gadgtfreek
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Posts posted by gadgtfreek
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If you open up REW and look to the right-most button at the top within the window, there is a button labeled "Room Sim". Click on that and you'll see a box that allow you to put in your room dimensions and your listening position. Under the "Speaker Controls" expandable window, you can check off having a left and right front speakers, and up to four subs. Then you can position those subs and fronts within the graphic window at the bottom left, making sure to check the "Show Elevation View" box to set the height above the floor for your loudspeakers and listening position.
When you finish inputting those values, then you can grab the listening position or any of the loudspeaker positions and move them around while looking at the FR window at the top right. This will show you interactively how your loudspeaker positions and sub placements affect the frequency response at the listening position for all frequencies up to about 200 Hz (i.e., the "sparse room mode region").
Voila!
Chris
Freaking sweet!!!
I admit I havent had time between work, learning REW basics and getting my laptop setup to play with more than the measure and SPL features. I may send another donation REW's way, the software really is cool.
On that note, I went ahead and ordered a verified CM140 SPL meter from Cross Spectrum. I am seeing some odd issues using the Umik 1 as an spl meter, and when comparing the Umik 1 numbers to the SPL meter I have, my ears tell me the SPL meter is giving a better level result. I have no choice but to level match after XT32 completes because the 64ii adjustment bottoms out at -12db. So, it is very important that I can accuracy match the subs and speakers to 75db at reference volume on my preamp. The CM140 is good for 31.5hz to 8khz and the -30 and -40dbfs tones on the blu-ray I have are 30hz to 2khz pink noise.
I spoke with Herb at cross spectrum about this yesterday, and I gotta go with the recommendation from the guy who went to MIT and is engineer.
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http://gikacoustics.co.uk/what-are-room-modes/
Found that. I need to do the calculations tonight or tomorrow and see what it tells me.
Below is the formula for calculating all room modes, not just the axials.
F = c/2 * sqrt(p^2/L^2 + q^2/W^2 + r^2/H^2)F= Frequency
c = speed of sound (1130 feet per second or 344 meters per second)
sqrt = Square Root
^2 = squared
L = Length of Room
W = Width of Room
H = Height of Room -
Run after the new sub was put in. The sub response from 10-80 is better with one rythmik and one hsu, vs two hsu's. makes me wonder what it will be like when I get the second rythmik. it digs to 12hz.
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Pics and observations:
I like the finish better than the HsuAmp knobs with the "clicks" are a lot easier to adjust when trying to get the volume right for audyssey, and trying to hit a certain spot in generalPrefer the matte finish to the Hsu. Hsu shows touch spots from an arm or hand, FV15HP does notLove that it is slightly smallerThink the full face cover (can't see ports) looks better, especially with dustThe way it was packed with images on how to unpack was well thought outFit in finish over all seem to be a step (slight) over that of the HsuBeefy power cord
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Just swapping one sub out made an improvement to my eyes, have to test the ears later. Also wanna do some SPL checks with the test tones and movie scene at reference volume and see what happens.Dual VTF'sOne FV15HP and one VTFMK4
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Sweet.
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Only thing that keeps me with D&M is XT32. Its proven to do a good job and has dual sub eq. MCACC was rough at first but the Pro versions have come a long way.
And right now Dirac is putting the heat on Audyssey, who hasnt changed much in a few years.
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...so I can probably work out the sub dip at 22hz with it.
That looks like a room mode at 22 Hz. What are the dimensions of your room and where did you place your microphone relative to the subwoofer(s)?
You can usually see if there is a room mode issue by looking at the group delay plot in REW--if GD is high at the frequency area of interest, you're probably looking at room mode or speaker placement.
Are you running an upsweep from REW and using that to drive your system, or are you using a CD to generate a drive signal?
Chris
I used the REW and my laptop as the up sweep generator.
I am going to have to do more reading on null's and room modes, etc... I am a newbie at this for sure. The subs are on both sides of the tv stand, by the fronts and the measurement was taken at the MLP about 10.5 feet away.
I probably will not attack anything further until I get both subs changed out and see what I am dealing with too, so I have some time to research the problem. The subs are where they are too, I cannot move them anywhere else.
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It copies the "base curve" over, not the final result where audyssey has applied the filters. The 9 band eq's cannot make the adjustments needed to best the audyssey cal.
https://audyssey.zendesk.com/entries/474096-Audyssey-adjustments-and-manual-EQ
Next time I have my AV guy over we are gonna talk Gik acoustic panel placement.
I am not in any hurry for the dsp, I am real happy with XT32. I mainly got into REW for subwoofer tinkering, and I still have another subwoofer to pay for
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IIRC, using the manual eq copying over the base curve limits you to the 9 band eq and none of the high resolution filters XT32 uses. Probably not the best move.
The best move really is a device with a parametric eq built in, and then use REW or Dirac to calibrate it from the get go.
Knowing my upgraditis I am sure I will end up with a mini dsp...
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They are in Florida, and usually ship a product the next day. So its not bad.
