Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 411 - AVS Forum
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post #12301 of 12321 Old 11-26-2014, 08:11 PM
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Originally Posted by aaranddeeman View Post
All righty..
Yes my AVR has Audyssey MultEQ XT
I will get to the next measurements tonight at some point.
Thank you for being patient with me.
Take your time. You should run the calibration before any more measurements. I assumed you have familiarized yourself with Audyssey best practices by reading the materials in the Audyssey thread. Following guidelines can make a difference between good and poor results.
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post #12302 of 12321 Old 11-26-2014, 09:04 PM
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Quote:
Originally Posted by AustinJerry View Post
Take your time. You should run the calibration before any more measurements. I assumed you have familiarized yourself with Audyssey best practices by reading the materials in the Audyssey thread. Following guidelines can make a difference between good and poor results.
Oh. I already took the measurements. But anyways I can repeat both after calibration as well.
But check them out in the mean time.
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post #12303 of 12321 Old Yesterday, 06:20 AM
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Some pretty steep roll off above 6kHz?? What is the spec of your mains?

Just a tip on using REW, it's almost always better to take a full range measurement and restrict your graph limits when focusing on the bass region. This way when someone asks to see the full range, the measurement is already done. It wasn't clear from your post if that's what you did so disregard if that's the case.
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post #12304 of 12321 Old Yesterday, 10:49 AM
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3 questions please ...

Do I need a laptop for REW, or can I use my Mac Mini ( I assume I can't use an iPad ) ?

I have the REW program, AudysseyXT, and the 2 PEQs on my PC13Ultra sub ... is there a preferred order involved ?

I have a Radio shack SPL meter ... should I invest in a better devise ?

Thank you :-)

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post #12305 of 12321 Old Yesterday, 11:42 AM
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This thread is focused more on Windows devices, although several participants do use Mac's. You cannot use an iOS device. A SPL meter will provide crude measurements, but a USB mic is required for serious measurements. The REW guide has microphone recommendations. I don't understand your "preferred order" question.
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post #12306 of 12321 Old Yesterday, 11:50 AM
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Quote:
Originally Posted by AustinJerry View Post
I don't understand your "preferred order" question.
Start with all eq off.
Play with your room, speaker placement, etc.
Then use the eq on the subs.
Then run Audyssey.
Repeat.
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post #12307 of 12321 Old Yesterday, 12:15 PM
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Originally Posted by LastButNotLeast View Post
Start with all eq off.
Play with your room, speaker placement, etc.
Then use the eq on the subs.
Then run Audyssey.
Repeat.
You would use peq after audyssey if you want to apply a house curve. They are not mutually exclusive either, you can do before and after if you like. Typical reason to eq before is to take down a big peak which then enables audyssey to focus filter resources on fine tuning.
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post #12308 of 12321 Old Yesterday, 12:52 PM
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Thank you Jerry and others for your help.
Now I guess I have fair understanding of how REW works.
I can start playing with it more and more.
Oh and also need to get the USB mic... That should bring in accuracy in the measurements...
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post #12309 of 12321 Old Yesterday, 12:56 PM
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Quote:
Originally Posted by jkasanic View Post
Some pretty steep roll off above 6kHz?? What is the spec of your mains?

Just a tip on using REW, it's almost always better to take a full range measurement and restrict your graph limits when focusing on the bass region. This way when someone asks to see the full range, the measurement is already done. It wasn't clear from your post if that's what you did so disregard if that's the case.
My mains are JBL Northridge E80
Good TIP on full measurement. I will remember when doing next round.
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post #12310 of 12321 Old Yesterday, 01:20 PM
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Quote:
Originally Posted by aaranddeeman View Post
Good TIP on full measurement. I will remember when doing next round.
you're using an RS SPL meter atm aren't you? if so there is no point measuring beyond ~2kHz, the mic in the meter is not remotely accurate beyond that point. This explains the apparent drastic rolloff in your full range measurements btw, it's just the mic. Generally speaking the RS SPL meter is perfectly fine for general purpose sub work, it increasingly rolls off below 30Hz but the generally available cal files get it into the ballpark. As long as you don't try to use it to shape <30Hz then you'll be ok.

