StudioLive AR8, AR12 and AR16 Hybrid Mixers
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I've been successfully using a StudioLive AR16 USB connected to an iMac for over a year. Yesterday it worked ok, this morning I have a problem.

With nothing connected to the mixed except speakers and power cord, and all sliders at their lowest level - then with MAIN moved beyond unity there is a faint pulsing sound - at about 8 beats per second.

With the MAIN level low (e.g. 30) the pulsing cannot be heard, but if the level for ST17/18 is advance to 30 the pulsing can be heard much louder than before. No other channels make any difference.

When the pulsing can be heard loud, changing USB/SD Card from USB to "SD Card" appears to make the pulsing go away, but if you then increase MAIN towards maximum the pulsing returns, but much more quietly.

If the mixer is turned on while attached by USB to the iMac, the computer does not recognise it.

Has anyone seen this behaviour before? Is there an easy fix?
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by johnbarr1 on Mon Nov 05, 2018 8:17 am
Also, I can play through other channels. As long as the MAIN volume is not very high the pulsing is not audible.

But the existence of the pulsing at higher volumes, and the fact that the mixer won't connect to my computer remain significant problems.
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by tommasovercesi on Sat Aug 31, 2019 9:45 am
I have exactly same issue playing from SD card (channel 7/8 on my AR8)
Recording on SD card is clean, checked separately. Issue is on playing, not recording.
All other channels muted
Any suggestion is welcome.
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by soaringspider on Wed Jul 08, 2020 10:05 am
I have had the same problem on my AR16, which I describe as popping in the control room output. It is only there when 17/18 is on and the USB/SD button is set to select USB. It does not need to be connected to USB for the popping to be present. Audio from other channels still passes to control room as it should. Mixer was purchased December 2017 and the problem developed suddenly in January of 2019. Mixer was sent to Sweetwater (dealer) in February. They sent it to PreSonus and PreSonus was unable to fix it. Under their two year warranty Sweetwater replaced the unit. It has been fin since then, until this morning (7/8/20) when the original problem suddenly came back. I will be contacting Sweetwater this evening and if they can't help I'll be purchasing a new mixer, made by someone else.
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by SwitchBack on Thu Jul 09, 2020 10:30 am
I have a theory which can explain how a problem like that can develop over time, then to return even after equipment was replaced. It has to do with setup routines and wall warts or ESD (or both).

Depending on your setup routine and location not all gear is grounded before it's connected together. Gear powered from external power supplies (e.g. laptops) may not have a ground connection at all. Due to static electricity and the way ground isolated power supplies work the the various units can be at different voltage levels before the cables between them are connected. On occasion I've even seen small sparks fly when making connections.

This is still not a problem when it happens occasionally. Inputs and outputs are fitted with capacitors to protect the electronics from damage. The capacitors take the hit and, slightly worse for wear, live on to fight another day. Capacitors on audio inputs/outputs can easily outlive the unit this way.

But on data ports the protective capacitors have to be smaller or they filter out the high frequency data signals too. These capacitors can take hits but not as many as the caps on audio sockets. And once the capacitors go the electronics are next…

So with this in mind check your setup routines: Do you set up in a particular order every time? And in the same venue? Have a critical look at anything repetitive, with ESD (rubber soles and carpets!) and ‘floating’ equipment in mind. And take extra care of the data connectors as they are out of necessity the weakest point.
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by soaringspider on Fri Jul 10, 2020 1:23 pm
Thanks for that information. Unfortunately it doesn't help my situation. My AR16 is in my home studio and is always left attached to the other equipment in the studio. The AR 16 does not have a wall wart, it has a power supply (I suspect it is a switching supply) built into the unit. It is connected to AC mains via a standard three conductor AC power cord.
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by elliottrennie on Sun Sep 27, 2020 1:36 pm
*Sigh* 😔
I came looking for a solution to the problem, and we have nothing in two years from anyone at presonus. It seems this is a common problem when there is a USB line connected. I haven’t checked the revers yet, does the clicking/popping occurs when recording from the mixer to the capture software? I’ll have to give it a try in the morning.
My set up is home studio with a Windows 10 (AMD threadripper) connected to the USB and main out through 31 channel equaliser to the left and right Amp

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