Specifications

(6) When to Use the Low-Cut Switch

The Low-Cut Switch is very effective when the APL-220, -500, and -800 are

utilized with subwoofers, or other larger speaker systems.

For example, a system may be made up primarily of FH-4s, 3X3s, or other

large concert type speakers, with APL-500s flown below them for downfill.

Additional APL-500s might be located on the apron of the stage to fill the

front rows where direct coverage by the larger speakers is absent. More APL-

500s might be located towards the rear of the venue as "delay fills." In all

three cases, using the Low-Cut Switch is recommended. There is probably

enough low-frequency energy already present in the venue from the larger

speakers and subwoofers, so reducing the low-frequency output of the APL-

500 fill speakers should improve the overall sound quality as well as allow the

APL-500s to be operated safely at higher levels.

(7) Care in Using the Low-Cut Switch

Because the action of the Low-cut Switch cannot easily be reversed without

direct access to the switch itself, it is important to make sure the switch is

in the desired position before the speaker system is flown (or otherwise

placed in a location where it is difficult to access).

The Low-Cut Switch significantly reduces the amount of low-frequency ener-

gy the speaker system will reproduce and, thus, should not be used indis-

criminately.

NOTE: If an APL-220, -500, or -800 is installed in a difficult-to-access location

and it’s determined that the switch position is opposite to that which is

desired, it’s possible to employ an equalizer to compensate for either switch

position: Flat or Low-Cut.To emulate the Low-Cut mode of the switch, you

will need a precision outboard equalizer equipped with a 100 Hz, 12

dB/octave high-pass filter. Undoing the effect of the Low-Cut Switch is a bit

harder.The equalizer will need to be able to produce the inverted response

of a 100 Hz, 12 dB/octave low-pass filter, something that is not usually obtain-

able from most equalizers.

You will also need enough time to set the equalizer properly, and however

good the equalizer might be, it will contribute additional noise and signal

degradation to the system’s response.Therefore, it is strongly recommended

that the Low-Cut Switch be positioned to best advantage for the particular

application before the loudspeaker is flown or located in an area that is dif-

ficult-to-access.