Link to House Curve tutorial???

[Darren]

Hi Guys,

I've been searching all morning and can't find a link to a tutorial on applying a house curve.

Can someone point me in the right direction?

Thanks.

[ThomasW]

A house curve is nothing more than flattening the existing response, then creating a curve you like..... = house curve.

If you grab a copy of Room EQ Wizard you can import your existing FR plot by creating a .txt file where the frequency and the dB are separated by a space or comma. Make the list from lowest fequency to highest ....

10,98
12,99.5
16,97
20,100
22,95

etc....

Give this a name and you can then import into REQW.

Without even owning an EQ you can play with various filter combinations to first flatten the response then make your house curve

Note, one is now forced to join the 'Shack' forum to download REQW, so I uploaded the current version to the Megaupload website. The inconvenience of this is that one must close 2 pop-ups and wait 45 seconds before the download starts.

www.megaupload.com/?d=TMSOESQT

One doesn't need to join the forum to get info about REQW or access the help files.
www.hometheatershack.com/roomeq/

[Darren]

Thanks Thomas,

I've been reading up on it and will download the software to play around with.

[Darren]

Well, I'm having some difficulty with the Room EQ Wizard, I can't seem to figure out how to apply the radioshack corrections. It asks if I'd like to apply C weighting corrections but I don't see where I can import the radio shack compensation numbers. I tried to load it as a mic calibration file but it just plots a different line that doesn't appear to go with anything.

I'm confused.

[chrisbee]

There is a difference between C weighting and RS meter calibration.
C weighting is a fixed curve and is supposed to represent normal human hearing sensitivity better than A weighting. Which is normally used to measure industrial noise.

Meter calibration is specific to each meter as it becomes less and less sensitive to low frequencies. Each of the 3 types of RS meter also has it's own typical correction curve. Old analogue, new "soft shape" analogue and the digital.

If you click on "Meter" in REW you can load a .txt file of the meter response correction curve. These curves are available in the downloads section of HT Shack. I believe the Behringer mike is also supported.

I know you have to register for these downloads but you then have direct access to Sonnie, brucek and John (and other forum members of course) via the forum. John is the author of the REW software. All three are very helpful and incredibly patient with enquiries about setting up both REW and the BFD.

REW is a rather steep learning curve unless you are familiar with such software. I certainly wasn't. Even getting the soundcard to the correct settings requires care. REW has it's own helpfiles if you are stuck. As does HT Shack. The great advantage of REW is the incredible speed of test sweeps.

One can make small changes and have a new curve on the screen in seconds. The black line on this graph of my IB + spkrs is the correction curve for the old RS analogue meter. My house curve (blue) which is tilted upwards from 30Hz is rather extreme but goes unnoticed in practice. I'm still playing with my BFD filters.

[Darren]

I was able to load the old analog corrections in but I had to change it to a .cal file and import it. It then presents the black line just like you show but it does nothing to my measured response... how do I apply it? I guess I'm confused. Are those values only applied if you take the measurement through the PC? I can't do that as I'm not set up for it so I assume I have to do it by hand and the calibration file does me no good...right?

Last night I ended up just adding the corrections in by hand and then importing my measurements already corrected. I'd prefer to load the corrections file correctly as it will make things much easier.

So, I suppose in addition to the RS corrections I should apply the C weighting corrections as well?

I'll read more on REW and see if I can become more familiar with the features. Hopefully I'll have it working tonight.