Table of Contents
Advertisement
-12dB in the channel's meter. For each channel,
activate the test noise and correct the channel
volume using the corresponding slider (D) so
that the meter reads approximately -12dB.
Note that all channels are automatically listed
and subwoofers are automatically identified.
Remember that it is important that multi-way
speakers and subwoofers have already been
individually aligned and grouped therefore will
appear as one loudspeaker. Click Proceed (E).
11.
Measure Acoustic Response of
Sweet Spot
Place the microphone in the exact sweet spot
of the room at ear level to begin. It must be in
the left-to-right center of the room since it will
be used for loudspeaker distance and level
calculations. Select the type of listening area
you wish to define. Chair is for a single listening
position, Sofa is a somewhat wider range of
listening positions, and Auditorium is the widest.
Start the measurement by pressing the START
button. The measurement waveform graphic is
updated in real time.
12.
Measure Acoustic Response of
Remaining Positions
Once the first measurement is taken, that
position will turn green indicating successful
capture. Move the microphone to the next
position indicated in the diagram. Use the View
Menu to rotate the diagram to clearly identify
the next position. Repeat measurements for all
SP4 Immersive Surround Processor
listening positions. With each measurement,
the waveform graphic will update. Click Proceed
when done with all 9 measurements.
13.
Target Curve
Once all measurements are complete, you
can visualize measurements of each speaker.
You can customize the target curve for
each speaker by (A) limiting the correction
window and (B) dragging anchor points
on the target curve to desired locations.
A
B
C
Clicking Auto Target (C) will generate a good
target response curve that respects the
bandwidth of the speaker and does not try to
apply too much gain to areas of low output.
Good target curve design is beyond the scope of
this document, but there are some key points to
remember.
•
Do not attempt to boost bass of a loudspeaker below
its low frequency limit as this will only lead to high
distortion and likely damage
•
High quality speakers usually benefit from limiting
the correction window to low frequencies.
•
Ideal curves usually have a slightly downward slope.
A loudspeaker may have a flat amplitude response on
axis, but will rarely be flat off axis.
•
Aim for identical target curves between channel pairs
(such as Front Left and Front Right) to obtain the best
spatial imaging.
Save the Target Curve (D) for use in another
channel or for other future use. Repeat for all
channels.
D
25
Advertisement
Table of Contents
