85
SPL CALIBRATION AND READOUT
The Realiser can be calibrated to display volume level in dB SPL. The calibration is saved to an
HPEQ file, which can in turn be saved to a preset. In this example, the Realiser noise generator will be
used, but an external noise generator could also be used..
Load the HPEQ file you would like to calibrate into memory location 64, and also load it into a preset
together with a PRIR. Select that preset. Turn on the noise generator by pressing
MODE
until
nSOLO
or
nMUTE
appears. Press
PASS
to set the Realiser into bypass mode. Choose a single speaker such as
L
using the virtual speaker keys. Measure the SPL of that speaker at the listening sweet spot.
Set the Stax amplifier volume to a medium position which will always be used for calibrated listening,
and make a note of the knob position. In
MENU-SVS
, set
DEMO
to
TILT
.
Now compare the noise level in the speaker with the noise level in the headphones using the tilt
function. Adjust the headphone volume using the ^ and
v
keys until the speaker and headphone noise
levels are the same.
Press
REF
. The screen will say:
ENTER MEASURED SPL
> 73dB
PRESS ! TO ATTACH
...CANCEL TO EXIT
Enter the measured SPL number, and press
(!)
. The HPEQ in location 64 is now modified and
shows the letter “
c
” (calibrated) in its ID screen. Save this HPEQ to another memory location. Load
the calibrated HPEQ into a preset with a PRIR. The volume readout using the ^ and
v
keys now shows
values in dB SPL. 85 dB is the maximum that can be set. (Additional volume can be gotten at the
Stax volume control, but if the Stax control is moved from the calibrated position the readout will no
longer be calibrated.)
If desired, you can run the noise generator again, measure the level in one speaker, and verify that the
headphone level for that speaker is the same when the headphone volume has been set to the measured
level.
