Further Connections | Hughes & Kettner QC 421, QC 412, QC 415

Quantum -combo Manual

5. Further Connections

5.1 Fx Loop

The FX LOOP is a serial circuit, meaning that effect devices are inserted serially into the signal path. This loop is located post TUBE GROWL knob and pre LINE OUT. In other words, LINE OUT sends a wet or processed signal. Note that you must set the desired dry- to-wet balance on the effect device because in a serial loop like this, the entire signal is patched through the effect device. The FX LOOP is footswitchable (Hughes & Kettner® FS 2).

Send:

Connect this output to the input of your effects device.

Return:

Connect the output of your effects device to this input.

5.2 Line Out:

The wet (or processed) preamp signal is patched out via this un- balanced line output. Located pre Dynavalve™ power amp, it is independent of MASTER knob setting.

Note: Signals sent via this output are not colored by the sound of the Dynavalve™ power amp, so this is the output to use when you want to route the signal to another power amp or an auxiliary rig.

5.3 Di Out:

With the speaker providing the source signal, this direct out sends

abalanced, hum-free and frequency-corrected version of the amp’s output signal to the mixer. Because the circuit is post MASTER knob, its signal is shaped by the reciprocal action of speakers and power amp that are so decisive in determining the Dynavalve™ tube tone.

Note: You may encounter feedback if you are using the DI OUT and the PA’s sound pressure is extreme enough to excite the amp’s speaker (for more on this, see section 7, Troubleshooting).

5.4 Tuner:

Connect a tuner to this output. This jack can also serve as an alter- native output, for example, if you want to tap into the input signal in front of the preamp.

Tip: If you want to mute the amp while you are tuning, turn the MASTER knob down or insert a dummy plug into the RETURN of the FX LOOP without connecting an effector. Because you haven’t actually connected an effect device, you can even mute the amp remotely by activating the FX LOOP via footswitch.

5.5 Headphones:

Connect headphones to this jack. The Quantum™’s speaker output is deactivated when you insert a plug into this jack.

5.6 Footswitch:

When the optional two-way footswitch (Hughes & Kettner® FS-2) is connected to this port, you can switch the FX LOOP as well as PUNCH remotely.

5.7 Speaker Out:

SPEAKER OUT A

This is a serial speaker out, meaning that external speakers are connected serially to the internal speaker(s). The external speakers’ resistance is added to the internal speaker or speakers’ resistance of 4 ohms (8 ohms for the QC 310), so you may connect speakers with low resistance ratings. Although increasing speaker resistance decreases power amp output, the overall level actually increases due to the larger speaker surface area (which also reduces power amp wear).

SPEAKER OUT B

Unlike OUT A, the internal speaker(s) is/are switched off when a plug is inserted into this speaker output. The amp’s full output power of 400 watts at 4 ohms (250 watts at 8 ohms for the QC 310) is routed to this port. This means you can connect external speakers with a total impedance no lower than 4 ohms (8 ohms for the

QC 310) to it.

5.8 Standard Setup / Cable Connections

ENGLISH