Zen and the art of REW - Help!

[benbigdude]

To cut a long story short, I have just purchased a FBQ2496 and I have spent my first evening with it and REW. The results are below...I would really appreciate your feedback....are these any good?

These are sub only...

Graph 1 - No filters


Graph 2 - 9 filters applied


Thank you

[brucek]

Well, you haven't told us a lot about your sub, but when plotting the results it's best to stick with the standard of using a vertical scale of 45dB-105dBSPL and a horizontal axis of 15Hz-200Hz.

I'll also add that there is a nice feature in REW that sorts your filters from low to high. Click the little up/down arrows in REW Filters screen for that.

You've added four filters above 100Hz that are likely not needed. The level from the sub is down considerable above 100Hz and so the when the mains are added, the effect of the filters in the sub at those upper ferquency will not matter. You can likely eliminate them.

You don't show any filters at 25Hz, yet I note the level has been increased at that frequency quite a bit. Can you discuss how much gain you added in your filters. Large gains are somewhat frowned upon.

I don't feel you've eliminated the peak centered at ~35Hz quite enough.

brucek

[Blaser]

Of course, the graph looks better with the equalizer, but I am quite positive you could propably do better with some more tweeking. In the Filter tasks did you follow the sequence:
- Find peaks
- assign filter
- Optimize PK gain & Q?

I think it would be worth trying.

[benbigdude]

Sorry for the axis formating - Believe it or not I read the formating post...must have just got excited!

The sub is a REL Q201e, my processor is a Rotel RSP-1068. I am using the external USB Sound Blaster card and a RadioShack analogue SPL.

The filters I have set are:

Click the little up/down arrows in REW Filters screen

Thank you

- Find peaks
- assign filter
- Optimize PK gain & Q?

Yes - I followed these steps.

[Blaser]

OK...Try one thing: restart from scratch but lower the target setting to be 70 db instead of 75 db. I think you will get a flatter graph.

[Wayne A. Pflughaupt]

Five of your filters are above the subwoofer range and are not needed. Limit the “Find Peaks” option to find peaks only below your crossover point

Not sure I would lower the target curve. It’s just going to cause REW to generate superfluous filters.

Regards,
Wayne

[benbigdude]

Thank you for all the responses....I will try them out over the next few days and report back.