I am conducting the 10th mass order for Benetech GM1356 Sound Pressure Level (SPL) meter with PC data-logging software. This sound meter reads dBA and dBC weightings. A SPL meter is a must-have tool for audiophiles, home theater enthusiasts, DJs and sound engineers who want to improve their listening environment and sound systems.
Price is SGD$ 95 per unit with shipping included. Closing date is this coming Sunday, 30th November 2014 at 10pm . All payments must be received by then.
I accept payment prior to ordering via POSB/DBS/UOB ATM transfer, Internet Banking transfer or DBS PayLah! . Interested buyer please SMS/WhatsApp to me at 98805223. (Please do not call or SMS after 11pm and before 7am)
It takes approximately 4 to 6 weeks from order to collection of goods.
[photos: KopiOkaya]
PC data-logging software
SPECIFICATIONS: -
Frequency Weighting: A and C
Time Weighting selection: Fast / Slow
Accuracy: ±1.5 dB (under reference conditions)
Measuring Level: 30-130 dB (A) / 35-130 dB (C)
Linearity Range: 50 dB/100 dB
Digital Display: 4 digits
Resolution: 0.1 dB
Bar Graph: 50 dB scale at 1 dB step for monitoring current sound pressure level display
Microphone: Built-in omnidirectional 1/2" electret condenser microphone
Overload Indication: OVER/UNDER
Level Ranges: 30-80 dB, 50-100 dB, 60-110 dB, 80-130 dB, 30-130 dB RMS
Self Calibration Time: 3 seconds
Sampling Rate: 2 times/seconds
AC Signal Output: 0.707 vRMS / full bar graph, output impedance is about 600 ohms
DC Signal Output: 10 mV/dB, output impedance is about 100 ohm
USB Output: USB 2.0 via mini-jack
AUTO Backlight
Software Compatibility: Microsoft Windows XP, Windows Vista, Windows 7 and Windows 8
Power Supply: 4 x AA 1.5 V alkaline cells* or DC 6 V @ 100 mA via 2.5 mm jack
Size (W x H x D): 70 mm x 256 mm x 35 mm
Weight: 308 grams (with battery)
Case material: High impact ABS-PC
* To ensure accuracy, Benetech advises NOT to use rechargeable Ni-MH batteries.
Package includes:
1 x Sound Pressure Level Meter
1 x Sponge Ball
1 x DC 6 V Cable
1 x User Manual
1 x USB 2.0 Cable
1 x Software Mini CD
Products are R&D in Hong Kong but made in Shenzhen, China.
Product designs comply to IEC651 TYPE 2 and ANSI S1.4 TYPE 2 standards but are NOT certified for industrial use.
----------
WHY SHOULD YOU CALIBRATE YOUR AUDIO SYSTEM WITH A SPL METER?
For the past several years, studios have made multi-channel (5.1, 6.1, 7.1) music (SACD, DVD-A, DualDisc) and movies (Dolby, DTS, etc) available to home theater enthusiasts.
Unfortunately, in your home theater room, you may sit at different distances from the left, center, right, surround speakers, and the subwoofer. Since the speakers are at different distances from you, they will have different volume levels. In addition, each speaker may have its own sensitivity, and its placement in the room can affect that. In order to fully appreciate the music or movie audio in the most satisfactory and optimum way, we need to calibrate our audio system. One of the first calibrations that should be done in a home theater involves balancing the volume output of every channel (speaker) in the system to make sure the sound is being reproduced in an accurate manner. After that, we need to compensate for the speaker and room interactions.
Proper calibration ensures that you hear everything the way it was recorded by the sound engineer. Without proper calibration, you may not hear details in the main or surround channels or they may be exaggerated if the speaker levels are too high. You also may be hearing more volume from the right speaker than the left or you may have a hard time hearing the dialog because the center channel is set too low or the subwoofer is clouding the dialog.
Check out this article - RealTraps - SPL Meters
----------
ONE OF THE MANY WAYS TO CALIBRATE YOUR HOME THEATER SYSTEM
The most basic calibration I would suggest would be:
1. Set your meter to a C-weighted curve (closest to the human ear).
2. Select slow response.
3. Prepare individual channel based white-noise test tones, or use the built in ones on your amp.
4. Place the sound meter - ideally on a tripod, either in the center of the room or where you normally sit. This is effectively the 'sweet spot'.
5. Set the volume level so the left speaker is at 75dB* on the meter (this will be pretty loud in the room). Then, one at a time set the center and right speakers to the same level. You are aiming for 75db on all channels.
