How to use corrected response for further measurements? - Home Theater Forum and Systems - HomeTheaterShack.com

Old 06-05-14, 06:16 PM Thread Starter
Shackster

Join Date: May 2014
Posts: 6
How to use corrected response for further measurements?

Hi!

After having tammed the extreme bass response my room induce, I understand that flat bass isn't what I prefer, so I heard and read about house curves and tried to create one and create new filters with it. However, I read somewhere (I do not recall where, but it's in here, on HTS) that we need to listen to different frequencies, lets say 30 and 100 until they sound as if they were the same volume and note their according SP, but that to do so, I would need to generate sine waves using a corrected (or filtered) response... in particular if these frequencies are affected by filters.

Also, is there a way to generate a new measurement on REW while using previous filters to see how our filtered response affect frequency range, phase and everything?

Thanks!
pyrocyborg is offline

Old 06-06-14, 12:43 PM
HTS Senior Moderator

Join Date: Apr 2006
Location: Katy, Texas
Posts: 8,811
Re: How to use corrected response for further measurements?

Quote:
pyrocyborg wrote: View Post
However, I read somewhere (I do not recall where, but it's in here, on HTS) that we need to listen to different frequencies, lets say 30 and 100 until they sound as if they were the same volume and note their according SP
Good chance you saw that in my house curve article, which you can access in my signature.

Quote:
, but that to do so, I would need to generate sine waves using a corrected (or filtered) response... in particular if these frequencies are affected by filters.

Also, is there a way to generate a new measurement on REW while using previous filters to see how our filtered response affect frequency range, phase and everything?
All quite unnecessary, on two fronts. Perhaps a simplistic description, but the equalizer merely adjusts the level of designated frequencies up or down. For instance, if you set a filter for 80 Hz and cut it 6 dB, an 80 Hz test tone played afterwards will be 6 dB lower. A sine wave is merely a tone generated at a specific frequency. “Filtering” at that frequency it is merely the same thing as manually adjusting its level up or down. Make sense?

The other “unnecessary” is that you don’t need to have equalization in place before determining a house curve. As the house curve article explains, you merely determine the SP levels where 30 Hz and 100 Hz sound like they’re at the same volume. You’re going to be turning your sub (or main volume control) up and down anyway to accomplish this exercise, so any EQ (i.e. volume adjustments at certain frequencies, remember?) the sub may or not have does not matter.

For instance, let’s say you ultimately determine that you have to have 30 Hz at 78 dB and 100 Hz at 73 dB for them to sound the same. If you perform the exercise with the EQ on, and then again with the EQ off you will get the same result: 30 Hz and 100 Hz sound the same at 78 dB and 73 dB. The differential is a function of the room itself, not any electronic manipulation that might be in place.

After determining the SPL differential between 30 and 100 Hz you create a house curve file, load it into REW, and EQ along the Target line.

Regards,
Wayne

Wayne A. Pflughaupt is offline
Old 06-06-14, 01:08 PM Thread Starter
Shackster

Join Date: May 2014
Posts: 6
Re: How to use corrected response for further measurements?

Makes sense now. Thank you!
pyrocyborg is offline

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