The attached report includes:

Transcription

1 Customer Name: Wood Shop, Inc. Location: 123 Main St. Chaska, MN Dates: Data Gathered: 8/14/12 Report Provided: 9/4/12 Service: Validation Report Cover Letter (this page) The following information is the full report for the Wood Shop, Inc. in Chaska, Minnesota. The customer reported that the room was simply too loud for the workers using the space. Diagnoise was provided with the necessary information about the room along with pictures of the space, a brief description of the room use along with a short video of space during normal operation. The attached report includes: Cover Letter (This Page)... 1 Report Summary... 2 Predicted And Measured Dba Reduction Graph... 3 Untreated, Predicted, And Measured After Treatment Installed Sound Pressure Levels... 4 Predicted Reverberation Times... 5 Sound Pressure Levels Per Frequency... 6 Color Image For Untreated Space... 7 Color Image For Predicted Treated Space... 8 Room Treatment Layout Model... 9 Quote For Products To Install Spec Page For Products To Install Perceived Volume Reduction Chart We would like to sincerely thank you for choosing the diagnoise remote sound testing service. If you have any questions or concerns about any of the data presented, please feel free to contact me, I would be happy to discuss the report with you or explain the data further. This report has been generated to illustrate the difference in the predicted sound pressure difference and the actual, post installation sound pressure difference. This report validates the prediction. Thank you, Ted Weidman Diagnoise 123 Columbia Court N, Chaska, MN f ted@remotesoundtesting.com Diagnoise All Rights Reserved Page 1

2 REPORT SUMMARY Measured existing dba level: 86.0 dba Predicted post treatment: 84.5 dba Measured Post Treatment: 83.0 dba Result: 3 dba Reduction This is an actual SPL (sound pressure level) reduction of 50%. This is an 18.7% perceived volume reduction to the human ear. Reverberation Time: Predicted untreated space: 2.7 second reverberation time Predicted Treated Space: 1.55 second reverberation time Baseline results indicated that measurement point number 1 showed the most intense sound pressure levels. Baseline result at point #1 presented at 87.2 dba with an average dba (considering four data location points) of 86.0 dba. Product installed: 48 baffles (384 sq/ft) 2 #3lb Echo Eliminator Baffles Baffles installed in six primary rows and multiple sub-rows along the bottom of the joists. Please review the image on page 9 of this report for an illustration of the location and orientation of the baffles. Diagnoise All Rights Reserved Page 2

3 PREDICTED AND MEASURED dba REDUCTION GRAPH Figure 3B Predicted and Measured SPL Reductions at Four Measurement Points After Treatment Diagnoise All Rights Reserved Page 3

4 UNTREATED, PREDICTED, AND MEASURED AFTER TREATMENT INSTALLED SOUND PRESSURE LEVELS Figure 2B A-weighted SPL Measurements at Four Points for Before Treatment, Predicted SPL After Treatment, and Measured SPL After Treatment Diagnoise All Rights Reserved Page 4

5 Reverb Time (s) PREDICTED REVERBERATION TIMES Table 4 Predicted Room Reverberation Times (in seconds) and Reductions Octave Baseline Treated Reduction Predicted Room Reverberation Times Baseline Treated Octave Band (Hz) Figure 6 Predicted Room Reverberation Times Diagnoise All Rights Reserved Page 5

6 Point # Point # Point # SOUND PRESSURE LEVELS PER FREQUENCY Table 1 Measured Baseline SPL Values (dba) of all measurement points of interest (before installing baffles) Octave Table 2 Prediction of Solution #1 SPL Values (dba) of all measurement points of interest (after installing ceiling baffles) Octave Table 3 Measured Treated SPL Values (dba) of all measurement points of interest (after installing ceiling baffles) Diagnoise All Rights Reserved Page 6

7 COLOR IMAGE FOR UNTREATED SPACE Figure 4 Flat-Weighted SPL for Untreated Room (baseline) Diagnoise All Rights Reserved Page 7

8 COLOR IMAGE FOR PREDICTED TREATED SPACE Figure 5 Flat-Weighted SPL for Hanging Ceiling Baffles Diagnoise All Rights Reserved Page 8

9 ROOM TREATMENT LAYOUT MODEL Figure 1 Model of Room with Virtual Sources (letters), Measurement Points (numbers), and treatment areas hanging from ceiling Diagnoise All Rights Reserved Page 9

10 QUOTE FOR PRODUCTS TO INSTALL Diagnoise All Rights Reserved Page 10

11 SPEC PAGE FOR PRODUCTS TO INSTALL Diagnoise All Rights Reserved Page 11

12 PERCEIVED VOLUME REDUCTION CHART db ACTUAL SPL REDUCTION PERCEIVED VOLUME REDUCTION 2 db 41.50% 10.66% 3 db 50.00% 18.77% 4 db 58.80% 23.10% 5 db 68.90% 28.44% 6 db 75.00% 34.02% 7 db 79.10% 38.81% 8 db 82.50% 42.73% 9 db 87.50% 46.41% 10 db 89.00% 49.66% 11 db 91.10% 53.00% 12 db 93.75% 56.47% THRESHOLD OF FEELINGS DEAFENING VERY LOUD LOUD MODERATE FAINT VERY FAINT A-Weighted Sound Levels THRESHOLD OF AUDIBILITY DECIBELS RE 20 INTENSITY UPA ENERGY UNITS RELATIVE LOUDNESS Jet Takeoff (200 ) Artillery 120 1,000,000,000, Elevated Train Subway (20 ) ,000,000, Printing Press ,000,000, Police Whistle 90 1,000,000, Vacuum Cleaner (10 ) ,000, Street Noise 70 10,000, Noisy Office Large Store 60 1,000, Conversation , Average Office Private Office 40 10, Quiet Conversation Studio (Speech) 30 1,000 8 Rustle of Leaves Whisper Diagnoise All Rights Reserved Page 12