Help analyzing results REW

[ciotime]

Hi...I'm fairly new to REW and would really appreciate all the inputs I can get. I've attached here some of the results needed and would hope for anyone to point out the issues that need to be addressed. My HT room is 13'X19'X8. I used to run dual subs but recently sold them and only using 1 SVS PB1000 at the center portion of the front below the center speaker. The center speaker is actually on top of the SVS sub. I haven't been able to get hold of another PB1000 coz in my country there's no stocks as of the moment. I might just get the new PB1000 PRO as the second sub or maybe get 2 of them once it's in stock here and have a 3 sub setup. Thanks.

 

[Pogre]

I'd really like to know how to interpret the RT60 chart myself. Mine doesn't look anything like yours does. Mine just looks like random, unconnected slashes, tho I haven't looked at mine in a long time and there have been updates to REW since then.

I get a rough idea of what your fr looks like based on the waterfall chart, but you didn't actually post it...

If you get a pair of pros you can make some adjustments to shoot for a flatter response. Then again, maybe you can now. What other gear are you running? A more detailed description of your room, seating distance and gear would be helpful. Post up your spl only fr chart too!

*Edit: Your low bass response based on what I can see does look pretty smooth from 70 hz and down with what looks like a built room curve. What all have you done for eq in those charts? Any? Room corrected, pure direct?

 

[William Lemmerhirt]

I'd really like to know how to interpret the RT60 chart myself. Mine doesn't look anything like yours does. Mine just looks like random, unconnected slashes, tho I haven't looked at mine in a long time and there have been updates to REW since then.

I get a rough idea of what your fr looks like based on the waterfall chart, but you didn't actually post it...

If you get a pair of pros you can make some adjustments to shoot for a flatter response. Then again, maybe you can now. What other gear are you running? A more detailed description of your room, seating distance and gear would be helpful. Post up your spl only fr chart too!

*Edit: Your low bass response based on what I can see does look pretty smooth from 70 hz and down with what looks like a built room curve. What all have you done for eq in those charts? Any? Room corrected, pure direct?

I can only offer a little bit on this but...
To my eye, there’s a little ringing below 40hz but it’s not too bad considering the slight house curve.
I’m sure you’re bored with nothing else to do so, if you get a chance, the help files in REW are a gold mine. Albeit long and deep.

 

[Pogre]

I can only offer a little bit on this but...
To my eye, there’s a little ringing below 40hz but it’s not too bad considering the slight house curve.
I’m sure you’re bored with nothing else to do so, if you get a chance, the help files in REW are a gold mine. Albeit long and deep.

Yeah, I see that too. Looks like the bulk of it is below 30 tho. Like you said, doesn't look too bad.

Those help files are long and deep man. I'm hoping someone can give me the abridged version, lol.

 

[William Lemmerhirt]

Yeah, I see that too. Looks like the bulk of it is below 30 tho. Like you said, doesn't look too bad.

Those help files are long and deep man. I'm hoping someone can give me the abridged version, lol.

I’m sure there is a condensed version somewhere buddy. There was a time I could’ve given something used off the top of my head. Those days are gone.....lol

 

[ciotime]

Thanks...I also posted the same question to Steven Smith ( hometheaterguru ) and he said its a little bit on the damped/dead side. He said the RT60 shows the decay time at just a little over 200ms. I quote " sub response looks good, room rt60 is really low and looks to be heavily absorbed. That would he my first issue to fix. It barely breaks 200ms. Definitely on the dead side. "

 

[PENG]

Thanks...I also posted the same question to Steven Smith ( hometheaterguru ) and he said its a little bit on the damped/dead side. He said the RT60 shows the decay time at just a little over 200ms. I quote " sub response looks good, room rt60 is really low and looks to be heavily absorbed. That would he my first issue to fix. It barely breaks 200ms. Definitely on the dead side. "

Did you tell him about your room size? If I understand right, in a smaller room RT60 is not meaningful for domestic rooms that tend to be small (relatively I assume). It's probably okay for the higher frequencies though.

See John's response in post#2:

RT60 at low frequencies ? | AV NIRVANA

 

[Pogre]

Did you tell him about your room size? If I understand right, in a smaller room RT60 is not meaningful for domestic rooms that tend to be small (relatively I assume). It's probably okay for the higher frequencies though.

See John's response in post#2:

RT60 at low frequencies ? | AV NIRVANA

Well that answers a long standing question I had about RT60...

"RT60 is not meaningful at very low frequencies as behaviour there is dominated by modal resonances. Use the waterfall or decay graphs to observe low frequency behaviour."

That might explain why no one has ever commented on a RT60 chart for all of the graphs I've posted here over the years. I've always been primarily focused on bass.

 

[PENG]

Well that answers a long standing question I had about RT60...

"RT60 is not meaningful at very low frequencies as behaviour there is dominated by modal resonances. Use the waterfall or decay graphs to observe low frequency behaviour."

That might explain why no one has ever commented on a RT60 chart for all of the graphs I've posted here over the years. I've always been primarily focused on bass.

Iirc, your waterfalls look good. The thing is, none of those graphs REW offered are totally useful in all ways, but they are all useful in certain ways and under certain conditions. John Mulcachy deserves some sort of awards, wish Nobel has a category for contribution in this field.