shatteredsquare
Power User
how did yall measure senior Cliff's infamous halfback?? That's two separate cabs in one
No.I read the description and I downloaded it but I'm just not understanding what this does. Does it only effect with cab sims on?
I'm working on a idea to use the outputs of the Axe-Fx directly along with a special cable to allow field measurements by users.
Does this mean the cabinet resonance should be known for every IR used and set accordingly in the Amp Block for best results? I don’t know the resonance of the cabs captured in almost all the IRs I use.No.
A tube power amp is a transconductance amplifier, voltage in - current out. A speaker is a voltage transducer, voltage in - sound out. Since the power amp is driving current the voltage at the speaker is the current times the impedance of the speaker (Ohms law V = I*R). The voltage therefore is dependent upon the impedance.
A solid-state power amp is a voltage amplifier, voltage in - voltage out. Since the power amp is driving voltage the voltage at the speaker is NOT dependent on the impedance of the speaker.
When an IR is captured (correctly) it is done using a solid-state power amplifier so the effects of impedance do not influence the measurement. Some people try to use tube power amps to capture IRs. This is incorrect methodology.
The Axe-Fx power amp simulation is a transconductance simulation. It uses a simulated speaker impedance to derive the output voltage that then drives the simulated cabinet (IR).
Firmware 11.xx has 47 (and counting) speaker impedance curves that you can select that allow for different power amp transconductance responses. Moreover the impedance simulation is now a high-order network that simulates the perturbations in impedance due to cabinet resonance.
If you are using a conventional guitar cab and solid-state power amp ideally you would want to know the impedance curve of the cabinet. This requires special test equipment although I'm working on a idea to use the outputs of the Axe-Fx directly along with a special cable to allow field measurements by users. At this time the impedance curve matching is a Matlab program though and requires some hand-tuning.
Does this mean the cabinet resonance should be known for every IR used and set accordingly in the Amp Block for best results? I don’t know the resonance of the cabs captured in almost all the IRs I use.
Ideally. Obviously that's not practical. So choose an impedance curve that most closely matches the speaker you used.Does this mean the cabinet resonance should be known for every IR used and set accordingly in the Amp Block for best results? I don’t know the resonance of the cabs captured in almost all the IRs I use.
What do you mean by "DEFAULT"? There is no DEFAULT cabinet type.Great feature. Improved some patches within minutes. But when I select one of the cabinets and switch back to DEFAULT I get the linear default and not the initial curve.
This would be freakin-fuckin-tastic!I'm working on a idea to use the outputs of the Axe-Fx directly along with a special cable to allow field measurements by users
I mean the Null Cabinet. On the speaker tab I don‘t get the initial curve anymore.What do you mean by "DEFAULT"? There is no DEFAULT cabinet type.
That's because it's a Null Cabinet. It doesn't have any resonances.I mean the Null Cabinet. On the speaker tab I don‘t get the initial curve anymore.
Those three are placeholders as we don't have actual cabs to measure but we will have access to some soon.While scrolling thru the cabinets I noticed there are some which are not affected by the cabinet resonance parameter, is this normal?
They're:
2x10 Bassguy
4x10 Brit JM45
4x12 Hipower
Good to knowThose three are placeholders as we don't have actual cabs to measure but we will have access to some soon.