If you want to do full range measurements then a proper mic is the cost of entry.
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post #12311 of 12321 Old Yesterday, 01:25 PM
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Originally Posted by aaranddeeman View Post
My mains are JBL Northridge E80
Good TIP on full measurement. I will remember when doing next round.
Well, I'm not sure how to explain it then as those speakers are rated +/- 3dB up to 20kHz. Your tweeter crossover is 4kHz and it's a pretty smooth roll off. Looks a bit like destructive interference when you measure the left and right together. Your sure both speakers weren't playing during measurement?
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post #12312 of 12321 Old Yesterday, 02:28 PM
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Quote:
Originally Posted by jkasanic View Post
Well, I'm not sure how to explain it then as those speakers are rated +/- 3dB up to 20kHz. Your tweeter crossover is 4kHz and it's a pretty smooth roll off. Looks a bit like destructive interference when you measure the left and right together. Your sure both speakers weren't playing during measurement?
You mean both playing even though I wanted to measure Left only and Right only?
I will recheck that..

Edit : Not sure if we should blame RS-SPL meter. My another set of measurements show the exact same roll off after 6K.

Last edited by aaranddeeman; Yesterday at 02:31 PM.
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post #12313 of 12321 Old Yesterday, 02:44 PM
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Originally Posted by aaranddeeman View Post
You mean both playing even though I wanted to measure Left only and Right only?
I will recheck that..

Edit : Not sure if we should blame RS-SPL meter. My another set of measurements show the exact same roll off after 6K.
Yes, on the first part. Sorry, I didn't realize you were using an RS-SPL as your mic. That's probably the issue.
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post #12314 of 12321 Old Yesterday, 03:17 PM
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Yes, on the first part. Sorry, I didn't realize you were using an RS-SPL as your mic. That's probably the issue.
Thanks. That's comforting...
I am trying to find the online retailer that has UMM-6 with 90 degree calibration available.
Can't seem to find it (I read somewhere @ AVS). Do you happen to have the link?
Really appreciate if you could post it.
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post #12315 of 12321 Old Yesterday, 03:30 PM
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Shame on you! That information is in the Guide, which you should have memorized by now.

Linky: http://cross-spectrum.com/measuremen...ated_umik.html
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post #12316 of 12321 Old Yesterday, 04:02 PM
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Originally Posted by AustinJerry View Post
Shame on you! That information is in the Guide, which you should have memorized by now.

Linky: http://cross-spectrum.com/measuremen...ated_umik.html
Opps. This is what happens when you have "live" help available, you overlook the guide...
Thanks Jerry...

Edit : I was going to get UMM-6. or should I get UMIK-1. Which one is most favored?

Last edited by aaranddeeman; Yesterday at 04:08 PM.
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post #12317 of 12321 Old Yesterday, 05:21 PM
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All explained in the Guide! Basically they are functionally equivalent.

BTW, you do know where the guide is, don't you?
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post #12318 of 12321 Old Yesterday, 05:46 PM
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Quote:
Originally Posted by AustinJerry View Post
BTW, you do know where the guide is, don't you?
Austin, TX
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post #12319 of 12321 Old Yesterday, 06:01 PM
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I used REW earlier today to tune the audio system in my new vehicle. Set up the USB mic and used a 3.5mm stereo cable to the AUX IN audio port on the car. I was able to find the optimal settings for an 8-band equalizer. Who said REW isn't a useful tool? I didn't bother installing any treatments though.
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post #12320 of 12321 Old Yesterday, 07:10 PM
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Before and after graphs!!!!!

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post #12321 of 12321 Old Yesterday, 08:44 PM
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Quote:
Originally Posted by AustinJerry View Post
I used REW earlier today to tune the audio system in my new vehicle. Set up the USB mic and used a 3.5mm stereo cable to the AUX IN audio port on the car. I was able to find the optimal settings for an 8-band equalizer. Who said REW isn't a useful tool? I didn't bother installing any treatments though.
Yeah. How about some "pink fluffy" dangling allover the inside of it..
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