Timber Nooks Transducer Theory Loudspeaker Design Matthew Nanney FA 4740: Transducer Theory March 8th, 2014 Table of Contents FUNCTIONAL DESCRIPTION .............................................................................................................................. 4 GOALS .......................................................................................................................................................................................... 4 ENVIRONMENT ........................................................................................................................................................................... 4 LISTENING PURPOSE ................................................................................................................................................................. 4 VISUAL AESTHETICS .................................................................................................................................................................. 4 SPL OUTPUT ............................................................................................................................................................................... 5 SUBJECTIVE DESCRIPTION OF SOUND QUALITY ................................................................................................................... 5 PRIORITIZATION ........................................................................................................................................................................ 5 TECHNICAL GOALS ............................................................................................................................................... 6 SIZE .............................................................................................................................................................................................. 6 SPL ............................................................................................................................................................................................... 6 FREQUENCY RESPONSE ............................................................................................................................................................ 8 COLORATION, TIME RESPONSE ............................................................................................................................................... 9 DIFFRACTION AND SPEAKER SHAPE ................................................................................................................................... 10 CROSSOVER .............................................................................................................................................................................. 10 DRIVER SELECTION .......................................................................................................................................... 12 WOOFER SELECTION .............................................................................................................................................................. 12 Dayton Audio RS180-8 7” Reference Paper Woofer ............................................................................................ 12 SB Acoustics SB17NRX35-8 6.5” Woofer ................................................................................................................. 13 ScanSpeak Classic P17WJ00 6.5” Woofer ................................................................................................................ 14 SB Acoustics SB17MCF35-8 6” Woofer ..................................................................................................................... 16 SB Acoustics Satori MW16P-8 6.5” Woofer ............................................................................................................. 17 TWEETER SELECTION ............................................................................................................................................................ 18 Tang Band 25-1742S 1” Tweeter ................................................................................................................................ 19 Morel CAT 308 1 1/8” Tweeter ..................................................................................................................................... 20 Dayton Audio RS28F-4 1 1/8” Tweeter .................................................................................................................... 21 SB Acoustics SB26STAC 1” Tweeter ............................................................................................................................ 22 SEAS 29TFF/W 1 1/8” Tweeter ................................................................................................................................... 23 TESTING AND TUNING ..................................................................................................................................... 24 WOOFER PERFORMANCE ...................................................................................................................................................... 24 TWEETER PERFORMANCE ..................................................................................................................................................... 25 CROSSOVER PERFORMANCE ................................................................................................................................................. 26 OVERALL PERFORMANCE ...................................................................................................................................................... 27 FINAL TESTING RESULTS ................................................................................................................................ 28 OVERALL LOUDSPEAKER PERFORMANCE – LEFT SPEAKER ........................................................................................... 28 FreQuency Response .......................................................................................................................................................... 28 Integrated FreQuency Response ................................................................................................................................... 28 Harmonic Distortion ......................................................................................................................................................... 29 Minimum Phase ................................................................................................................................................................... 29 Horizontal Off-Axis Response ........................................................................................................................................ 30 Vertical Off-Axis Response .............................................................................................................................................. 30 Difference Plot ..................................................................................................................................................................... 30 Step Response ....................................................................................................................................................................... 31 Integrated Step Response ............................................................................................................................................... 31 Impulse Response ............................................................................................................................................................... 32 Waterfall Plot ....................................................................................................................................................................... 32 2 OVERALL LOUDSPEAKER PERFORMANCE – RIGHT SPEAKER ........................................................................................ 33 FreQuency Response .......................................................................................................................................................... 33 Integrated FreQuency Response ................................................................................................................................... 33 Harmonic Distortion ......................................................................................................................................................... 34 Minimum Phase ................................................................................................................................................................... 34 Horizontal Off-Axis Response ........................................................................................................................................ 35 Vertical Off-Axis Response .............................................................................................................................................. 35 Difference Plot ..................................................................................................................................................................... 35 Step Response ....................................................................................................................................................................... 36 Integrated Step Response ..............................................................................................................................................