Koch LB 120-II, LOADBOX LB 120-II Operating Instructions Manual

LB120-II

Loadbox

OPERATING INSTRUCTIONS

GB

BEDIENUNGSANLEITUNG

DE

GEBRUIKSAANWIJZING

NL

 2003 Koch Guitar Electronics

EC DECLARATION OF CONFORMITY

We, Koch Guitar Electronics, Neonweg 27, 3812 RG Amersfoort, The Netherlands, declare
under our sole responsibility that the product:

LB120-II Load Box

to which this declaration relates is in conformity with the following harmonized standards:

* EN 50081-1 (1991) Electromagnetic compatibility. Generic emission standard.

Part 1 : residential, commercial and light industry;

* EN 50082-1 (1991) Electromagnetic compatibility. General immunity standard.
Part 1 : residential, domestic and light industrial environment;

* EN 60065-1 (1993) Household electronic apparatus.
Part 7 : Heating under normal operating conditions;

* EN 60335-1 (1988) Safety of household and similar electrical appliances.
Part 1 : general requirements.

following the provisions of Council Directive 98/336/EEC on the approximation of the laws
of the Member States relating to electromagnetic compatibility and the provisions of
Council Directive 73/23/EEC on the approximation of the laws of the Member States
relating to low voltage and electrical safety.

Amersfoort, 1 july 2003

Dolf Koch

Gnd

Lift

Guitar Amp’s

Speaker output

100% Z40%15%5%2%1%

Combo Speaker or Single Speaker Cabinet

Balanced

DI Output

Voicing

Output

Volume

Line

Output

-10dBV 0dBV

To Two

Speaker Cabinets

Total Load = Z

From

Attenuator

W

W

Recording / PA Direct Out Multiple Cabinets

Phones 120 Watts RMS Power Attenuator / Dummy Load

LB120-II Load Box

6-12Vdc / 0.25A

+

-

Fan Power Supply

1

8

12

91011

2345 6 7

E N G L I S H

Thank you for choosing our LOADBOX. The LB120-II LOADBOX has been designed to enable you to use your
guitar amplifier's full-power-sound at low volumes and/or to input that sound, exactly the way it is, into a PA or
Recording mixing console. The LB120-II has been designed and built by people who - from their own experience
as musicians - take guitar sound and quality very seriously.
The LB120-II LOADBOX was built with the utmost care in order to meet all professional standards and to never let
you down, wether you use it at home, in the studio or on-the-road.

Please take your time to read this manual carefully before you start using the LB120-II LOADBOX and also please
fill in the warranty card and mail it. Thanks again and lots of succes with your new LOADBOX !

CAUTION:
* BEFORE PUTTING INTO OPERATION READ THESE OPERATING INSTRUCTIONS

CAREFULLY.
* NO USER SERVICEABLE PARTS INSIDE.
* REFER SERVICING TO QUALIFIED SERVICE PERSONNEL ONLY.
* TO REDUCE THE RISKS OF ELECTRICAL SHOCK, DO NOT REMOVE THE

COVER.
* TO REDUCE THE RISK OF FIRE OR SHOCK HAZARD, DO NOT EXPOSE UNIT TO

RAIN OR MOISTURE.

WARNING:
DURING OPERATION THE LB120-II GETS HOT. YOU MUST:
* NOT OBSTRUCT THE VENTILATION OPENINGS.
* NOT OPERATE THE UNIT NEAR SOURCES OF EXCESSIVE HEAT OR INSIDE A

CLOSED CABINET OR 19" RACK HOUSING, WITHOUT ACTIVATING THE INTERNAL

FAN COOLING.
* NOT TOUCH THE INTERNAL POWER RESISTORS DURING OPERATION, THESE

GET VERY HOT!

LB120-II PANEL FUNCTIONS

[1] LIFT/GND SWITCH : Connects or disconnects pin 1 from the XLR connector [2] to ground. Can be used to

eliminate hum caused by a ground-loop.

[2] DI OUTPUT : This XLR connector provides a 600 ohms fully balanced direct output for recording or PA. The
filtered output signal [4&5] is at microphone level, -14dB lower than the signal level at the 'Line' output [3].

[3] LINE OUTPUT : This jack connector provides an unbalanced direct output for recording or PA. The filtered
output signal [4&5] is at line level (-10 to 0 dBV).

[4&5] VOICING SELECTORS : These selectors change the slope of the filters inside the LB120-II, that simulate
the typical recording characteristic of a microphone placed in front of a guitar speaker.
[4] This switch provides selection between the placing of a microphone pointed straigth to the centre of the speaker
(axis) or pointed more to the edge (off-axis) wich results in less bright sound very suitable for recording of distortion
sounds.
[5] This selector selects simulation of the typical characteristics of either a 1x12 or a 4x12 speaker cabinet. The
4x12 position offers higher low-end pressure and more low-mids.

[6] DIRECT OUTPUTS : These jack connectors provide an unfiltered and unbalanced line output of the signal.
They can be used to input the signal from the speaker output of your guitar amplifier, via the LB120-II, into a
second guitar amplifier.
Two signal levels are available: -10dBV, for FX loop returns and other low level inputs; 0 dBV, for power amps and
other high level inputs.

[7] MULTIPLE CABINETS : These jacks make it possible to connect two speaker cabinets to the LB120-II.
You must first connect the "From Attenuator" jack to one of the Attenuator 1%-100% output jacks [10], with a short
jack-jack speaker cable. Now the two "To Two Speaker Cabinets" output jacks can be used to connect two
speaker cabinets to the LB120-II [10 'impedance'].