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SIR1 has an average user rating of 4.25 from 4 reviews

Rate & Review SIR1

User Reviews by KVR Members for SIR1


Reviewed By jopy [all]
January 5th, 2006
Version reviewed: 1.011 on Windows

For starters, it's worth considering what a convolution reverb is (and my review was too short, so I need to pad it a little). Convolution reverbs use impulses usually collected from natural spaces by people popping balloons or using other meants to get a basic example of how the space affects sounds. Then the reverb unit emulates the behavior of the natural space by filtering/damping the sound consistent with the response pattern of the reverberation of the natural space. Convolution reverb is the next step in reverb for those interested in rich, natural sounds.

In my opinion, SIR is the undisputed king of free reverb effects, and I've tried quite a few. There's nothing else in the same class as SIR. The sound is gorgeous, natural, and very morphable in a hurry. One can find dozens of free impulses online to enhance choices. Because most commercial convolution reverbs are quite expensive, this free version is all the more impressive. I've had minor stability issues and it doesn't work for live recording because it has too much latency, so it's not perfect, but it is outstanding for a free product.
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Comments & Discussion for SIR Audio Tools SIR1

Discussion: Active
9 February 2017 at 11:00pm

Now, this may well be just me not being very knowable, but - how is "fixed latency" a feature? To me, it seems like a bug.

26 April 2017 at 2:47am

This appears to be no longer available. The link redirects to siraudiotools' products page, where you can buy SIR2. There is no entry for (free) SIR1.

@Thohi It's too slow to calculate convolution without latency. The only way to do it without latency is fully in the time domain, where each sample of output requires /n/ multiply-and-add operations (/n/ being the size of the convolution kernel). It's actually faster to FFT the input, multiply by the IR spectrum, and IFFT to get the output... but you have to collect an entire FFT frame's worth of audio before you can do that, hence the latency.

26 April 2017 at 6:33am

The link is now hidden... but remains available. It is this one:



26 April 2017 at 3:26pm

How then do the other IR reverb plugins do it with little to no latency?

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