Harley Benton HB 3000 BT, User Manual

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3. Installation
Mains voltage
Please ensure that your local area’s mains power voltage matches
the mains power specification of your amp as indicated on its rear
panel before you connect the unit to an AC mains power outlet!
Mains connection
Use the enclosed power cable to connect the unit’s MAINS IN to a properly
wired and earthed (!) IEC power socket. The cable meets all of the international
safety certification requirements.
Speaker connection
Use the SPEAKER OUT sockets to connect external speaker cabinets. HB 115B
MK III allows to switch on/off the built-in horn using the HORN OFF switch.
Caution:
Before you connect an external speaker to HB 115B MK III you must
disconnect the internal speaker. Otherwise the overall impedance will drop
below 4 ohms and the amplifier will be damaged!
NEVER connect an external speaker or a mono plug to the output jack for the
internal speakers as this output uses a special pin assignment (tip = horn, ring
= woofer sleeve = ground)!
Audio connections
The set is equipped with mono phone jacks, except for the headphones output
which is a stereo jack (TRS).
Here you see some useful wiring schematics for the most usual connector
types:
1/4″ stereo TRS jack plug unbalanced use of mono 1/4″ plug.