APS SUB 10 User Manual download pdf (Page 5)

When sending signals to both R and L inputs, the subwoofer plays the sound at a level higher by 6dB, which results

from the operation of aggregation.

Switches

The subwoofer's rear panel features switches used to find the optimal settings of the device in order to work in a

variety of acoustic and electric conditions. Each of the switches is described below.

7. PHASE switch

The phase switch is used to match the subwoofer phase to the phase of monitor speakers.

If the distance of the listener to the subwoofer is the same or slightly less than the distance to the monitor speakers,

set the PHASE switch in the down position, i.e. at 0 degrees. This situation occurs, for example, when the monitor is

placed directly on the subwoofer in a system with two subwoofers.

And when this distance is greater by about 1 - 2 metres, then set the switch in the up position, i.e. at 180 degrees. A

situation may occur when, for example, a single subwoofer is positioned on the floor about 0.5 - 1.5 metres behind the

monitors.

It is a good idea to test the position of the subwoofer in the listening room and of the PHASE converter, because the

final sound is heavily dependent on the vibration modes of the room at low frequencies. In addition, monitor speakers

or other devices in the electroacoustic path can reverse the phase.

8. UNFILTERED switch

The switch turns off correction, i.e. the subwoofer filters responsible for its sound.

When the UNFILTERED (LFE) switch is set in the down position, the appropriate correction is enabled and the CUT

OFF controller is active. In the up position, the correction is disabled and the CUT OFF controller is inactive.

In most cases the UNFILTERED (LFE) switch is in the down position, with the filters enabled.

If the tone of the sub-bass channel is imposed by an external device, e.g. when an LFE channel (Low-Frequency

Effects) is the source, you can turn off the subwoofer correction. However, it is a good idea to test both settings.

9. CUT OFF switch

The CUT OFF switch is an eight-position controller for the upper cut-off frequency of the SUB 10 subwoofer. It

allows you to adjust the crossover frequency between the subwoofer and the monitors, depending on the monitors'

ability to play low frequencies.

It is the best to start the adjustment with the smallest values, reasonably increasing the CUT OFF value while

controlling the subwoofer volume using the VOLUME switch. Make sure that the PHASE switch is set in the desired

position.

11. VOLUME switch

Fine-tuning the sensitivity of the SUB 10 subwoofer, or simply its volume, is possible using the eight-position

VOLUME switch.

The subwoofer is equipped with a switch instead of a potentiometer. This allows for, among other things, repeatable

and reliable adjustment of the subwoofer sensitivity to the sensitivity of monitor speakers, or for repeating the same

settings in subsequent subwoofers in the system, or restoring the settings used in the past.

The switching interval is 1.5dB. This switch cooperates with the three-position VOLUME switch. The resulting value of

attenuation or gain in decibels is the sum of values indicated by the positions of both switches.

12. Three-position VOLUME switch

The three-position VOLUME switch allows for adjusting the sensitivity/volume of the subwoofer in a wide range.

The switching interval is 10dB. This switch works with the eight-position VOLUME switch. The total adjustment range

of the two switches is 30.5dB.

13. STAND-BY switch

The STAND-BY switch allows for saving energy when the subwoofer is not used in a continuous manner.

With the switch in the down position, the STAND-BY system is active, and the subwoofer turns off after a certain time

in the absence of a sound signal, and turns on when the signal appears at the input.

SUB 10 can be used with a variety of signal sources. The switches make it possible to precisely and evenly adjust

the levels in each of the subwoofers in both a stereophonic and multichannel system.

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APS SUB 10 User Manual Page 5

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