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HomeMy WebLinkAboutSound Level PressuresREC~~~ Customer Driven Memo Nov ~ ~ zoo CITY CFG~tE ~;~~ _ CITY CLERKS OFFICE 1C1.~'~-`!`L~`4 ~`'~ Rc: Drive-Thru Sound Pressure Lcvcls From the Menu Board or Speaker Post The sound pressure levels from the nleml board or speaker post are as follows: I. Sound pressure level (SPL) contours (A weighted) were measured on a typical HME SPP2 speaker post. The test condition was for pink noise set to 84 dBA at 1 toot in front of the speaker. All measurements were conducted outside with the speaker post placed 8 feet from a non-absorbing building wall and at an oblique angle to the wall. These measurements should ^ot be consn-ued to guarantee performance with any particular speaker post in any particular environment. They are typical results obtained under the conditions described above. 2. The SPL levels are presented for different distances from the speaker post: Distance from the S Baker (Feet) SPL (dBA) foot 84 dBA ? feet 78 dBA 4 feet 72 dBA 8 feet 66 dBA 16 feet 60 dBA 32 feet 54 dBA 3. The above levels are based on factory recommended operating levels, which are preset for HME components and represent the optimum level for drive-thru operations in the majority of the installations. Also, HME incorporates automatic volume control (AVC) into many of our Systems. AVC will adjust the outbound volume based on the outdoor, ambient noise level. When ambient noise levels naturally decrease at night. AVC will reduce the outbound volume on the system. See below for example: Distance from Outside Speaker Decibel Level of standard system with 45 dB of c-utside noise without AVC Decibel Ie~~cl of standard system with 45 dB of outside noise with AVC active 1 foot 84 dBA 60 dBA 2 feet 78 dBA 54 dBA d feet 72 dBA 48 dBA 8 feet 66 dBA 42 dBA 16 feet 60 dBA 36 dBA If there are any further questions regarding this issue please contact HME customer service at ] -800-848-4468. Thank you for your interest in HME's products HM Electronics, Inc. ~ 14110 Stowe Drive ~ Poway, CA 92064 phone: 800.848.4468 ~ fax: 858.452.7207 ~ www.hme.com ~i/ Quiet Solution Maximum Exposure per day (OSHA) Sound level Decibel Level Examples No Sound 0 Threshold of hearing...essentially no sound 10 Breathing 15 A soft whisper in someone's ear. Very Quiet 20 Whisper, rustling leaves 25 Recording Studio 30 Quiet rural area, Very quiet library. 40 Very Quiet Residence 45 Typical neighborhood. Quiet 50 Quiet suburb, conversation at home, Private office 60 Normal conversation (3-5 feet, sewing machine, typewriter. Anhoying 70 Freeway Traffic at 50 feet, vacuum cleaner 75 Typical car interior on highway Loud 80 Garbage disposal, dishwasher, average factory, Telephone dial tone, Noisy office 16 hours 85 City Traffic (inside car). 8 Hours 90 Power drill, shop tools, Busy urban street, diesel truck, food blender 6 Hours 9Z Clarinet, Oboe at 10 feet 4 Hours 95 Subway train at 200 feet 3 Hours 97 French Horn at 10 feet 2 Hours Very Loud 100 Jet takeoff 1000 feet, Outboard motor, farm tractor, garbage truck, Very heavy Traffic 1.5 Hours 102 Motorcycle 1 Hour 105 Power mower 108 Home Theater (loud peaks) 0.5 Hours 110 Chainsaw, pneumatic drill, typical rock concert, Steel Mill, riveting, auto hom at 3 feet 0.25 Hours 115 Jackhammer 0 Hours Pain threshold 120 Loud thunderclap, typical live rock music Hearing damage occurring 125 Pneumatic riveter at 4 feet Ear drum distortion 130 Jet takeoff (300 feet), Noise level during a stock car race. Permanent hearing damage 132 Very loud rock concert, 50 feet in front of speakers 140 Gun muzzle blast 140 Prop aircraft on takeoff, gun muzzle blast, aircraft carrier deck, jet engine at 100 feet Eardrum rupture 150 Jet takeoff 75 feet 155 Shot from a handgun (.38 or .44) at 1 foot 160 Jet aircraft on Takeoff at 30 feet Immediate death of tissue 180 Jet engine at 1 foot 194 Loudest sound in air, air particle distortion (sonic boom) © 2003 Quiet Solution, Inc. C N cd ro U O .~ p. O U N "~ 0 a~ .~ U Q vi T ~_ ~ O ~ L O C_i M ~ O ~ w ~ o, U C ~ C 3 y (L `, « a~ ~: ~ > ~ d N~', SI C 7 O U U Q ~~ 7 O Y U O L V ~~ y N C ~.:;z~- J A 3 O n ' m ~~- Y' O ~f A O N t C f0 N 'O C O N ~ O ~ _a L U °' C z O cn ~ m .i ? 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