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Newbie with REW, quite odd result

1255 Views 7 Replies 2 Participants Last post by  red5goahead, 
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Hi guys

I'm using Rew since a couple of days. I've a Velleman Avm2050 and a Audyssey Mic

the graph below is taken with a Audyssey Mic setup. no problem with my Realtek 887 . I calibrated it without any issue and I've the related cal file

I got this kind of odd result

the red line is the 20-200 Hz , 1M lenght test with Marantz Sr5009. No EQ , large speakers (no cross-over)
the blue line is the 20-200 Hz , 1M lenght test with Marantz Sr5009. No EQ , small speakers (cross-over 80)
the blue line is the 20-200 Hz , 1M lenght test with Marantz Sr5009. No EQ , small speakers (cross-over 250)

front speaker are 70 hz. -3 db as reference frequency response

the sub is OFF

Image hosted for free at CtrlV.in

where are the cross-over cuts? :ponder:

PS: the cross-over works, my ear hear the difference

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Wayne A. Pflughaupt
What do you mean, “the sub is off?” That you turned it off directly (e.g. power switch), or in the receiver’s menu? If the latter, then I wouldn’t expect the crossover to be active.

Also, with some receivers the crossover does not work in straight stereo mode.

Regards,
Wayne
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Yes, the sub was swithed-off. I'm trying to determine the correct cross-over cut point monitoring the main speaker without the sub. But I can't
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New test with the Velleman avm2050 on the front speaker (the sub is powered-off)

I don't understand the values on axixs.

the cross-overs are working because they are changing the initial point of the high-pass filter but the values on the axixs seems totally broken. The highest one (120 HZ) start on almost 55 HZ not 120 HZ (the blue line)

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Wayne A. Pflughaupt
I would concur with your conclusion that something is wrong with the crossover.

Regards,
Wayne
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No, my guess is that a kind of issue with Rew when collect the data or when display it, maybe related to my pc desktop or the sound card. Cross-overs seems work fine because despite the results the differences between 80-90 HZ and 200-250 HZ setups is clearly, evident during a subwoofer check level test. (I used the Marantz web interface to switch quickly the cross-overs).
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Wayne A. Pflughaupt
A good way to double-check would be to take SPL readings of sine wave signals at the crossover frequency and one octave below. There should be ~ 24 dB difference.

Regards,
Wayne
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Ok

yes, there is a problem with the spl meter (velleman avm2050).

the difference is -0.3 Db

I have to investigate of mic/spl meter.

Image hosted for free at CtrlV.in

Image hosted for free at CtrlV.in

Is it a problem if I''m using the line-in (right) of the sound card and the mono from the Spl meter and the Hdmi device as the output (stereo) ?
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