3
Measurement:
Fig 1: the above figure shows the on-axis measurements of preset-1, as can be viewed the low end is
extended rolling off nicely to a -12dB point at around 20Hz. The dotted red line shows the system
with the midrange inverted, displaying deep notches around each crossover point which indicates
good phase coherence between the drivers. 1/12
th
Octave smoothing.
Fig 2: This figure shows the off-axis response of preset-1 in 15 degree increments, effort has been
made in the EQ stage and with the crossover tuning to try and make sure that the off-axis effects of
the coaxial loading are minimised, this can be seen by the minimal crossing of the data series in this
graph.
As can be seen in the figure somewhere around 15 degrees gives the smoothest response,
this can be considered when placing the speakers in room.
Frequency [Hz]
100
1 000
10 000
S
P
L
[
d
B
]
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
KingRO4Y - Inverted Midrange
L26RO4Y
C18C18N002/A - Midrange
C18N002/A - Tweeter
KingRO4Y
Frequency [Hz]
1 000
10 000
S
P
L
[
d
B
]
8
6
4
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
KingRO4Y - 60 - Fundamental
KingRO4Y - 45 - Fundamental
KingRO4Y - 30 - Fundamental
KingRO4Y - 15 - Fundamental
KingRO4Y - 00 - Fundamental
