• We would like to remind our members that this is a privately owned, run and supported forum. You are here at the invitation and discretion of the owners. As such, rules and standards of conduct will be applied that help keep this forum functioning as the owners desire. These include, but are not limited to, removing content and even access to the forum.

    Please give yourself a refresher on the forum rules you agreed to follow when you signed up.

The Speaker Page

guitarmike

Experienced
Information about what amps (models) use negative feedback and how that affects things like the speaker page parameters would be useful.

How all the settings work together and interact is something I struggle with. I tend to shy away from most advanced parameters because of lack of knowledge of the implications of one parameter in regards to the others.
Me too, and I even have something of a technical understanding of the parameters. Do you think a visualization flow chart/schematic would be helpful? If so any suggestions?
 

barhrecords

Axe-Master
@guitarmike it might be possible to create a pdf where all the amp block controls are on one page.

Then connect the interacting controls together with some directed lines?

Sounds difficult though.
 

FractalAudio

Administrator
Fractal Audio Systems
Moderator
Information about what amps (models) use negative feedback and how that affects things like the speaker page parameters would be useful.

How all the settings work together and interact is something I struggle with. I tend to shy away from most advanced parameters because of lack of knowledge of the implications of one parameter in regards to the others.
Negative feedback does not affect the speaker impedance. Speaker impedance is an independent variable. The default values are based on the speaker cabinet most commonly used with the amp. In the case of a combo it's the internal speaker. For heads it's the mating cabinet, if one.

A typical speaker has a low-frequency resonance with some frequency, Q and magnitude. The Q is typically around 2, frequency around 100 and magnitude around 12 dB. These values are dependent upon the speaker construction and, to a lesser extent, the cabinet.

The voice coil inductance causes the impedance to increase at high frequencies. Unlike a pure inductance which would increase at 6 dB/octave, voice coil inductance is semi-inductive and typically increases at 3-4 dB/octave. The "break" frequency is dependent upon the actual inductance and is adjustable.

The Axe-Fx is unique in that it lets you adjust these values. Most products just use a fixed curve.
 
Last edited:

Rex

Legend!
True. Negative feedback has no effect on speaker impedance. It does, however, affect how the amp reacts to speaker impedance. Less negative feedback equals a stronger reaction to speaker impedance.
 

hippietim

Fractal Fanatic
If I ever find myself contemplating any of these whacky parameters, I know it's time to just pick another IR and move along. LOL
 
Top Bottom