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Id take the integra or 4520, XT32 is worth it.
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It def does a good job IMO, when you compare off and on. I have always been happy with XT32 when done right, and when speakers are setup right. My main purpose for getting into REW was to see what changes would do, like the sub tuning, and to be able to more accurately level match.
I may get into Dirac down the road, but thats about $900.
Coolest thing about REW is all I have in it is $25 for a long HDMI and USB ext cable, $110 for the mic, and the donation I sent the guy that writes REW. CHEAP.
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None really that I know of. I can't make any adjustments to XT32 other than level match and I did that, distances are OK. My next step would be a minidsp with Dirac, but I gotta get my second sub first. As far as the sub, I can run in low freq tuning or 24hz, and obviously low freq is better.
I checked output with test tones from 16hz to 80hz on a CD I have. 17hz mode yielded 10db more at 16 and 20, and was pretty much the same at levels higher than that. Tested using reference volume on the AVR.
I think the FV15HP's have a parametric EQ on them so I can probably work out the sub dip at 22hz with it.
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Yeah, Im learning. I re-did it because these two subs in 25hz tuning were not good at all, should have been running in max extension mode because now the 16-20hz is flat and only about 5db off 40-60 and close to 25-40.
This will give me a good comparison for tomorrow when I swap one VTF15 for the Rythmik, and then once I can install the second Rythmik.
One other great thing is, since I have to level match the 64ii since XT32 bottoms it out, I feel a lot more confident using an audio blu-ray, REW and the Umik-1 for accurate SPL adjustments (matching all speakers to 75db with pink noise).
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It was a chore, but I got it all going and was able to test my setup. Especially wanted to do this before the sub change.
XT32 OnXT32 OffXT32 "Flat" -
I run 3.2 with XT32 and dual sub eq and love it.
I have two friends with decent 5.1 setups and theirs does not sound as good as mine. Probably because of the quality of their speakers, placement/setup, and lack of quality subwooferage...
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Those older Panny's with their in house Uniphier chip had amazing PQ, but they did cheap up on build to drive down pricing. When they switched to mediatek chipsets in 2013, they started clipping chroma resolution when I checked on spears and munsil, really pissed me off because they were my favorite player. Sony got better at what they do, so they are the best "cheap" and "accurate" right now. The current Panny app offering is not as good as the Sony either.
I think the Uniphier chip comes back from the dead in the new UHD player coming from them late this year, so hopefully Panny can get it's mojo back.
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Its not a big deal when you get used to it.
The brightness patterns are straightforward, just adjust up until you see everything, and then reduce until part disappears. Contrast you can go as high as you want as long as the long ramps don't pink or change colors, or you start clipping out too much bright white.
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Its not bad, and if you hit up on the directional control on the remote, you get instructions for each pattern. Setting brightness, sharpenss and contrast do wonders.
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FYI, I got in a 2015 Sony 1500 ($79) and 6500 ($129) yesterday.
I like the new menu's better than the XMB, their styling is PS4 all the way but better than the drunk pyramids. The 6500 has a similiar Sony video chip to the BDP-7200 from last year, for 4K scaling I assume. The cheaper 1500 has less ram on board than the 6500/7200 which is to be expected, and the 1500 and 6500 have the same model drive which is a newer model number than the 7200/1200 share.
It passes spears and munsil tests just fine, so looks like another reliable year from Sony players. They didn't really change much that I can tell by looking at the chips, other than the older models have nanya ram and the new ones have Samsung.
the 6500 will be my new HT player and the 1500 is replacing the much slower 1200 for my bedroom streamer. Oppo is sold to help fund sub upgrades
Audio is more a priority for me nowadays, especially since I mainly watch blu-ray.
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Yes!
Not sure if different subs will make a difference, but Rythmik designs their stub with music in mind first.
I also go my Umik 1 in and downloaded REW. i am going to play with that Thursday.
Pure direct 2.0 doesn't usually use the Subs anyway. Does your marantz?
No, its fronts only. Just curious how the FV15HP's will sound with music.
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Man, shipping dept. isn't messing around!
Reference Number 2: FV15HP-BM with H600PEQ3
Scheduled Delivery:06/03/2015From:Rythmik Audio -
Yes!
Not sure if different subs will make a difference, but Rythmik designs their stub with music in mind first.
I also go my Umik 1 in and downloaded REW. i am going to play with that Thursday.
XT32 Results as Tested with REW
in Home Theater
Posted
Looks like the left sub is the issue. I input all the heights for the front and left speaker, the two subs, the distance for all them, the room measurements and the MLP data.
When I highlighted each sub, the sub to the right was fine, but the sub to the left just drops off the chart under after it makes that 24hz bump. If I put the subs back to where they were on the outside of the fronts, instead of inside, the right sub is still fine and the left sub peaks up the match the "main" graph very closely. I wonder if I should not move my fronts back inside as it seems the farther spread out sub 1 is on the left the better under 30hz.
Left sub inside
Right sub inside
Left outside
Rigtht outside