Questions/Observations about 3 different methods of sub PEQ (MiniDSP 2x4 and REW) - Page 3 - AVS Forum | Home Theater Discussions And Reviews
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post #61 of 71 Old 04-29-2017, 05:30 PM
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Down firing can be interesting for those of us who are not on concrete floors....

Link to budget Home Theater build

http://www.avsforum.com/forum/19-ded...i-version.html
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post #62 of 71 Old 04-29-2017, 05:59 PM
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Questions/Observations about 3 different methods of sub PEQ (MiniDSP 2x4 and REW)

No clue how I just found this thread now but I had an idea Plasma. Why not set the target to be at the bottom of the dip and PEQ the remaining response down to that? Then just boost Subwoofer channel on your AVR?

EDIT: Nevermind I see now that you fixed by moving. This would have been a suggestion for the original issue of boosting the dip.
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post #63 of 71 Old 04-30-2017, 05:28 AM - Thread Starter
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Quote:
Originally Posted by citsur86 View Post
No clue how I just found this thread now but I had an idea Plasma. Why not set the target to be at the bottom of the dip and PEQ the remaining response down to that? Then just boost Subwoofer channel on your AVR?

EDIT: Nevermind I see now that you fixed by moving. This would have been a suggestion for the original issue of boosting the dip.
Without boost filters, the dip would still remain with that approach, albeit slightly better. However, the subjective SQ is best when target level is where REW sets it (halfway between peaks and dips).

Anyhow, this time REW did basically set the target level at the bottom of the now smaller dip.
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post #64 of 71 Old 06-06-2017, 09:46 AM - Thread Starter
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here are the updated measures after getting a boom mic stand and measuring in sweet spot 1 foot above highest part of mattress with thick blanket on mattress... stand is not touching anything but floor (except for UMIK-1 usb cable touching mattress)

sub PEQ cut only and YPAO auto EQ off, sub is set to mid bass extension/damping, 100Hz global x-over in AVR... basically everything as I normally listen and no sw dist tweak done (just sub PEQ and YPAO run):









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post #65 of 71 Old 06-06-2017, 10:16 AM
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Quote:
Originally Posted by PlasmaPZ80U View Post
here are the updated measures after getting a boom mic stand and measuring in sweet spot 1 foot above highest part of mattress with thick blanket on mattress... stand is not touching anything but floor (except for UMIK-1 usb cable touching mattress)

sub PEQ cut only and YPAO auto EQ off, sub is set to mid bass extension/damping, 100Hz global x-over in AVR... basically everything as I normally listen and no sw dist tweak done (just sub PEQ and YPAO run)...

Looks good! What is your noise floor? Asking because I thought I remember the suggestion being to measure at 40db higher than the noise floor and noise floor in most cases being around 50db. Not sure if it really effects the measurements much, but maybe run a couple sweeps around 90db and see how it looks.
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post #66 of 71 Old 06-06-2017, 11:21 AM - Thread Starter
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Quote:
Originally Posted by citsur86 View Post
Looks good! What is your noise floor? Asking because I thought I remember the suggestion being to measure at 40db higher than the noise floor and noise floor in most cases being around 50db. Not sure if it really effects the measurements much, but maybe run a couple sweeps around 90db and see how it looks.
noise floor is pretty low, below what the UMIK-1's limitations are (I believe it is limited to 50dB noise floor based on Jerry's guide, page 50):

"Your listening room’s noise floor
Using the REW SPL Meter, click the red record button. Make the room as quiet as possible—turn off the HVAC system, turn off appliances such as the refrigerator if it is within hearing distance, quiet the wife, kids, pets, etc. When things are as quiet as possible, the REW SPL Meter is displaying the noise floor in your room. Most typical listening rooms with have a noise floor of approximately 40dB. However, with the USB mic’s we are seeing readings of 50dB, which is the lower limit of the USB microphone’s measurement range."

In any case I have measured 10dB higher before, and aside for distortion figures being lower and perhaps some very low dB noise in waterfall, there is no noticeable difference between 75dB peak level and 85dB peak level (based on spectrogram scale method). I did measure LFE at 85dB (just used a -10dB offset afterwards) and FL+FR+sub was 6dB higher than the individual parts, but again used -6dB offset afterwards to compensate).

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post #67 of 71 Old 06-06-2017, 11:24 AM - Thread Starter
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^If there is noise, with frequency response you get odd, very narrow upward and downwards spikes in the lower dB areas with unsmoothed modal response.

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post #68 of 71 Old 06-06-2017, 11:46 AM
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Quote:
Originally Posted by PlasmaPZ80U View Post
^If there is noise, with frequency response you get odd, very narrow upward and downwards spikes in the lower dB areas with unsmoothed modal response.
Got it - so maybe I don't have to run the sweeps so loud at 12am when the family is sleeping. Since it's basically the only time I can get some quiet in my house, I bought a couple sound machines for mine and my son's rooms upstairs. Blocks the sweep sound entirely.
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post #69 of 71 Old 06-06-2017, 11:48 AM - Thread Starter
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Quote:
Originally Posted by citsur86 View Post
Got it - so maybe I don't have to run the sweeps so loud at 12am when the family is sleeping. Since it's basically the only time I can get some quiet in my house, I bought a couple sound machines for mine and my son's rooms upstairs. Blocks the sweep sound entirely.
as long as 75-80dB level looks the same as 90dB you should be good

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post #70 of 71 Old 06-06-2017, 11:57 AM - Thread Starter
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here is an example of mild noise past 200Hz on the LFE measure (first is low extension/damping with noise, second is mid without noise):
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post #71 of 71 Old 06-08-2017, 09:12 AM - Thread Starter
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.mdat file for those who want to see it.

https://drive.google.com/file/d/0B2P...ew?usp=sharing

-7.1ch Bedroom HT-
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Yamaha RX-A2070
SVS Prime Bookshelf and Prime Center
Sony SS-CS5 Surrounds and Cambridge S20 Rear Surrounds
Rythmik LV12R

Last edited by PlasmaPZ80U; 06-08-2017 at 09:30 AM.
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