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Target responses for small listening rooms

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sthpaul

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June 28, 2017

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June 28, 2017 - 7:17 pm

Hi Dennis and All

Just wondering what target responses we should be aiming for in small listening rooms with respect to acoustic standards. Obviously the aim is to have a great sounding room.
I have been reading the paper written by Nyal Mellor and Jeff Hedback called ‘Acoustical Measurement Standards for Stereo Listening Rooms’ which has a good reference set. I have also been reading up on Clarity 50 and 80 (which we can now assess from REW results) but I can’t find what values we should be aiming for here. Can anyone point me in the direction of what would be considered target values for a good result?

Thanks

Dennis Foley

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June 30, 2017 - 8:42 am

Hi Paul, What specific “target values” are you referring to?

sthpaul

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July 2, 2017 - 8:02 pm

Dennis, I’m not entirely sure but hopefully my further info will help.
Looking at my rooms REW results for C80. The left axis is dB and the right is %. My results average at 24.6dB (69.2%) but vary over the frequency range. It curves down to 21dB between 1200Hz to 11kHz and then goes up and down between 1200Hz to 55Hz with peaks up to 30dB and dips to 15dB. Sorry I couldn’t work out how to attach or insert a pic.
I’m using C80 (as opposed to C50) as I understand this is more pertinent to smaller listening rooms.
Is the aim to have the results smooth across the frequency spectrum? and what dB or % value (or range of values) should we be aiming for?
Any assistance would be appreciated.

PS I did just watch your videos on reverberation and presence which were great and touch on the topic of clarity, just looking for some further guidance.
Thanks

Dennis Foley

Chief Acoustics Engineer

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July 3, 2017 - 9:00 am

Hi Paul, This is a typical response curve in small rooms. Any peak or trough that is 20 dB or greater requires extensive treatment. We have the most powerful low frequency technology created and we can attenuate only 2 dB of energy per unit installed below 100 Hz. With 20 dB of excess energy, you will need 10 units minimum. This must be a very small room. Try and choose a room from the green area in this graphic. https://acousticfields.com/wp-…..-Large.jpg