9
to 0dB. Push in the low-cut filter and make sure all of the other buttons in channel 1 are out . Remember only
channel 1 is in use so the settings on the other channels are irrelevant.
Mute the signal to the subs on the LD-1A. Measure and set the delay and response of the speaker. When a
stable trace appears pause the measurement and turn off the generator. Store and recall this trace.
Next, use the LD-1A to mute the signal to the MSL-6 and unmute the PSW-6. Use the delay established with the
MSL-6 measurement. Turn on the generator and measure the response of the PSW-6.
By looking at the relationship between these two traces you can see the acoustical crossover point between the
PSW-6 and the MSL-6.
Changing the relative levels of the PSW-6 and the MSL-6 will effect this acoustical crossover point. Ideally, this
acoustical crossover should occur close to 125 Hz, as this will provide the best frequency and phase addition
between cabinets.
An increase in the relative level of the PSW-6 to the MSL-6 will result in an increase in crossover frequency.
The second example above is undesirable as it will reduce the level of pattern control in the system. In systems
where a boost in low frequency energy is desired , we strongly recommend properly aligning the system so that
the cross over point and level between the MSL-6 and PSW-6 is close to 125 Hz. A CP-10 can then be inserted
into the signal path in front of the LD-1A and adjusted for the desired house curve.
dB SPL
125 Hz
PSW-6 response
MSL-6 response
165 Hz
MSL-6 response
PSW-6 response
Channel 1 of the LD-1A is divided into four sections:
Main Section
(Channel Mute and Master Gain)
DS-2 subsection
(Not used in this application)
Mid-Hi subsection
(Lo Cut Filter, Mid-Hi Mute, Mid
High Gain, and Array EQ Filter
[which is not used in this applica-
tion].) In this application this
subsection is used to control the
level of the MSL-6.
Sub subsection
(Sub Polarity Reversal,
Mute and Sub Gain). In
this application this
subsection is used to
control the level of the
PSW-6.
