Roar Quad 15, Руководство пользователя

Страница: 5 / 28

5
4. C
ONNECTIONS
– A
UDIO
& MIDI
This chapter describes all audio & MIDI connections to the Quad15. Use screened jack cables of good quality for audio
connections except for the speaker output, where a dedicated speaker cable is recommended.
4.1 I
NPUT
-
FRONT
Plug in your guitar with a standard mono jack cable in the front panel input. When
you turn on the power of the Quad15, the “Front” input will be selected by default
and the signal will be fed to the preamp as typical in other amplifiers.
Input impedance ~ 1 Mohm. Programmable pickup-switch: Connecting your guitar using a
stereo jack-cable, you can switch between two pickup-signals from your guitar with the “Input
– Front/Rear” selector on the front panel. This feature requires a special pickup configuration
of your guitar, which is described in further details in section 9, page 21. Notice, that you can’t
use the rear input when using a stereo cable for pickup-switch, since it would overrule the
“front input”.
4.2 I
NPUT
– R
EAR
Plug in a wireless system, effect pedal, guitar with active pickups, sound card output, keyboard,
etc. To activate this input, simply push down the “Input” switch to select “Rear” (Red LED) and
the rear input will be routed to the preamp.
Input impedance ~ 22 kohm. It is not possible to connect both front and rear input to the preamp at the
same time. It is safe to plug in a guitar with passive outputs, but the signal will be attenuated.
4.3 G
UITAR
O
UT X
2
The signal from “Input – Front” is buffered and routed to the “GUITAR OUT” x 2 jacks on the
rear panel. Connect to tuners, recording devices, effect pedals, etc.
These outputs are designed to provide low output impedance with very low noise and distortion for an
uncolored pickup sound ideal for recording and re-amping, etc. This is achieved by a high quality
operational amplifier, which is the only “non-tube” circuitry in the signal chain.
4.4 P
RE
-
GAIN LOOP
(G
UITAR
O
UT
- > I
NPUT
R
EAR
)
Before the input signal hits any of the four preamp channels, you can insert an effect pedal, etc. in the pre-gain loop:
Lower “GUITAR OUT” -> Input (effect pedal)
Output (effect pedal) -> “INPUT REAR”
The lower “GUITAR OUT” jack is equipped with a 10 ohm ground loop
breaking resistor to eliminate hum when used for pre-gain loop.
Activate or de-activate the pre-gain loop by pressing
down
the input selector on the front panel.
Front = Pre-gain loop off . Rear = Pre-gain loop on . Now, your favorite overdrive pedal can be
connected and be a part of a fully programmable setup with only the MIDI-foot controller placed
on the floor.
OD/DIST
Pedal:
Boost pedal:
Noise gate:
Combining the character of one of the many OD/DIST pedals available with the tube gain of the
Quad15 you can achieve your own unique distortion character. An OD/DIST pedal is often used as a
tone shaping device with the gain at lower settings using the tone control to control attack and
presence before the signal is distorted further in the preamp. An EQ or treble boost pedal could be
used as well.
Many guitar players prefer to use a boost pedal before the amp for lead sounds. In example, using the
“Overdrive” channel of the Quad15 for both rhythm and lead, you can add a boost pedal in the Pre-
gain loop for you lead sound. ATTENTION! Unwanted feedback might occur if you turn up the overall
gain too high, which appears as a squeezing sound. Turn down the gain or volume on either the
OD/DIST/BOOST pedal or the Quad15.
To mute unwanted noise during pauses, a noise gate can be inserted in the Pre-gain loop. In example,
you can then activate the noise gate for your hi-gain sound by selecting “Rear input” and de-activate
it for your Clean sound by selecting “Front input”. Noise gates can also be connected in the post-gain
effect loop for maximum noise attenuation, see next page.
Effects like delay, chorus, flanger, phaser, pitch shifter, etc. are typically connected after the preamp in the “Post-gain
loop”, see next page, but always feel free to experiment.