Different sound using same impulse with different loaders.

[Downtuned]

I'm getting quite a noticeable audio difference when using impulses with different loaders.

My main one I use is KeFir but I've been trying to use Lecab2 in order to blend multiples. The problem is when I loaded my first impulse into Lecab2 right away I could tell something was up as the tone was noticeably thinner and much fizzier than when I use the same impulse in KeFir which is very thick and solid.

I can't see any 'mix' or 'wet' knobs in Lecab2 so I'm stumped as to what is up.

Any ideas anyone?

 

[ahjteam]

use the one that sounds better. problem solved.

 

[Downtuned]

Not really, KeFir makes the impulse sound better but doesn't have facilities to load multiple impulses like Lecab2 which doesn't sound as good.

 

[Kohugaly]

LeCab2 cuts the end of the IR if it's too long, because it was designed for short impulses... that can produce some artifacts in high and low frequencies.... I've read it on LePou page...

 

[Downtuned]

Ahh right, thanks for that bit of info. I take it there's no way to adjust the length of the impulse on Lecab2 that I might have missed?

 

[colonel kurtz]

well since an impulse is just a short .wav file, you could manually shorten it a little bit

 

[Kohugaly]

I've just tested it... I loaded different convolvers with 8second sinesweep to find out how long the impulse can be... when I loaded the same sinesweep with FL studio native convolver, the result was how it sould be - delayed all frequencies according to the sine sweep... But in LeCab2 only subharmonic frequencies were boosted. high frequencies were dropping out according to straight line on spectral analizer (that means that the end of the wave is cutout resulting into a click

so LeCab2 deletes the end of the impulses probably longer than a half second or even less... this problem is inevitable, because it's the way the program works. Maybe in version 3 this will be fixed (if there will be any LeCab3). the reason might be, that convolvers are extremely CPU consuming in general. And LeCab are 6 convolvers in one program. So it has limited IR length to prevent overloading the CPU. The programmer thought that user wouldn't use it to load 6 reverb impulses (dozens of second long) anyway.



Then I loaded LeCab2 and FL convolver with the same impulse and tried if they cancel out.... they really didn't (I also tried delay, volume matching and stuff, but failed)... and also the resulting sound was noticeably different using different convolvers... seems like it also affects the phase response of the IR...

 

[Downtuned]

Thanks for all the in depth tests. Glad to see it's not me going mental!

Kefir should do me absolutely fine for now, just wanted to experiment really with a few on/off axis impulses at the one time.

Lecab3? Now that would be interesting!

 

[Kohugaly]

I was really surprised by the difference... I know there should be subtle difference.... but this was really big one... I stopped using LeCab2 because it didn't hat drag option unlike FL native convolver... I hope there will be some less "buggy" alternative to LeCab2...

 

[deLuther]

LeCab have slight delay and it alters result compared to exact convolution. KeFir is precise, but consuming more resources, especially with longer implulses.
Commercial convolvers like Voxengo Pristine Space or Knufinke SIR2 have low consumption, zero latency and precision.
Again (normalized and phase-matched):

 

[XxSicRokerxX]

Anyone else like ReaVerb best?

 

[Uros]

Again (normalized and phase-matched):

But according to this table, when comparing to SIR2 LeCab is truer to the source. Or, am I missing something?

 

[XxSicRokerxX]

But according to this table, when comparing to SIR2 LeCab is truer to the source. Or, am I missing something?

Actually i believe it reads. Sir2 = 1.50297 x 10^-7 ( .000000150297) whereas lecab is .0348906

So 0.000000150297 vs .0348906

Sir has less difference.

 

[Terminus]

I've said this before but there really needs to be a shootout for all the IR loaders around...I did a quick compare with Boogex and KeFir and could not tell a difference, but I've always stayed away from lecab as it never seemed to be as full sounding as the others.

 

[XxSicRokerxX]

^Boogex sounds very muddy to me, i know that a few people on here say its great, but for some reason i feel like 100-400hz are boosted in boogex, i get a real dull sound. reaverb and sir2 are my favs

 

[Uros]

Actually i believe it reads. Sir2 = 1.50297 x 10^-7 ( .000000150297) whereas lecab is .0348906

So 0.000000150297 vs .0348906

Sir has less difference.

Ahhh, yeah, I didn't register that somehow, even tho I attended an electrical high school (just goes to show how little I have learned there! ). Thanks, it's all clear now.

Btw it would have been better if all subjects in the table were presented with zero before the decimal point multiplied by 10^-x. It would've looked cleaner and more consistent. Just saying.

 

[XxSicRokerxX]

^ haha after awhile things just tend to slip our minds.

 

[deLuther]

Uros, you are right in some way, but this table will not be redone, unless I`m revive my dead HDD
For convenience of audio engineers there is second column in db

 

[Uros]

No problem man, it doesn't change the fact that the table is really useful
And yeah, I should've looked under the dB difference section.

 

[badmotor]

Wow.

I've been using LeCab all this time because 'it's what people recommend' it seems, and the features and blending different impulses blah blah blah. Just tried ReaVerb and compared it with the same impulse... I swear it sounds more 'solid'. Instantly converted.

I really didn't think there'd be a difference.