REW - Mains + Sub First Results - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 19 Old 05-04-13, 12:44 PM Thread Starter
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REW - Mains + Sub First Results

I would like to ask your help in order to understand my first measures using REW.
My first experience was measuring the mains + sub.
Below are the SPL and the Waterfall graphs.
Attached Thumbnails
REW - Mains + Sub First Results-spl.png  

REW - Mains + Sub First Results-waterfall.png  

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post #2 of 19 Old 05-05-13, 08:26 AM Thread Starter
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Re: REW - Mains + Sub First Results

Today i've remove the mains out of the equation, in order to analyse the subwoofer only.

In attach, i insert two more graphs, namely :

- SPL for the sub only
- Overlapped SPLS curves for the Mains (L+R) and the isolated SUB.
- Waterfall for the sub only

I've also inserted a picture of my room, showing the speakers positions.
The room is an attic, and its visible in the right corner, the inverted V shape of the roof, made of a plasterboard material.

The Speakers are XTZ 99.26, sub a BK XLS200, and the AV has a 80Hz crossover.

When watching a movie, with very low frequency sounds as helicopters, car engines, sometimes the roof vibrates a lot.
Looking to the charts, it seems that the frequencies the 44.5 peak is responsible for it.

Would it be possible to help analyse this graphs with more detail?
Thanks in advance

Now the pictures :
Attached Thumbnails
REW - Mains + Sub First Results-spl_sub_only.png  

REW - Mains + Sub First Results-waterfall_sub_only.png  

REW - Mains + Sub First Results-spl_sub_vs_mains.png  

REW - Mains + Sub First Results-screen.jpg  

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post #3 of 19 Old 05-05-13, 08:52 AM
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Re: REW - Mains + Sub First Results

Looks like some long decay times, probably a fairly live room in general. Some LF absorptive materials & treatment might be in order, maybe a bass trap or two. Looks like your measurements are basically sound. Can you post your .mdat file?
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post #4 of 19 Old 05-05-13, 09:14 AM Thread Starter
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Re: REW - Mains + Sub First Results

Thank you very much for your time to analyse my data

Please download the mdat file from here: https://cloudpt.pt/link/df23b3d9-d1d...ull_Study.mdat

And attached is the room schematic
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post #5 of 19 Old 05-05-13, 09:29 AM
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Re: REW - Mains + Sub First Results

Have you tried placing the sub in different parts of the room IE a corner or along the side wall?
I do agree, just by looking at the picture you have a very bright room, reflection would be an issue for sure.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #6 of 19 Old 05-05-13, 09:45 AM Thread Starter
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Re: REW - Mains + Sub First Results

Quote:
tonyvdb wrote: View Post
Have you tried placing the sub in different parts of the room IE a corner or along the side wall?
Yes, initially the sub was placed in the left corner and i think the vibrations were greater in that position.
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post #7 of 19 Old 05-05-13, 04:54 PM
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Re: REW - Mains + Sub First Results

I think that room is a good candidate for some bass traps.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #8 of 19 Old 05-05-13, 10:52 PM
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Re: REW - Mains + Sub First Results

Quote:
neo_2009 wrote: View Post
The Speakers are XTZ 99.26
Matter of interest what do you think of these speakers fro music pluses and minuses?
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post #9 of 19 Old 05-06-13, 04:05 AM Thread Starter
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Re: REW - Mains + Sub First Results

Quote:
Phillips wrote: View Post
Matter of interest what do you think of these speakers fro music pluses and minuses?
They are very detailed, with a very open midrange and a wide presentation. The sound is very spacious and full and i particularly like their presentation of female voices like Eva Cassidy or Katie Melua.
There is a slight sibilance on the "sss" sometimes, but i think its due to this being the MKI versions. They are partened with an Arcam AVR 350 (and a BK XLS200), which i think its a wonderful combination.

For some time i add them a MF M1DAC using stereo direct and bypassing the Arcam's digital controls, connected the XLS200 by high level, and it was a fantastic combination for music.

I've previously had a Monitor Audio RS1, but sonically, the XTZ are far better speakers, they are at least at the Monitor Audio GS level. Obviously, to be able to provide this performance at its price level, there had to be some cuts, and its visible comparing the finishing materials on MA vs XTZ. The MA are a more polished product, the XTZ (at least the 99.26 normal black) aren't as refined.

For movies, i use them with the jumpers in the +3db position that elevates the treble by 3db, which adds some dynamic that is very well suited for movies.

All in all, i think they are an amazing value for money option.
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post #10 of 19 Old 05-06-13, 04:14 PM
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Re: REW - Mains + Sub First Results

Quote:
neo_2009 wrote: View Post
For movies, i use them with the jumpers in the +3db position that elevates the treble by 3db, which adds some dynamic that is very well suited for movies.
Ouch, I could never do that - I use a house curve to roll off the top end, otherwise it exascerbates my lovely case of tinnitus.


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