAMETERS Thiele-Small parameters for Sheffield® ProTM 1200 and Sheffield Pro 1500 drivers follow. This data is for use in designing enclosures. Numerous software packages are available that use this data to simulate the response of the driver and enclosure together for optimum performance in any application. PARAMETER DEFINITIONS Znom: The nominal impedance of the driver in Ohms. Revc: DC resistance of the driver in Ohms, also known as Re. Sd: The functional radiating surface area of the cone assembly, in meters2. BL: Efficiency of the voice coil and magnet system in Telsa Meters. Fo: Also known as Fs, the free air resonance of the driver. Vas: Volume of air having the same compliance (springiness) as the driver's suspension. [. . . ] Qms: Resonance characteristics of the mechanical factors of the loudspeaker. Qes: Resonance characteristics of electrical factors of the loudspeaker. Qts: Resonance characteristics of the electrical and mechanical factors combined together. Xmax: Distance the cone can move in one direction before the coil begins to leave the magnetic gap. [. . . ]