clipping sound on new iMac when Logix X is running

Hi everyone!

I've just purchased an iMac 21.5" with 16gb RAM and a Fusion Drive for music production in Logic Pro X.

I'm guessing that was a mistake after reading everything in this thread..

I have the same problem as some of you here, distortion, crackles, pops and a weird high pitched, bit crushing like effect when I try to record audio (and sometimes during playback in Logic).

The problem is fixed for a couple of minutes when I change my buffer size and Logic initializes the core audio but is back again after a couple of minutes.

Is there an update coming from Apple (is it something they can fix with an update?) or should I just send the whole thing back and buy something else?

What do you think?

Thanks in advance!

Apparently, depending on who you get when you call Applecare, they are working on a fix. I was told that they were aware and working on it when I called last week. Others have been told that Apple was not aware of it. It is very frustrating because you can't really tell when it is going to start and or how long it will last. It usually seems that booting from an External drive will prevent it from happening..... but that it not a fix.

Just a note that you should still call Applecare and register it as a problem

I spoke to Tech Support today and made them aware of my situation..

I've sent the Tech Guy an audio test, a test project and a system repport.

After reading everything here I don't think it will make any difference though.

If anyone hears or knows anything about what seems to be going on with the update please let me know!

UPDATE:

Received replacement iMac 2013 with 3TB non-fusion drive and setup this weekend. Audio problem is gone.

I'm using an Apogee Duet Firewire.

I just buy iMac 2013 with 256 Go SSD (it's the second, the first was with 1 TB Fusion Drive and didn't work).

I will tell you how it works with Apogee Duet Firewire. I really hope the answer is : "perfectly" !!!

David

Has anybody had any success with using a usb audio interface on a non fusion drive imac through a thunderbolt hub?

That seems to be an option with something like a caldigit thunderbolt hub provided that there is some proven success.

Eventually, I feel there will be a fix but," when", is the issue... I know some had success using the thunderbolt to

firewire adapter with their firewire interfaces. Any feedback is greatly appreciated. 🙂

I'm not convinced that will help. I'm using a Focusrite Saffire Pro 24, Firewire to Thunderbolt adapter and having the same issue. USB isn't the problem that I am aware of.

Philoking,

That is because there are two different issues... with two different causes.. and some people can be affected by both issues at the same time..

One is regarding the FD drive in 2013 iMacs... which affects all types of Audio Interfaces as well as internal Audio..

....and one regarding the use of USB2 interfaces via USB3 ports in certain OS X /Hardware configurations.......

The fix Beefus is posting about, is to help fix the USB2 Intertace in USB3 ports issue...

Ah, ok. Maybe a good time for a moderator to split these threads since they are two similar but not related issues?

Yes..I agree but unfortunately that would be a huge job given the length of this thread now... and we, the users, don't have any real contact with the moderators..... other than being able to report posts here and there... if you have reached a certain level.

On top of that, the Mods tend not to be knowledgeable about the subject matter here.. so they would probably make more mistakes in splitting the thread and putting some posts in the wrong threads... that would would cause even more confusion.....

Good idea though!

I would like to add my experience to this painful expereinece. I have a fresh IMac out of the box with SSD Drive and I cant use my Audio Kontrol 1 card I get crackles like pops and sound skips and distortion. I have tried all the trouble shooting I could. Native instruments said their driver is fine and kept saying turn off the power nap. . while apple think there is nothing wrong ??????

Caught between bothI bought the whole system for making audio to find out that external sound cards dont work on new Imacs !!!!!!! I am so fustrated right now and not sure where to take this from here

I have been informed that the engineering department are aware of, and work on, the issue... however no idea when a fix will be made... which is frustrating.

Hi deadphish, I did not try that yet . I tried it on a regular hub and it didn't work. At the electronic store we have in uae it costs like 80 $ for a powered hub which am thinking is it worth it to buy it and try not sure yet .i contacted apple today and again went through the same process at the end the support tech suggested that's it's not the mic problem rather usb3 and usb 2 sound card issue therefore he had a point, the part that is affected most will be the one that likely to address the issue therefore apple maybe not the cads but the soundcard company more likely more concerned . Now the more popular you sound card company is , the more customer base they have the more urge to find a solution . Therefore I think personally it's a deadlock at this point. The big question did anyone buy a niw late 2013 imac and actually managed to run his external spund cad on it with no issues ? No music for now other than scrambling for a solution.