Share your in-room measurements?

[Eetu]

Depends on the dimensions/layout of your room. Start with an equilateral triangle setup (distance between loudspeakers is the same as the distance from loudspeaker to listening position).

If you want to share your in-room measurements you first need a measurement mic. Here's a great tutorial to get you started:

lay these speakers on the back facing the ceiling and see what happens.

I don't think that's a good idea..

Use the search function and read more about speaker placement, room modes, digital room correction etc. Feel free to share any in-room measurements when you are ready!

 

[IPunchCholla]

First measurement. LP1 about 4 feet from speakers.

Got some work ahead dealing with base modes.

 

[TurtlePaul]

Got some work ahead dealing with base modes.

I bet the front of your speakers are 15” from the wall?

The 225 hz thing is almost certainly SBIR and not a bass mode.

Bass modes tend to be peaks and <100 hz unless you have a very low ceiling.

 

[IPunchCholla]

I bet the front of your speakers are 15” from the wall?

The 225 hz thing is almost certainly SBIR and not a bass mode.

Bass modes tend to be peaks and <100 hz unless you have a very low ceiling.

Thanks! They are. Difficult to position them elsewhere in that room. Im assuming I should start with treatment behind the speakers and bass traps in the corner?

 

[YSC]

Thanks! They are. Difficult to position them elsewhere in that room. Im assuming I should start with treatment behind the speakers and bass traps in the corner.

Maybe try some furnitures to diffuse the sound in rear wall? that distance the bookshelves etc. likely works. seems like the extreme highs are a bit shelved up also, worth EQing a bit?

 

[TurtlePaul]

I have been playing around with my filters more. Four filters, with the highest at 325 hz:

74 hz, - 7 dB, Q=6 - This is my highest bass node, I could maybe address the one in the 40s, but the lowest is at 25 hz where my sub is rolling off anyways.

140 hz, +6 dB, Q=1.1 - This is to address what I believe is my coffee table and TV console bounce which is less than a foot below the speaker level.

250 hz, +5 dB, Q=6 - This I believe is addressing SBIR off my back wall.

325 hz, -5.5 dB, Q=3 - I don't know why, but I have some extra power at this level. I may back this one off by 1-2 dB.

I have just been adjusting the room with good effect, but I am tempted to try +2-3 dB centered at 1.65 kHz, Q approx. 3 to see that they sounds like.

 

[IPunchCholla]

Been having fun using REW to produce different EQ filters: 0 Slope 1db flatness from 20-20k, 1.0 slope, 2.0 slope, those variations for just the lower frequencies, those variations for slightly relaxed fit. Based on all of that, it looks like in my room at least, trying to equalize upper frequencies creates a number of humps (room modes?) in the midtowns and up. Below is without and with a 1DB fit from 20-20000Hz with no room curve (just a fitted flat dB target).

So I decided on a 2dB fit from 2 to 3000HZ at a room slope of 2.0 and added a low and high shelf. I was going to measure again, but my wife is going to bed so that will have to wait.

 

[bjmsam]

After reading the Comb Filter Effects thread and reviewing the Impulse Responses page in the REW documentation and being inspired by the string method, this morning I measured L and R separately from the MLP, plotted the results in the Impulse window, and used CTRL - Right Mouse Button to estimate the primary reflection distance to confirm that the ceiling indeed is at fault. I'm finding few options for drop ceiling diffusion so most likely will end up adding more absorption to a room that already is pretty dead...

Treating the ceiling eliminated the reflection as anticipated.

Before:

After:

Clarity and imaging have improved but comb filtering remains audible and annoying. IDK where to go from here, so suggestions would be most appreciated.

 

[ernestcarl]

Treating the ceiling eliminated the reflection as anticipated.

Before:

After:
View attachment 187373

Clarity and imaging have improved but comb filtering remains audible and annoying. IDK where to go from here, so suggestions would be most appreciated.

View attachment 187374

View attachment 187375

The cause may be the very early reflections under 0.5ms — could it be the chair or from another nearby surface?

