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Another adventure into room acoustics
#229203 11/10/08 03:09 AM
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I didn't want to stomp on other people's threads, so I am starting my own. I don't have a SPL Meter, but my Pioneer Elite VSX-54TX has a RS232 port on the back that allows me to connect a computer, run their "professional" EQ MCACC stuff and output the data to my computer.

Anyway, I ran it tonight, and came up with some pretty graphs.

The room is very (VERY) unusually shaped (I'll post a diagram later) with no treatments outside of carpet and the couch.

First up, each channel's frequency response in my room.

FRONT LEFT


FRONT CENTER


FRONT RIGHT


SURROUND LEFT


SURROUND RIGHT



Farewell - June 4, 2020
Re: Another adventure into room acoustics
nickbuol #229206 11/10/08 03:14 AM
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Next up is the frequency response graphs showing all of the channels at a particular frequency.

FREQ 63Hz


FREQ 125Hz


FREQ 250Hz


FREQ 1kHz


FREQ 4kHz


FREQ 11.3kHz



Farewell - June 4, 2020
Re: Another adventure into room acoustics
nickbuol #229207 11/10/08 03:15 AM
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Thanks for posting Nick. The graphs have different axes than I'm used to looking at, so please bear with my questions.

It's loudness against time, and the different colored lines represent the frequencies played? (i.e. 63 Hz though 11.3 kHz?)

Also, does the RS232 connect to a microphone to measure the output from the speakers, or is it just measuring the output of the different channels on the receiver before they are driven through the speakers?

Jason


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Re: Another adventure into room acoustics
nickbuol #229214 11/10/08 03:21 AM
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No subwoofer test. I don't know if the Pioneer Elite can check the sub level using this tool. I'll have to play around more with that to see what I can get, if anything, of the subwoofer levels.

As for the room layout, here it is (I told you it was irregularly shaped)...

The blue "thing" is what I hope will be the custom furnature that I have been waiting YEARS to get done. The design has changed a little on that, but only in that the sub may get placed in the other corner between the left QS8 and the projector. Neither is ideal I am sure, but the space is limited, and I am thinking about putting a 2nd sub (not a huge cylinder style) in the room to help.




Farewell - June 4, 2020
Re: Another adventure into room acoustics
nickbuol #229217 11/10/08 03:24 AM
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Wow, that is some room! You weren't kidding. \:D


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Re: Another adventure into room acoustics
myrison #229218 11/10/08 03:25 AM
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 Originally Posted By: myrison
Thanks for posting Nick. The graphs have different axes than I'm used to looking at, so please bear with my questions.

It's loudness against time, and the different colored lines represent the frequencies played? (i.e. 63 Hz though 11.3 kHz?)

Also, does the RS232 connect to a microphone to measure the output from the speakers, or is it just measuring the output of the different channels on the receiver before they are driven through the speakers?

Jason


Yea, I'm learning too since it seems to be a little different.

As for the RS232 and microphone question, it uses a microphone that came with the receiver that I placed at ear level in the primary seating position. The receiver them played a variety of white noise and pulses (for echo???) for all of the channels for a little while. Again, I'm looking to see if this is useful at all, or if I just need to spend the countless hours graphing with a SPL meter. It was nice to set this up, press START, walk away for 15 minutes, and then come back and see it on my computer already graphed...


Farewell - June 4, 2020
Re: Another adventure into room acoustics
nickbuol #229222 11/10/08 03:32 AM
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Thanks Nick. I see now the second set of graphs showing the dB response of a specific frequency as well.

That is unquestionably a very cool function of the receiver, and the "set it and forget it" factor doesn't hurt either.

The only reason I think you might want to get an SPL meter is to test the sub's response (if you find out the Pio can't do it), especially if you're thinking about getting a second subwoofer. It seems like it should do it though given all the rest of the information it spits out!

Jason


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Re: Another adventure into room acoustics
myrison #229225 11/10/08 03:36 AM
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I went into the Advanced MCACC program on my computer again, and it doesn't seem like I can change the axis from dB and Time to show dB and Freq. I will look again for anything to check the sub. I also just remembered that the receiver will do some on-screen graphing that I think is different than what it outputs to the computer. Right now, my wife is telling me to stop for the night so that we can watch a TV show that she has been wanting to see, so I may not get another chance until tomorrow night.


Farewell - June 4, 2020
Re: Another adventure into room acoustics
nickbuol #229254 11/10/08 07:24 AM
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Thats cool Nick. Is EQ MCACC their version of Audysey EQ? If so, it must have some way of measuring frequency against spl to do auto equalization. I hope you find a way to display it on you computer.

If you don't, consider buying an spl meter and using rew. Its a small investment to show you whats happening in your room. Well, until you see how bad the in room response is and want to start putting in all sorts of treatments.


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: Another adventure into room acoustics
fredk #229256 11/10/08 07:27 AM
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 Originally Posted By: fredk
Is EQ MCACC their version of Audysey EQ?


Man, E.Q. McAcc is another good character name.

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