ENGLISH OPERATION MANUAL
JB SYSTEMS®4/25 PPA-121
advice to keep it at maximum and use the rotary knob (10) to change the volume.
9. IR-RECEIVER: receives IR-signals from the remote control.
Important note for numbers 10+11+12+13: To prevent damage to the speakers of your speaker cabinet,
please set all input levels always to zero before you switch the device on or connect a microphone / audio
source. After this you can turn the level up to the desired level.
10. RADIO/MP3-PLAYER VOLUME: used to adjust the volume of the internal player.
11. MIC 1 INPUT + VOLUME: This input accepts both balanced and unbalanced microphones. You can
use both ¼”jack and male 3pin-XLR connectors. First always set the volume knob to zero, after that
turn it slowly up to the desired level.
12. MIC 2 INPUT + VOLUME: same functionality as MIC 1, see: (11).
13. LINE INPUT + VOLUME: This input accepts both balanced (3pin-XLR) and unbalanced (RCA, cinch)
line level audio signals like for example: CD-player, tuner, MP3-player, ... First always set the volume
knob to zero, after that turn it slowly up to the desired level.
14. TONE CONTROLS: Used to adjust the treble and bass of the master signal.
15. LINE OUTPUT: This balanced output (3pin-XLR) makes it possible to connect several speaker cabinets
together, the line output is NOT influenced by the settings of the tone controls (14).
16. CLIP LED: is lit when the amplifier is clipping (close to distortion). You are working on the limits of the
amplifier, please turn the volume a little down.
17. POWER LED: indicates that the amplifier is switched on.
18. POWER SWITCH: Used to switch the internal amplifier on/off. The Power led (17) is lit while the
cabinet is switched on.
19. MAINS INPUT: Mains input with IEC socket and integrated fuse holder, connect the supplied mains
cable here.
20. VOLTAGE SELECTOR: used to select the mains input voltage, 115Vac or 230Vac. Check this switch
BEFORE you connect the unit to the mains.
RIGGING
Important: The installation must be carried out by qualified service personal only. Improper
installation can result in serious injuries and/or damage to property. Overhead rigging requires
extensive experience! Working load limits should be respected, certified installation materials
should be used, the installed device should be inspected regularly for safety.
Make sure the area below the installation place is free from unwanted persons during rigging, de-rigging
and servicing.
The cabinet should be installed out of reach of people and outside areas where persons may walk by or
be seated.
Before rigging make sure that the installation area can hold a minimum point load of 10times the
cabinet’s weight.
Always use a certified safety cable that can hold 12 times the weight of the cabinet while installing the
unit. This secondary safety attachment should be installed in a way that no part of the installation can
drop more than 20cm if the main attachment fails.
The cabinet should be well fixed; a free-swinging mounting is dangerous and may not be considered!
The operator has to make sure that the safety-relating and machine-technical installations are approved
by an expert before using them for the first time. The installations should be inspected every year by a
skilled person to be sure that safety is still optimal.
The cabinet has 4 rigging points using M8 inserts. These can be used to
suspend (fly) the cabinet in the air. For this purpose you can use heavy duty
eyebolts with metric M8 thread. In most cases 2 cables will be attached to the
top and one is used to pull up the back.
Anyway always take special care when the cabinets are suspended. This is
potentially dangerous and should only be carried out by technicians who have
perfect knowledge of the techniques and regulations of rigging speakers!