 

[bjmsam]

The cause may be the very early reflections under 0.5ms — could it be the chair or from another nearby surface?

REW estimates ~5" for those very early reflections that appear in both the left and right graphs (-20dB is enough to be so disruptive?). Removing the speaker grille resulted in no measurable difference, so I will try removing the chair (which is fabric, but perhaps more reflective than assumed?) and measuring from additional locations in hopes of tracking this down. Thank you!

 

[warthor]

Hi All,

Here are some of my first measurements. I definitely need some help. I recently purchased the umik and MiniDSP 2x4HD to work on the subwoofer response (which I am pretty happy with overall for only having a single subwoofer). I would like the curve to be much more flat and wonder why the subwoofer response is so elevated. This is after running and correcting the subwoofer response and moving the subwoofer around in YPAO to align the sub and main. Any help is appreciated!



KEF R7, Klipsch R-115SW, Yamaha A3070

 

[YSC]

Hi All,

Here are some of my first measurements. I definitely need some help. I recently purchased the umik and MiniDSP 2x4HD to work on the subwoofer response (which I am pretty happy with overall for only having a single subwoofer). I would like the curve to be much more flat and wonder why the subwoofer response is so elevated. This is after running and correcting the subwoofer response and moving the subwoofer around in YPAO to align the sub and main. Any help is appreciated!



KEF R7, Klipsch R-115SW, Yamaha A3070


View attachment 189689

did you do EQ already? that looks pretty normal sub behavior with room boundary gain and generally the overall FR looks pretty good

 

[ernestcarl]

Hi All,

Here are some of my first measurements. I definitely need some help. I recently purchased the umik and MiniDSP 2x4HD to work on the subwoofer response (which I am pretty happy with overall for only having a single subwoofer). I would like the curve to be much more flat and wonder why the subwoofer response is so elevated. This is after running and correcting the subwoofer response and moving the subwoofer around in YPAO to align the sub and main. Any help is appreciated!



KEF R7, Klipsch R-115SW, Yamaha A3070


View attachment 189689

Don't know about YPAO, but it would be helpful if you could post an image overlay of the sub only and main(s) speaker response traces with and/or without EQ.

 

[Erici]

Hi All,

Here are some of my first measurements. I definitely need some help. I recently purchased the umik and MiniDSP 2x4HD to work on the subwoofer response (which I am pretty happy with overall for only having a single subwoofer). I would like the curve to be much more flat and wonder why the subwoofer response is so elevated. This is after running and correcting the subwoofer response and moving the subwoofer around in YPAO to align the sub and main. Any help is appreciated!



KEF R7, Klipsch R-115SW, Yamaha A3070


View attachment 189689

A simple action to try: Reduce the gain on your sub by about 4 dB and see how it sounds.

 

[Steve Dallas]

Thanks! They are. Difficult to position them elsewhere in that room. Im assuming I should start with treatment behind the speakers and bass traps in the corner?

If your speakers are near the side walls (within 3 feet), corner bass traps can help. You should also benefit from treating the front wall, although you need a minimum of 4" thick absorption behind the speakers to reach decent effectiveness down to 125Hz. The treated area needs to be at least 4 x 4 feet to have much effect.


Here is a little chart I made showing the NRC of common thicknesses of Owens Corning 703 (uncovered) at various frequencies:

You start to realize usable bass absorption at 4". Six inches is much better if you have room for it.

Here is a table showing the SBIR frequency at different front baffle differences from the front wall. This does not account for the additional cancellation effect of floor, ceiling, or side wall bounce. (This is how TurtlePaul knew your speakers are 15" from the front wall). The formula is 340 / (4 * distance (m)).

