Johan Allard
Power User
17.04
This version adds a new method of capturing User IRs: “Mic + DI” method. The method used to capture IRs is set in the Global menu. Mic Only is the traditional method and uses a single input into Input 2 Left as the response from which the IR is derived. Mic + DI uses both Input 2 Left and Input 2 Right. The mic response (i.e. preamp output) is input into Input 2 Left as usual while the output of a DI box (or DI output on an amp) is input into Input 2 Right. Both responses are captured and the response from the Right input is used to correct the response from the Left input. This accomplishes the same thing as using Reference Compensation in Cab-Lab but is done at capture time rather than during post-processing.
The advantage to the Mic + DI technique is that it allows almost any amp to be used. A flat, solid-state amplifier is not required. Any amp, whether solidstate or tube, with or without integrated preamp can be used. For example a tube guitar head can be used as the “power amp”. You can even plug right into the front of the head (as opposed to using the power amp input or effects return), even if the head is set to heavy distortion. The unique capture technique of the Axe-Fx removes any distortion from the measurement and completely separates the amp response from the speaker response yielding a pure and accurate IR.
To use the Mic/Line + DI method do the following:
1. Connect the line output of your mic preamp to Input 2 Left.
2. Connect a DI box between the amplifier output and speaker input. Be sure
to use a DI box that is specifically designed to work with speaker level
signals and one that does not have any on-board cabinet emulation.
3. Connect the output of the DI box to Input 2 Right.
4. Connect Output 2 Left of the Axe-Fx to the input of the amp.
5. Set the IR Capture Method in the Global menu to Mic + DI.
6. Set the Input 2 Mode in the I/O->Audio menu to Stereo.
7. Capture the IR as usual either using the front panel or Cab-Lab.
Suitable DI boxes include:
Suhr ISO Line Out Box
Pro Co DB1
Whirlwind Director
Whirlwind Direct2
ART ZDirect
Behringer Ultra-DI DI100
Behringer Ultra-G GI100 (with cab emulator off)
Behringer Ultra-DI DI600P
You can also use a speaker attenuator that has a line out. Turn off the attenuation and connect the line out to Input 2 Right.
This version adds a new method of capturing User IRs: “Mic + DI” method. The method used to capture IRs is set in the Global menu. Mic Only is the traditional method and uses a single input into Input 2 Left as the response from which the IR is derived. Mic + DI uses both Input 2 Left and Input 2 Right. The mic response (i.e. preamp output) is input into Input 2 Left as usual while the output of a DI box (or DI output on an amp) is input into Input 2 Right. Both responses are captured and the response from the Right input is used to correct the response from the Left input. This accomplishes the same thing as using Reference Compensation in Cab-Lab but is done at capture time rather than during post-processing.
The advantage to the Mic + DI technique is that it allows almost any amp to be used. A flat, solid-state amplifier is not required. Any amp, whether solidstate or tube, with or without integrated preamp can be used. For example a tube guitar head can be used as the “power amp”. You can even plug right into the front of the head (as opposed to using the power amp input or effects return), even if the head is set to heavy distortion. The unique capture technique of the Axe-Fx removes any distortion from the measurement and completely separates the amp response from the speaker response yielding a pure and accurate IR.
To use the Mic/Line + DI method do the following:
1. Connect the line output of your mic preamp to Input 2 Left.
2. Connect a DI box between the amplifier output and speaker input. Be sure
to use a DI box that is specifically designed to work with speaker level
signals and one that does not have any on-board cabinet emulation.
3. Connect the output of the DI box to Input 2 Right.
4. Connect Output 2 Left of the Axe-Fx to the input of the amp.
5. Set the IR Capture Method in the Global menu to Mic + DI.
6. Set the Input 2 Mode in the I/O->Audio menu to Stereo.
7. Capture the IR as usual either using the front panel or Cab-Lab.
Suitable DI boxes include:
Suhr ISO Line Out Box
Pro Co DB1
Whirlwind Director
Whirlwind Direct2
ART ZDirect
Behringer Ultra-DI DI100
Behringer Ultra-G GI100 (with cab emulator off)
Behringer Ultra-DI DI600P
You can also use a speaker attenuator that has a line out. Turn off the attenuation and connect the line out to Input 2 Right.