Manual Response Testing - All 5.1 Channels - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 20 Old 12-22-08, 01:59 PM
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Re: Manual Response Testing - All 5.1 Channels

In my experience, soundcard calibration usually come very linear, with a slight drop in the extremes. My current soundcard calibration is down 1dB at 5Hz, and brickwalls at 20-something kilohertz. Plenty linear enough to be skipped, in my book. I get much more variation moving the microphone an inch.


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post #12 of 20 Old 12-22-08, 02:28 PM
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Re: Manual Response Testing - All 5.1 Channels

Use analog instead of HDMI and it will work. It is just like being in the cinema. Use the voltage to calibrate voltage. It's that simple.
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post #13 of 20 Old 12-22-08, 05:49 PM
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Re: Manual Response Testing - All 5.1 Channels

Quote:
pcasper wrote: View Post
On a side note, is anyone aware of a test cd or dvd that generates sustained full-band pink noise in each channel? The Essentials and Avia disks don't do it as far as I know, except maybe for the front L+R channels. You could just use the spectrum analysis feature of REW with this disk, but you would have to negate the soundcard calibration unless you could figure out a way to calibrate only the receive side.
For L+R you can use REW to do that, open the signal generator, select "Pink PN" as the signal type, set the length the same as the REW RTA FFT length and click the "Save PN to WAV File" button. That will generate a periodic pink noise sequence of 1 minute duration that you can burn to a CD or DVD. Periodic pink noise has the advantage that it contains all frequencies in a single sequence of the selected length, which means you get stable readings with far less averaging than using pink-weighted random noise. Make sure the RTA window is set to Rectangular.

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Anyway, I want to take this opportunity to thank brucek and anyone else that has contributed to the development of REW. This tool is absolutely fantastic and I just marvel at it's capabilities every time I use it. I am a grizzled old retired engineer and I remember when we had to do everything on a slide rule, so the technology available today boggles my mind. You guys deserve a special place in the audio hall of fame.
You are very welcome
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post #14 of 20 Old 01-04-09, 09:29 AM
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Re: Manual Response Testing - All 5.1 Channels

I'll piggy back on this thread since I have the same 5.1 (7.1 really) question. GREAT tool by the way. I have a separate amp, and an Onkyo SR702 receiver (a pre/pro in my system) that has 7.1 analog inputs. I've previously leveled my speakers using optical out and Avia... and 80 on my Onkyo dial equated to 75 SPL at the the listening position.

So, I've calibrated my sound card and SPL meter per the REW Help. For calibration, I plugged the analog out of my sound card into one of the Onkyo's L+R analog inputs (not the 7.1 inputs). As an FYI, 80 on my Onkyo equated to 75 SPL at the listening position.

So now I am wondering... since everything on my HTPC is calibrated and 80 on the Onkyo dial equates to 75 SPL at the listening position whether I use Avia or REW, I should be able to test 7.1 channels? I am thinking I can plug the sound card output into, say, the Onkyo 7.1 center channel input, run sweeps, etc. Then repeat for the remaining 7.1 inputs. Once I have the sweeps, I can tweak the Onkyo Equalizer manually to make corrections.

Am I missing something?

-T
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post #15 of 20 Old 01-04-09, 09:37 AM
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Re: Manual Response Testing - All 5.1 Channels

Quote:
Once I have the sweeps, I can tweak the Onkyo Equalizer manually to make corrections.

Am I missing something?
It would be fine if each speaker never played the same frequency as another speaker. You aren't considering the effect of interaction/cancellation between speakers....

brucek
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post #16 of 20 Old 01-04-09, 10:39 AM
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Re: Manual Response Testing - All 5.1 Channels

Quote:
brucek wrote: View Post
It would be fine if each speaker never played the same frequency as another speaker. You aren't considering the effect of interaction/cancellation between speakers....

brucek
Yeah, each speaker will be tested/equalized in isolation, meaning no interaction with the other speakers. Thanks brucek.

-T
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post #17 of 20 Old 06-03-09, 09:43 AM
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Re: Manual Response Testing - All 5.1 Channels

How about a feature that lets you select output channel also, not only input channel? That way you could at least do measurements of all speakers without having to fiddle around hooking up each channel separately, if you have the analog 7.1 outputs hooked up to the 7.1 inputs on the receiver. Also you could check EQ if you do the EQ on the computer with DRC/Convolver or similar. (I think it's possible to route the output of REW through Convolver using Virtual Audio Cable or something similar.)

Regards,
Audun
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post #18 of 20 Old 06-08-09, 11:16 PM
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Re: Manual Response Testing - All 5.1 Channels

I've been trying to figure out a way to do the same thing. This isn't exactly what we all want, but it's somewhat getting there.

My Denon 4308 has a surround setting which takes stereo input and outputs it to all of my (5.1) speakers. The Audyssey MultiEQ XT remains "ON". It is therefore possible to do the sub alone, the mains alone, mains plus sub (2.1), 5.0 and 5.1.

The surrounds alone isn't doable, but the effect of adding the surrounds to 2.1 and 2.0 should give some useful information on how well EQ'd they are, not to mention seeing how the overall EQ integrates everything.

At least this is what I'm puzzling over ...


Not that I've actually DONE it
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post #19 of 20 Old 07-27-12, 06:22 AM
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Re: Manual Response Testing - All 5.1 Channels

Most processors have a MULTI CHANNEL STEREO mode. I think this will work for testing all signals. Just unplug the speakers you don t want to measure and only plug in eg. your center channel and run a REW measurement.
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post #20 of 20 Old 08-23-12, 10:59 AM
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Lightbulb Re: Manual Response Testing - All 5.1 Channels

I used a Dolby Digital 5.1 / dts 5.1 encoder package to migrate a mono pink noise signal to the requisite format. (Unfortunately my 64 year old brain can't remember its name!). I set the level at -20 dBm and recorded 20 minutes of signal. Following that I burned the signals to a DVD. It serves as my calibration source.
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