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Some months Cliff talked about decreasing the length of IRs to avoid reflections. See quote at the bottom.
An nice side-effect of decreasing IR length is that CPU usage decreases.
In a preset with a two Hi-Res IRs, decreasing the length of both IRs from "MAX" to 512 samples, decreases CPU with 8%.
When using two UltraRes IRs, the savings are a little less, but still 5% or so.
And no loss of quality whatsoever, at least to my ears.
The "IR Length" parameter is currently available only on the Axe-Fx III.
"I've been experimenting with IR length lately and keep finding that I like a shorter length. So I gave some thought to it and I think the reason is that a shorter IR trims off the early reflections. A 1024 sample IR is over 20 ms. If there is a wall 5 ft. away that puts a reflection smack dab in the middle of the IR. The Redwirez IRs you can see (and hear) the ceiling reflection pretty clearly (ceiling was probably about 8 ft). Using a shorter IR removes that reflection. I've actually been turning down the IR length lately on my personal patches, typically 512 samples, as I find it makes the IR "clearer". While the push in the industry has been towards longer and longer IRs I'm not sure that's a good thing unless you are careful with your IR capture to ensure that you aren't capturing reflections. Some IRs, particularly ported bass speakers, may need the longer length to capture the low end with sufficient detail but the average guitar cab is probably fine at 512 or even less samples. Heck, prior to the original Axe-Fx some products were even using 128 samples"
An nice side-effect of decreasing IR length is that CPU usage decreases.
In a preset with a two Hi-Res IRs, decreasing the length of both IRs from "MAX" to 512 samples, decreases CPU with 8%.
When using two UltraRes IRs, the savings are a little less, but still 5% or so.
And no loss of quality whatsoever, at least to my ears.
The "IR Length" parameter is currently available only on the Axe-Fx III.
"I've been experimenting with IR length lately and keep finding that I like a shorter length. So I gave some thought to it and I think the reason is that a shorter IR trims off the early reflections. A 1024 sample IR is over 20 ms. If there is a wall 5 ft. away that puts a reflection smack dab in the middle of the IR. The Redwirez IRs you can see (and hear) the ceiling reflection pretty clearly (ceiling was probably about 8 ft). Using a shorter IR removes that reflection. I've actually been turning down the IR length lately on my personal patches, typically 512 samples, as I find it makes the IR "clearer". While the push in the industry has been towards longer and longer IRs I'm not sure that's a good thing unless you are careful with your IR capture to ensure that you aren't capturing reflections. Some IRs, particularly ported bass speakers, may need the longer length to capture the low end with sufficient detail but the average guitar cab is probably fine at 512 or even less samples. Heck, prior to the original Axe-Fx some products were even using 128 samples"