* Note that THX uses 80db as reference, I would stick with 75db.
6. Set the surrounds to 82dB (-3dB).
7. Set the sub between 91 - 95dB (+6 or +10dB over your L/C/R channels) - depending how dominant you want it to be.
8. Also adjust the speaker delay settings to compensate for different speaker distances. I would also use a tape measure for each speaker distance and input manually.
9. Also go through and do spot level tests at 100Hz, 1Khz and 10Khz to check overall response uniformity. Ideally you would do a 20Hz - 20,000Hz sine wave sweep and plot the response, then EQ out major dips and peaks in the room as best you can.
10. DONE!
----------
OTHER APPLICATIONS OF A SPL METER
----------
TESTIMONIES:
“I followed your instructions and did some adjustments to my two channel setup. I am happy to inform you this sound meter does help improve the sound quality." - Mr Tan
-----
"I bought the sound meter for my music room. After following your advice checking the room, I removed a few furniture away from the corner and now the boomy problem is gone. Thanks to this sound meter I'm able to do troubleshooting myself." - Douglas
-----
"My ears aren't as sensitive as before due to aging. But I was right, the right side speaker is slightly softer than the left. My sound meter helps confirm this." - Mr Khoo
-----
"I'm not a hifi person. I bought this sound meter to help to improve the acoustics of my karaoke room. Now my wife says her vocal sounds much better than before." - Michael
-----
"Thanks to your suggestions I am able to improve my home theatre with the help of this sound meter. The sound is more balance. Also, the bass from the subwoofer is more coherent." - Ian
-----
"I use this sound meter to calibrate my XBox to achieve a more realistic gaming experience." - Mr Y H Ee
-----
"Thanks for the MO. The sound meter is very useful. Before I was using sound meter app on my phone but the readings were inaccurate." - Stanley Low
-----
"Whenever my son is playing PC games, I will show him how loud his speakers are and urges him to lower them." - Farzil
-----
"My HT setup sounds much better after calibration. Thanks for the MO." - Mr Ho
----------
Price is SGD$ 95 per unit with shipping included. Closing date is this coming Sunday, 30th November 2014 at 10pm . All payments must be received by then.
I accept payment prior to ordering via POSB/DBS/UOB ATM transfer, Internet Banking transfer or DBS PayLah! . Interested buyer please SMS/WhatsApp to me at 98805223. (Please do not call or SMS after 11pm and before 7am)
It takes approximately 4 to 6 weeks from order to collection of goods.
[photos: KopiOkaya]
PC data-logging software
SPECIFICATIONS: -
Frequency Weighting: A and C
Time Weighting selection: Fast / Slow
Accuracy: ±1.5 dB (under reference conditions)
Measuring Level: 30-130 dB (A) / 35-130 dB (C)
Linearity Range: 50 dB/100 dB
Digital Display: 4 digits
Resolution: 0.1 dB
Bar Graph: 50 dB scale at 1 dB step for monitoring current sound pressure level display
Microphone: Built-in omnidirectional 1/2" electret condenser microphone
Overload Indication: OVER/UNDER
Level Ranges: 30-80 dB, 50-100 dB, 60-110 dB, 80-130 dB, 30-130 dB RMS
Self Calibration Time: 3 seconds
Sampling Rate: 2 times/seconds
AC Signal Output: 0.707 vRMS / full bar graph, output impedance is about 600 ohms
DC Signal Output: 10 mV/dB, output impedance is about 100 ohm
USB Output: USB 2.0 via mini-jack
AUTO Backlight
Software Compatibility: Microsoft Windows XP, Windows Vista, Windows 7 and Windows 8
Power Supply: 4 x AA 1.5 V alkaline cells* or DC 6 V @ 100 mA via 2.5 mm jack
Size (W x H x D): 70 mm x 256 mm x 35 mm
Weight: 308 grams (with battery)
Case material: High impact ABS-PC
* To ensure accuracy, Benetech advises NOT to use rechargeable Ni-MH batteries.
Package includes:
1 x Sound Pressure Level Meter
1 x Sponge Ball
1 x DC 6 V Cable
1 x User Manual
1 x USB 2.0 Cable
1 x Software Mini CD
Products are R&D in Hong Kong but made in Shenzhen, China.
Product designs comply to IEC651 TYPE 2 and ANSI S1.4 TYPE 2 standards but are NOT certified for industrial use.
----------
WHY SHOULD YOU CALIBRATE YOUR AUDIO SYSTEM WITH A SPL METER?
