Are Dynacabs static/linear?

D

duriehill

Member
Dynacabs are great and flexible, I wondered if once a set up is chosen, is this equivalent to a static IR?

As in, are there any programme dependent non linearities going on with Dynacabs?

AI searching gives me some interesting results lol
 
Thanks, I thought this was the case however an AI assured me that dyncabs are superior in terms of quality over static IRs as there is an element of non linearities in cabinet thump, resonance etc.
 
What in the world is a “dynamic” IR supposed to be?

The cab block has saturation and compression, so it’s not linear, and probably can be qualified “dynamic”. But it has nothing to do with IRs or dynacabs.
 
vangrieg said:
What in the world is a “dynamic” IR supposed to be?

The cab block has saturation and compression, so it’s not linear, and probably can be qualified “dynamic”. But it has nothing to do with IRs or dynacabs.
Click to expand...
It’s linear by default until the user forces it into distortion of some sort.
 
  • Like
Reactions: Rex
vangrieg said:
Sure, but where these questions come from, linear & static = bad, so I’m just saying that the block isn’t just an IR.
Click to expand...
For people who don't understand the issues, the Wiki has good information about how Cab blocks behave by default and what parameters in them can cause them to act differently. It's worth reading Cliff's comments.

In general, by default, a Cab block can sit anywhere after the Amp block and before the particular Out block where you want it to be heard. If the Amp block is running clean, not adding distortion (but what fun is that?), it's probably OK to run the Cab block before the Amp block but that messes with my mind so I stick with it after.

Here are some of Cliff comments:
The difference in having the cabinet before or after the effects is usually subtle. It depends on how non-linear or time-variant the effect is. For effects like EQ, which are linear and time-invariant, it doesn't matter at all. For slightly time-variant effects like chorus and flanger the difference isn't very pronounced. For highly time-variant effects, like pitch shifting, the difference can be marked.
Click to expand...
[6] Linear means that the output is related to the input by a straight line: y = mx + b. Filters are example of linear systems. A cabinet IR is a filter. Distortion is an example of a nonlinear system.

Linear systems are associative and commutative. Associative means that a * (b * c) = (a * b) * c.

Commutative means that a + b = b + a or a * b = b * a. Therefore you can do cab -> eq (a * b) or eq -> cab (b * a).

The cab block is not "completely" linear if motor drive is non-zero but it is "wide sense stationary" so you can treat it as linear.
Click to expand...
 
vangrieg said:
But the amp block isn’t “linear time-invariant”, so it matters whether something is before or after it, including the cab block.
Click to expand...
True. The difference between putting the cab in front of the amp and after it is the same as the difference between pre-EQ and post-EQ.
 
You must log in or register to reply here.
Back
Top Bottom