Distance (in)	Distance (m)	SBIR Frequency (Hz)
12	0.3048	279
13	0.3302	257
14	0.3556	239
15	0.381	223
16	0.4064	209
17	0.4318	197
18	0.4572	186
19	0.4826	176
20	0.508	167
21	0.5334	159
22	0.5588	152
23	0.5842	145
24	0.6096	139
25	0.635	134
26	0.6604	129
27	0.6858	124
28	0.7112	120
29	0.7366	115
30	0.762	112
31	0.7874	108
32	0.8128	105
33	0.8382	101
34	0.8636	98
35	0.889	96
36	0.9144	93
38	0.9652	88
40	1.016	84
42	1.0668	80
44	1.1176	76
46	1.1684	73
48	1.2192	70
50	1.27	67
52	1.3208	64
54	1.3716	62
56	1.4224	60
58	1.4732	58
60	1.524	56
62	1.5748	54
64	1.6256	52
66	1.6764	51
68	1.7272	49
70	1.778	48
72	1.8288	46
74	1.8796	45
76	1.9304	44
78	1.9812	43
80	2.032	42
82	2.0828	41
84	2.1336	40
86	2.1844	39
88	2.2352	38
90	2.286	37
92	2.3368	36
94	2.3876	36
96	2.4384	35
98	2.4892	34
100	2.54	33
102	2.5908	33
104	2.6416	32
106	2.6924	32
108	2.7432	31
110	2.794	30
112	2.8448	30
114	2.8956	29
116	2.9464	29
118	2.9972	28

As you can see, you have to move your speakers waaaaaaaaaaaaay out from the front wall to remove any audible SBIR concern from its influence. No one I know has a listening room that large.

 

[IPunchCholla]

I’ve been building sound absorption. Right now I have 4” thick sheets (15”x48”) in the front and rear corners. That made a difference bass is much smoother sub up to the SBIR induced drop. And that is easier to fill. I’m planning on putting 4” thick behind each the speakers too, and maybe on the front wall between them. I think my reflections will also improve with smaller panels in the upper corners, but I’ll finish the corner ones (built the frames this weekend for the corners, I hope to cover next weekend). Build the behind speaker ones, then measure and see where I’m at.

 

[sharock]

Below is the in-room measurement of the D&D 8c from Erin's review, measured in his living room, plotted with the Klippel predicted in-room response. I'm curious, would this be considered a "good" in-room response? Clearly the bass <50Hz needs bringing down, but even with the cardioid performance there is a lot of unevenness below 1KHz. How audible would this jaggedness be? Can room EQ fix the in-room response considering all the dips? I imagine there are many people here with typical, untreated living rooms. Is this the best we can hope for even with a SOTA speaker like the 8c?

 

[YSC]

Below is the in-room measurement of the D&D 8c from Erin's review, measured in his living room, plotted with the Klippel predicted in-room response. I'm curious, would this be considered a "good" in-room response? Clearly the bass <50Hz needs bringing down, but even with the cardioid performance there is a lot of unevenness below 1KHz. How audible would this jaggedness be? Can room EQ fix the in-room response considering all the dips? I imagine there are many people here with typical, untreated living rooms. Is this the best we can hope for even with a SOTA speaker like the 8c?

I would say it looks darn good. The few deviations are obvious various room modes where simple eq can deal with easily

 

[abdo123]

Below is the in-room measurement of the D&D 8c from Erin's review, measured in his living room, plotted with the Klippel predicted in-room response. I'm curious, would this be considered a "good" in-room response? Clearly the bass <50Hz needs bringing down, but even with the cardioid performance there is a lot of unevenness below 1KHz. How audible would this jaggedness be? Can room EQ fix the in-room response considering all the dips? I imagine there are many people here with typical, untreated living rooms. Is this the best we can hope for even with a SOTA speaker like the 8c?

Yes that’s pretty much what to expect. You can use EQ to bring some high Q resonances like at 120Hz and shelf the bass a bit below 50Hz and that’s it.

 

[sharock]

I would say it looks darn good. The few deviations are obvious various room modes where simple eq can deal with easily

The dips just below 200Hz and at 250Hz are 7dB below the PIR. Are these easily dealt with by EQ? I keep reading on here not to EQ up dips.