For the past several years, studios have made multi-channel (5.1, 6.1, 7.1) music (SACD, DVD-A, DualDisc) and movies (Dolby, DTS, etc) available to home theater enthusiasts.
Unfortunately, in your home theater room, you may sit at different distances from the left, center, right, surround speakers, and the subwoofer. Since the speakers are at different distances from you, they will have different volume levels. In addition, each speaker may have its own sensitivity, and its placement in the room can affect that. In order to fully appreciate the music or movie audio in the most satisfactory and optimum way, we need to calibrate our audio system. One of the first calibrations that should be done in a home theater involves balancing the volume output of every channel (speaker) in the system to make sure the sound is being reproduced in an accurate manner. After that, we need to compensate for the speaker and room interactions.
Proper calibration ensures that you hear everything the way it was recorded by the sound engineer. Without proper calibration, you may not hear details in the main or surround channels or they may be exaggerated if the speaker levels are too high. You also may be hearing more volume from the right speaker than the left or you may have a hard time hearing the dialog because the center channel is set too low or the subwoofer is clouding the dialog.
Check out this article - RealTraps - SPL Meters
----------
ONE OF THE MANY WAYS TO CALIBRATE YOUR HOME THEATER SYSTEM
The most basic calibration I would suggest would be:
1. Set your meter to a C-weighted curve (closest to the human ear).
2. Select slow response.
3. Prepare individual channel based white-noise test tones, or use the built in ones on your amp.
4. Place the sound meter - ideally on a tripod, either in the center of the room or where you normally sit. This is effectively the 'sweet spot'.
5. Set the volume level so the left speaker is at 75dB* on the meter (this will be pretty loud in the room). Then, one at a time set the center and right speakers to the same level. You are aiming for 75db on all channels.
* Note that THX uses 80db as reference, I would stick with 75db.
6. Set the surrounds to 82dB (-3dB).
7. Set the sub between 91 - 95dB (+6 or +10dB over your L/C/R channels) - depending how dominant you want it to be.
8. Also adjust the speaker delay settings to compensate for different speaker distances. I would also use a tape measure for each speaker distance and input manually.
9. Also go through and do spot level tests at 100Hz, 1Khz and 10Khz to check overall response uniformity. Ideally you would do a 20Hz - 20,000Hz sine wave sweep and plot the response, then EQ out major dips and peaks in the room as best you can.
10. DONE!
----------
OTHER APPLICATIONS OF A SPL METER
- Building a Recording Studio or Sound-Proof Room
If you are building a recording studio, having an SPL meter is important as you can measure how much sound enters the studio from outside. You can also calculate how much sound proofing you will need to keep your own noise private.
- Checking the Frequency Response of Speakers
This test is a good way to determine the frequency response of your speakers. With the help of a test disc, play different test tones at different frequencies and measure the response of your speakers with an SPL meter. Chances are that most loudspeakers do not have a flat frequency response from 20Hz to 20,000Hz and their output will drop dramatically at high and low frequencies.
- Safety: You Only Have Two Ears
Measuring sound pressure levels in your listening room can help prevent damage to your hearing from long term exposure to high sound levels. Continuous high pressure levels (> 100 dB) can permanently damage your ears and your loudspeakers.
----------
TESTIMONIES:
“I followed your instructions and did some adjustments to my two channel setup. I am happy to inform you this sound meter does help improve the sound quality." - Mr Tan
-----
"I bought the sound meter for my music room. After following your advice checking the room, I removed a few furniture away from the corner and now the boomy problem is gone. Thanks to this sound meter I'm able to do troubleshooting myself." - Douglas
-----
"My ears aren't as sensitive as before due to aging. But I was right, the right side speaker is slightly softer than the left. My sound meter helps confirm this." - Mr Khoo
-----
"I'm not a hifi person. I bought this sound meter to help to improve the acoustics of my karaoke room. Now my wife says her vocal sounds much better than before." - Michael
-----
"Thanks to your suggestions I am able to improve my home theatre with the help of this sound meter. The sound is more balance. Also, the bass from the subwoofer is more coherent." - Ian
-----
"I use this sound meter to calibrate my XBox to achieve a more realistic gaming experience." - Mr Y H Ee
-----
"Thanks for the MO. The sound meter is very useful. Before I was using sound meter app on my phone but the readings were inaccurate." - Stanley Low
-----
"Whenever my son is playing PC games, I will show him how loud his speakers are and urges him to lower them." - Farzil
-----
"My HT setup sounds much better after calibration. Thanks for the MO." - Mr Ho
----------
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