Author Topic: room acoustic  (Read 13883 times)

jb

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room acoustic
« on: August 03, 2016, 11:48:03 AM »
Ok, you have already spend multiple $$ on your HiFi system, but some how it does not sound anything  like in the demo show room experience. Well the problem may be due to your hifi room acoustic that is create too much echo or just simple speaker placement position can have a great effect on sound.

You can download a free copy of REW Room EQ - a room acoustic measurement software from here http://www.roomeqwizard.com/
then go head and purchase a UMIK-1 USB Measurement calibrated microphone from here  https://www.minidsp.com/products/acoustic-measurement/umik-1   ,and with a laptop PC then you are all set for your hifi room acoustic measurement.

The REW software allow you to measure the room frequency response, impulse response, RT60, waterfall and spectrogram, this will allow you to know whether you need to add more acoustic absorption or diffusion material in your hifi room to get a balance sound.


A local singapore company that sell room acoustic treatment bass trap and diffuser and are highly recommend here  http://auralaid.com/
« Last Edit: August 03, 2016, 02:33:37 PM by jb »

jb

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Re: room acoustic
« Reply #1 on: August 03, 2016, 11:51:26 AM »
Typical REW measurement plot-water fall diagram, as can be seen, from 200Hz and above most of the sound amplitude die down within 300ms, but at 30Hz region after 600ms the amplitude is still high and can be heard. To solve this kind of acoustic issue will required big Helmholtz Resonators. Helmholtz Resonators calculator can be found here: http://www.vk2zay.net/calculators/helmholtz.php


« Last Edit: July 14, 2017, 11:00:49 AM by jb »

jb

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Re: room acoustic
« Reply #2 on: August 03, 2016, 11:52:57 AM »
Room frequency response plot

« Last Edit: July 14, 2017, 10:59:56 AM by jb »

jb

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Re: room acoustic
« Reply #3 on: August 03, 2016, 11:53:54 AM »
RT30 plot

« Last Edit: July 14, 2017, 10:59:09 AM by jb »

jb

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Re: room acoustic
« Reply #4 on: August 03, 2016, 11:54:42 AM »
Room Acoustic spectrum

« Last Edit: July 14, 2017, 10:53:35 AM by jb »

jb

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Re: room acoustic
« Reply #5 on: August 03, 2016, 12:49:02 PM »
Room mode calculator-  If you have the resource and place, then choosing a golden ratio of room dimension will help to resolve a lot of acoustic issue. Of course , all this have to be plan well ahead with a room dimension that can provide a comfortable listening environment and best have a acoustic engineer to advice and help building the room.

I find the attached site provided allow you to enter your room dimension, then it will calculate where frequency beating occurs, the goal is to reduce the low frequency band 20 to 100Hz region frequency beating, as 300Hz to 20 Khz can easily use acoustic absorber/diffuser to solve it.
More info can read from their web site.

 http://amroc.andymel.eu/?l=23&w=17&h=10&ft=true&r60=0.6

« Last Edit: July 19, 2017, 12:28:46 PM by jb »

jb

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Re: room acoustic
« Reply #6 on: August 03, 2016, 08:56:31 PM »
HiFi room design and speaker placement by Cardas Audio for best sound here:  http://www.cardas.com/room_setup_golden_cuboid.php



« Last Edit: July 14, 2017, 10:49:42 AM by jb »