Audio crackles

Configure and optimize you computer for Audio.
Lophophora
KVRer
5 posts since 12 Apr, 2018

Post Fri Oct 12, 2018 12:57 am

Hi,

I have purchased and installed a brand new Focusrite Clarett 8Pre USB audio interface. Recently it started to produce crackling noises both when recording and playing. Before going further let me specify that I have a dedicated PC for my studio, that has been optimised for music production. Although it is not very recent, its specs should be more than enough to allow a smooth operation (Win 10, i7-4770K @3.5GHz, RAM 32 GB, 2x SSD).

I have tried various sample rates and buffer size combinations. The higher the buffer size, the less crackles I hear. However, I need to be able to work at 48 KHz with a total latency under 10ms, which I believe should be entirely manageable with the gear I have. I used a cheaper audio interface before (Roland Octa-Capture) and I never experienced any crackles, and had better latency values.

Any hint on what I should try in order to improve the situation?

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BertKoor
KVRAF
10643 posts since 8 Mar, 2005 from Utrecht, Holland

Re: Audio crackles

Post Fri Oct 12, 2018 1:28 am

Lophophora wrote:
Fri Oct 12, 2018 12:57 am
I used a cheaper audio interface before (Roland Octa-Capture) and I never experienced any crackles, and had better latency values.

Any hint on what I should try in order to improve the situation?
Bingo, you found the culprit yourself. Focusrite hardware is top notch, but writing good drivers is not something they can pull off.

But maybe the advice from second post in this thread works for you. Otherwise you could swap it for a RME FireFace UC. A bit more expensive, but rock solid performance.
We are the KVR collective. Resistance is futile. You will be assimilated. Image
My MusicCalc is back online!!

lfm
KVRAF
4560 posts since 22 Jan, 2005 from Sweden

Re: Audio crackles

Post Fri Oct 12, 2018 3:24 pm

Isn't there ADAT on that Focusrite, at least there are such versions I believe.
I looked at OctaPre with ADAT converters built in, but the cheaper version, not Clarett - was it Scarlet.

What you need then is a reliable internal card for digital audio.
I would have a look at RME RayDat or AIO - and no problemo anymore.
Using a single ADAT on RayDat does not need wordclock. AIO has only on optical in and out, so that works. I use HDSP 9632, which is a PCI version of AIO like that with both addon board and 8 preamps over ADAT.

Focusrite make decent preamps, so no reason to swap unless you need more than 55dB gain for mikes you use. That is what kept me away.

Kaine
KVRAF
1764 posts since 4 Nov, 2004 from Manchester

Re: Audio crackles

Post Mon Oct 15, 2018 2:40 am

Lophophora wrote:
Fri Oct 12, 2018 12:57 am
I have a dedicated PC for my studio, that has been optimised for music production. Although it is not very recent, its specs should be more than enough to allow a smooth operation (Win 10, i7-4770K @3.5GHz, RAM 32 GB, 2x SSD).
Specs are not really the focus here as you could pick up a top of the range system today and have it underperform exactly like this, all down to drivers running in the background. Please test it with latency monitor for 10 to 15 mins and check that it's passing.

http://www.resplendence.com/latencymon

Lophophora
KVRer
5 posts since 12 Apr, 2018

Re: Audio crackles

Post Thu Oct 18, 2018 10:35 pm

Ok here's what I get after a few tests.
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lfm
KVRAF
4560 posts since 22 Jan, 2005 from Sweden

Re: Audio crackles

Post Fri Oct 19, 2018 12:03 am

Seems rather high dpc latency to me.
I am constantly below 200us, but have RME internal card.

I believe WLAN adapters(WiFi) tend to increase dpc latency, and is recommended to be turned off.
To remedy that could be use cable to modem hub/router. No wireless network.

User avatar
BertKoor
KVRAF
10643 posts since 8 Mar, 2005 from Utrecht, Holland

Re: Audio crackles

Post Fri Oct 19, 2018 12:17 am

It says in the graph what the cause is: NVidia & DirectX Graphics Kernel. To cure it, put in another video card. If it's a laptop that's not really possible. If it's a desktop, then the question will be what video card to recommend. You don't need a gaming card, passive cooling should be fine. Only concern is to find one that behaves well.
We are the KVR collective. Resistance is futile. You will be assimilated. Image
My MusicCalc is back online!!

Kaine
KVRAF
1764 posts since 4 Nov, 2004 from Manchester

Re: Audio crackles

Post Fri Oct 19, 2018 12:36 am

DPC checker (the first one posted) doesn't work properly under W10 (as it mentions before you download it) so you can discount that result.

Latency Monitor, the other one as Bert has pointed out is suggesting the Nvidia driver. I'm going to assume you've got the full driver package on there, so it's probably "Experience" ballsing everything up.

Download the latest version of the driver. Run it and select the option that doesn't install "Nvidia Experience". Also tick the "clean install" option and choose custom and feel free to remove any other component you think you might not need. You only really need the core driver, but you might want the HDMI driver (audio to monitor) or such for other activities.

Retest, but don't do it for more than 15 mins. Windows starts to do housekeeping after the 20 min mark of being left untouched, which doesn't normally happen if you have it under heavy load as you do when you recording/playing. If you leave it for more than that, it leaves us second guessing if it really is a wonky driver or just windows cleaning the SSD or checking for updates.

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