Error in Help ?

**sonata31** · **11-07-06, 09:17 AM**

In Help , page Filter Adjustment :

The optimiser limits its range of Q/bandwidth adjustment so that filters do not get narrower than 3Hz bandwidth or broader than 15Hz and Q does not get lower than 3.0. This is because it is targeting room resonances, which occupy that range of bandwidths. For broader or narrower filters make manual adjustments.

15Hz ??

**brucek** · **11-07-06, 09:50 AM**

Quote:

15Hz ??

This is filter width....

brucek

**sonata31** · **11-07-06, 12:40 PM**

Quote:

brucek wrote:

This is filter width....

brucek

Yes I Know

Why 15Hz ? It is not much !

**brucek** · **11-07-06, 02:00 PM**

Quote:

Why 15Hz ? It is not much !

I don't think so. That's the filter bandwidth at the half gain points.

Certainly as you go lower in frequency, it makes for a larger filter. This is simply the maximum that REW calculates. You can go wider manually though.

Here's a ~15Hz filter width at 30Hz and at 100Hz.

Name: 30hz.jpg
Views: 38
Size: 33.1 KB

brucek

**JohnM** · **11-07-06, 07:27 PM**

Quote:

sonata31 wrote:

Yes I Know

Why 15Hz ? It is not much !

Because modal resonances are narrower than that.

**sonata31** · **11-08-06, 04:43 AM**

Ok, Thank You for your responses

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