User manual PEAVEY DECA 528

[. . . ] APPLICATIONS The Pro 1200 and Pro 1500 drivers are excellent choices for a wide range of sound reinforcement, highlevel playback, musical instrument, subwoofer, and monitor applications. You can restore top performance to your aging instrument amps and speaker systems with these new, high quality loudspeakers. The 15" driver can produce high sound pressure levels down to 40 Hz, while the 12" can be crossed over as high as 4 kHz. ENCLOSURES To assist with the growing interest in home-built enclosure designs, Peavey provides complete parameter data on these drivers as well as several recommended enclosures for each model. [. . . ] 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. Use wood screws or a pneumatic nailer to assemble the enclosure during gluing, to maximize joint strength. Strength of the completed enclosure has a great effect on the bass performance of the finished system. Box panels that aren't stiff enough will vibrate ­ cancelling bass produced by the woofer, and creating unwanted sounds of their own. If your box vibrates or you don't think the box panels are stiff enough, add more bracing. 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. Place the magnet of the woofer in the vented side for improved cooling. A full range of handles, protective corners, cabinet covering, grille materials and crossovers are available through Peavey Accessories. Peavey does not supply hardware required for the manufacturing of flying systems, and recommends that builders should not suspend or fly any enclosure not certified for such applications. 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. 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. Sd: The functional radiating surface area of the cone assembly, in meters2. Vas: Volume of air having the same compliance (springiness) as the driver's suspension. Cms: Restorative force of the driver's suspension in micrometers/Newton. [. . . ] Mms: The total mass of the moving parts of the loudspeaker, including the air load, in grams. 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. [. . . ]