Which smoothing filter to use in measurement - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 7 Old 04-24-12, 12:54 PM Thread Starter
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Which smoothing filter to use in measurement

I have been using 1/48 smoothing filter in my Preferences. Should I use another smoothing filter like 1/6 instead ? What is the impact on using 1/6 vs 1/48 besides smoothing out the measured curve ? Tks

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Speakers: Salk Song Towers , Surrounds Polk Ceiling Spkrs, Subwoofer SVS PC12-NSD
Receiver: Onkyo NR3007 ; PreAmp: Jolida Fusion ;Amp : Odyssey Khartago SE+++
Sources: DirecTV HR24 and H25 ; Oppo 980H ; Toshiba HD -A2 ; WDTV Live; Panasonic BDT110; SB Touch
Display : Panasonic 58PH10UKA, Panasonic 50ST30
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post #2 of 7 Old 04-24-12, 03:36 PM
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Re: Which smoothing filter to use in measurement

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sportflyer wrote: View Post
I have been using 1/48 smoothing filter in my Preferences. Should I use another smoothing filter like 1/6 instead ? What is the impact on using 1/6 vs 1/48 besides smoothing out the measured curve ? Tks
I am pretty sure that smoothing/averaging setting only affects the display, not the measurements.

I think the rule of thumb is to use very little or no smoothing for the low frequency graphs and heavier (1/6 or even 1/3) smoothing for full range graphs.

Ethan Winer of Real Traps recommends setting smoothing at 1/24 for LF and 1/3 for MF and HF range graphs
http://www.realtraps.com/art_measuring.htm
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post #3 of 7 Old 04-24-12, 03:40 PM Thread Starter
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Re: Which smoothing filter to use in measurement

Can the smoothing filters be applied after measurements?

HT/2 Ch Audio
Speakers: Salk Song Towers , Surrounds Polk Ceiling Spkrs, Subwoofer SVS PC12-NSD
Receiver: Onkyo NR3007 ; PreAmp: Jolida Fusion ;Amp : Odyssey Khartago SE+++
Sources: DirecTV HR24 and H25 ; Oppo 980H ; Toshiba HD -A2 ; WDTV Live; Panasonic BDT110; SB Touch
Display : Panasonic 58PH10UKA, Panasonic 50ST30
Remote: Harmony 720
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post #4 of 7 Old 04-24-12, 03:42 PM
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Re: Which smoothing filter to use in measurement

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sportflyer wrote: View Post
Can the smoothing filters be applied after measurements?
yes. you can apply or remove smoothing for any existing measurements.
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post #5 of 7 Old 04-24-12, 05:01 PM
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Re: Which smoothing filter to use in measurement

If you are using eq it pays to use the 1/3 smoothing so you don't over eq.
I generally use either 1/3 or 1/6
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post #6 of 7 Old 04-25-12, 09:53 AM
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Re: Which smoothing filter to use in measurement


Quote:
zheka wrote: View Post
I think the rule of thumb is to use very little or no smoothing for the low frequency graphs and heavier (1/6 or even 1/3) smoothing for full range graphs.

Ethan Winer of Real Traps recommends setting smoothing at 1/24 for LF and 1/3 for MF and HF range graphs
http://www.realtraps.com/art_measuring.htm
Zheka has it right: No smoothing for low-freq graphs, 1/6 or 1/3 for full range. Due to comb filtering caused by reflections, most rooms deliver a “ragged” graph for the upper frequencies. Smoothing allows you to see the underlying trend in frequency response.

Regards,
Wayne



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post #7 of 7 Old 04-26-12, 10:40 AM Thread Starter
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Re: Which smoothing filter to use in measurement

Wayne , you are right , the high freq graphs are raggedly without the smoothing filters. BTW when running the Sub curves should I leave the LPF of LFE at 120hz ? Would this setting would impact sub measurements in stereo mode ?

HT/2 Ch Audio
Speakers: Salk Song Towers , Surrounds Polk Ceiling Spkrs, Subwoofer SVS PC12-NSD
Receiver: Onkyo NR3007 ; PreAmp: Jolida Fusion ;Amp : Odyssey Khartago SE+++
Sources: DirecTV HR24 and H25 ; Oppo 980H ; Toshiba HD -A2 ; WDTV Live; Panasonic BDT110; SB Touch
Display : Panasonic 58PH10UKA, Panasonic 50ST30
Remote: Harmony 720
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