REW Forum

**ngiachino** · **07-07-09, 09:37 PM**

I read over the help documentation, and I'm pretty confident I've calibrated properly, but these response graphs look a little crazy past 180hz.

I'm using a behringer emc8000 mic, behringer 802 mixer, and my onboard soundcard. Measurements were taking from my listening position.

Here is an example of the graph I got...(remove *....couldn't post link since I'm new here)

img21.imagesh*ck.us/img21/5048/nikg.jpg

**brucek** · **07-07-09, 10:05 PM**

Quote:

couldn't post link since I'm new here

Go to the Post padding thread and make 5 dummy posts and then post your pic.

brucek

**ngiachino** · **07-07-09, 10:08 PM**

Got it...

**ngiachino** · **07-07-09, 10:11 PM**

Pic of bookshelf speaker set in built-in bookshelves.

[IMG]

[/IMG]

**robbo266317** · **07-07-09, 10:35 PM**

That's not a bad response for a bookshelf.
For full range you may want to use 1/3 octave filtering.

**ngiachino** · **07-07-09, 10:38 PM**

The speakers are a diy build I did with the help of some forum members. They use usher 8945p mid-range and peerless hds tweeters in a .5cuft enclosure. This is my first xover...so I'll probably look to doing some tweaking once I know for sure I'm generating these measurements correctly.

**wackii** · **07-08-09, 01:43 AM**

Quote:

ngiachino wrote:

Pic of bookshelf speaker set in built-in bookshelves.

[IMG]

[/IMG]

I wish my response graph looks like this at listening position.

Al,

**brucek** · **07-08-09, 06:49 AM**

Quote:

I wish my response graph looks like this at listening position

You're being overly kind to yourself with respect to your graphing axis values.

You're using a vertical axis of -60 to +130dB (190dB spread). This would make most speakers look great. You should switch to the standard 60dB spread we use here with a vertical axis of 45dB-105dB. This centers the 75dB target around a plus and minus 30dB spread.

For full range measurements you need to turn on smoothing. This feature removes the comb filtering and reveals the underlying trend of the signal for easier evaluation.

brucek

**ngiachino** · **07-08-09, 08:49 AM**

Changed the axis and put on 1/3 octive smoothing...

**brucek** · **07-08-09, 08:54 AM**

Yeah, that's good.

Quite a dip at ~200Hz to examine..

I guess now you can do some near-fields or outside measures to try and remove external influences, so you can see how the speakers are performing.....

brucek

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