First graph. What do you guys make of this?!

[kengrayfield]

Hello, I am pretty new to REW. But after a day of good reading, I have gotten a pretty good idea on things. Below are my measurements for left and right respectively (with filters included).





What's going on there around 200hz??!

[brucek]

Below are my measurements for left and right respectively (with filters included)

Are you considering using parametric filters at the frequencies indicated? Usually electronic parametric equalization is limited to subwoofer frequencies (i.e. < 100Hz), as room treatment is considered the best method to tackle problems associated with the mains (100Hz-500Hz).

The range that filter corrections are effective is much larger at low frequencies. At frequencies above subwoofer range, the effective listening area improvement of a corrective filter is quite tiny (smaller as the frequency increases) and so is of little value. Filters at these frequencies could easily make things worse.

Narrow peaks or dips would not be audible, nor would they respond to equalization over any useful listening area.

brucek

[kengrayfield]

I am going to use software convolver with the filter IR (PC as source). I wonder if that is appropriate. And yes, I am using no subwoofer. So these are measurements of my main. I guess my question is really about what does the big dips tell about my room accoustic or speaker placement, whether it can be remedied with EQing or not.

[brucek]

I wonder if that is appropriate. And yes, I am using no subwoofer. So these are measurements of my main.

Well, as I said in my initial post, outside the low frequency subwoofer frequency range, equalization is quite ineffective in creating suitable results beyond a very small listening sweet spot (as a result of shorter wavelengths). The EQ at higher than subwoofer frequencies is really only valid at the point where the response was measured and a small region around that point (don't move your head). So, I don't see how the convolver would be of any use for a set of mains.

Measure at different locations, and the dips and peaks for the mains frequencies, and the result will be completely different.

brucek

[Wayne A. Pflughaupt]

kengrayfield wrote:

I am going to use software convolver with the filter IR (PC as source). I wonder if that is appropriate. And yes, I am using no subwoofer. So these are measurements of my main.

I don’t have any qualms about equalizing the mains, but then I know what I’m doing. If you don’t, proceed with caution.

That said, I’m not sure how “appropriate” or a PC-based EQ is useful in a home theater. I gather you’d be using the PC’s DVD drive and a 5-1 soundcard fed directly to amplifiers or powered speakers?

I guess my question is really about what does the big dips tell about my room accoustic or speaker placement, whether it can be remedied with EQing or not.

Moving speakers can definitely make a difference in the range your graphs show, so by all means try that first, if it’s an option. In the range your graph shows (below 400 Hz) the room is a big influence, just as it is in the subwoofer range, so EQ can make a difference, just as it does with a sub – if you can recognize what’s “addressable” and what’s best left alone. Typically with the mains you only want to address broader “trends,” with broad fitlering, rather than narrow problems that require narrow filtering. Like your 100 Hz dip vs. the one between 200-300 Hz, for instance.

Regards,
Wayne

[kengrayfield]

Thanks for all the replies. My speakers are actually rated with FR from 45hz to 22khz. And stupid me, I have adjusted the curve with full-range speaker option the whole time. After choosing "bass limited" option with cutoff at 40hz, there are actually at least four peaks found below 50hz range. Hope this means that the IR will be helpful in my case. Also, I am only using this for my stereo setup, fed from my PC through toslink to an external DAC.