A "house curve" is a target response which differs from that defined by
the bass management settings of the speakers. For a detailed description
see the discussion in the REW forum at www.hometheatershack.com.
Defining a House Curve
The house curve is specified by a set of data that defines an offset
curve that is added to the traces generated from the bass management responses
for the speaker types defined for each channel. The file containing the
house curve data is plain text consisting of pairs of frequency and offset
values separated by spaces, tabs or commas. Interpolation is used
between the pairs of values, either linear (default) or logarithmic,
according to the state of the Use logarithmic interpolation
check box. Logarithmic interpolation draws lines between data points which are
straight if the frequency axis is logarithmic. The first and last values in the file are used for all
frequencies below and above the range of the data respectively.
- Each line of data must have a frequency value (which is in Hz) and
an offset value (which is in dB)
- The points can be at arbitrary frequency spacing, but each
line must have a higher frequency than the one before and there
must be at least 2 freq, offset data pairs
- Only lines which begin with a number are loaded, others
are ignored
- In comma-delimited files there must be at least one space after
the comma
- Spaces before values are ignored
The house curve would typically be used to define a boost for the subwoofer
range, such as that defined by the data points below. These points give
a boost that is 6dB at 20Hz, dropping to 0dB at 80Hz and above. The boost
remains flat at 6dB below 20Hz. A more elaborate curve might include a roll-off
at high frequencies (if full range equalisation were being applied).
House Curve data
20 6.0
80 0.0
When a house curve has been loaded the
symbol is displayed next to the Target trace value in the Filter Adjust graph.