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131 Posts
Discussion Starter · #1 ·
I was wondering how accurate or inaccurate the newer digital RS meters are in the higher frequencies. I know they are pretty close in the bass region.

But I ask because this is the result I got with REW from my Ascend 340SE center channel (I had the receiver in DPL II Movie) + sub, with the meter on a tripod in the LP aiming diagonally up, as well as aimed forward.

Aimed diagonally up:

Aimed straight forward:

In my room I do have absorber panels on the left/right sides, and I have a large 3~4" thick floor cushion that I put on top of the large square coffee table.

Any idea why the frequency response looks like this in the highs?

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131 Posts
Discussion Starter · #3 ·
BTW, here are graphs that show very close to what I have right now.

I have bass traps (2x GIK Acoustics 244 panels in each front corner, with a 224 panel at each 1st ref point), along with a BFD, of course, eqing my HSU VTF-3 MK2. Speakers are Ascend 340SE (3 across front).

The graphs show interaction between the sub and the 2 mains, with crossover on sub disabled, set to 80Hz in receiver, and sub running with 180-deg phase in Max Extension mode (1 port plugged).

Here's my filters, probably over-done a bit by I'm **** about getting flat response.

Freq BW Adjustment
24Hz 8 -3
30 10 -4
48.5 3 -5
40 6 -7
44.5 6 -12
53.25 3 +6
72.35 10 -16
83 6 -5
51 2 +4
89 2 +6
37.88 3 +3
100 4 -7

After I did these graphs, I eased up on the cut at 73.25 (was -19) amd at 30Hz (was -6), as well as easing up on the cut by 1dB or so around 100 (was -8 or -9). I also backed off the boosts at 53.25 and 89 (both were +7). Those were the filters when the graph was taken, and the above list was what I currently have - slightly different than how the graphs now look.

The first graph should be the standard dimensions used here - 15Hz to 200hz, 45hz to 105Hz high. For the second one I widened it a bit to see the response to 10Hz rather than 15Hz.


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131 Posts
Discussion Starter · #4 · (Edited)
I would use 1/3 or 1/6 octave smoothing... it's almost impossible to read a response graph full resolution in the high frequency range.
Still, that's a 7dB or rise around 5K, and then it falls 30dB starting at 10KHz. Is that C-weighting, or just something with my sound card/setup?

I also just read this:

So I guess I need to do different tests that focus on just the high range. Another thing is, REW often (always?) tells me the signal coming from the SPL meter is clipped. I guess I'll just run some different tests.

And on another thread on another forum, someone said that RS meters aren't good with treble frequencies. Is there a .cal file that can be used for measuring up through 20K~?

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131 Posts
Discussion Starter · #7 ·
That's correct. Don't use an RS meter for full range. You need to purchase a better microphone for that job.

That's good to know. I guess... So I won't bother with full-range measurements then. Don't feel like buying a better mic right now.

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131 Posts
Discussion Starter · #9 ·
I moved my speakers tonight, experimented with REW some more, etc. I redid my BFD filters, on a different filter grouping, and instead of having a bunch of cuts, I only used a few filters and lowered the gain on the sub.

Here's my results, current filters:
Freq BW Cut/Gain
74Hz 6 -13
45Hz 8 -7
66Hz 2 -4
54Hz 8 +4
37Hz 4 +4
53Hz 3 +2

Attached graphs are:
10-20KHz, 1/3 octave smoothing
15-200Hz, sub+ speakers, no BFD
15-200Hz, sub+ speakers, Current/above filters
10-400Hz, sub+ speakers, Current/above filters, 1/12 octave smoothing


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