[jdub69]

i have a studio xps 16 when i plug it into my mixer wiyh the ac cord pluged in i getall kinds of noise but when on bat power its clear. have tryed 4 diferant ac plugs & 3 dif 1/8 to rca cables all monster & monster pro 3500 & monster 900 power conditioners. have taken the comp to other audio stores around me and still the same. the mother board has been replaced & bios updates have been done. has anyone heard off this or any ideals on what else i might try. have tryed audio guys & it people those hew have heard of this dont rember how or what was done to fix it.any ideals at all would be appreicated thanks. i know my typing sucks but think im getting better than 5 months ago.

[crazy4laptops]

jdub69, on 07 November 2009 - 03:25 PM, said:

i have a studio xps 16 when i plug it into my mixer wiyh the ac cord pluged in i getall kinds of noise but when on bat power its clear. have tryed 4 diferant ac plugs & 3 dif 1/8 to rca cables all monster & monster pro 3500 & monster 900 power conditioners. have taken the comp to other audio stores around me and still the same. the mother board has been replaced & bios updates have been done. has anyone heard off this or any ideals on what else i might try. have tryed audio guys & it people those hew have heard of this dont rember how or what was done to fix it.any ideals at all would be appreicated thanks. i know my typing sucks but think im getting better than 5 months ago.

i have experienced your exact same thing, you need to plug your laptop in on a separate power circuit from the amps/mixer

you might want to try plugging in on a separate circuit with a surge protector

i dont know the exact cause, but here's the theory i have... audio amplifiers/power transformers dump alot of noise/interference onto power circuits,

and when you plug in your laptop AC and audio to the mixer, it makes a pseudo ground fault...
with that ground fault in mind, since most electronics use a common ground, and if the ground/neutral line has noise, its gonna travel on the audio cable too...

hope this helps

-C

This post has been edited by crazy4laptops: 08 November 2009 - 11:56 AM

[nonseq]

crazy4laptops, on 08 November 2009 - 07:52 PM, said:

jdub69, on 07 November 2009 - 03:25 PM, said:

i have a studio xps 16 when i plug it into my mixer wiyh the ac cord pluged in i getall kinds of noise but when on bat power its clear. have tryed 4 diferant ac plugs & 3 dif 1/8 to rca cables all monster & monster pro 3500 & monster 900 power conditioners. have taken the comp to other audio stores around me and still the same. the mother board has been replaced & bios updates have been done. has anyone heard off this or any ideals on what else i might try. have tryed audio guys & it people those hew have heard of this dont rember how or what was done to fix it.any ideals at all would be appreicated thanks. i know my typing sucks but think im getting better than 5 months ago.

i have experienced your exact same thing, you need to plug your laptop in on a separate power circuit from the amps/mixer

you might want to try plugging in on a separate circuit with a surge protector

i dont know the exact cause, but here's the theory i have... audio amplifiers/power transformers dump alot of noise/interference onto power circuits,

and when you plug in your laptop AC and audio to the mixer, it makes a pseudo ground fault...
with that ground fault in mind, since most electronics use a common ground, and if the ground/neutral line has noise, its gonna travel on the audio cable too...

hope this helps

-C

Yeah, I agree with crazy, it sounds like floating ground to me. are both power cords three conductor or 2? are they plugged into the same socket? if 2 conductor trying flipping one over in the socket. if that doesn't work you may need to isolate the circuits. Make sure that your audio cables do not run parallel to the power cables and that if they have to cross they do so at right angles. You might want to consider a separate ground strap on the xps.

This post has been edited by nonseq: 08 November 2009 - 12:06 PM

[jdub69]

I have tryed other outletss in area that can be reached and the noise is still ther (for the comp). can u explain the ground strap please thanks.all plugs are 3 prong. have used a outlet teaster to make sure outlets are wired correctley. have the comp power cable runing away from all other cords weather it be power or auido someone has said that maybe runing a ground strap from comp to mixer might help but also might also or could expload the comp.its nice to finnaly get some type of feed back &help thanks it is very much appreciated. do not understand the seperat ground strap sugg thou.if u could explain please will gladly try it. again thanks & hope my lack of typing skills does not afend anyone.think im geting better.

This post has been edited by jdub69: 08 November 2009 - 05:49 PM

[crazy4laptops]

jdub69, on 08 November 2009 - 08:15 PM, said:

I have tryed other outletss in area that can be reached and the noise is still ther (for the comp). can u explain the ground strap please thanks.all plugs are 3 prong. have used a outlet teaster to make sure outlets are wired correctley. have the comp power cable runing away from all other cords weather it be power or auido someone has said that maybe runing a ground strap from comp to mixer might help but also might also or could expload the comp.its nice to finnaly get some type of feed back &help thanks it is very much appreciated. do not understand the seperat ground strap sugg thou.if u could explain please will gladly try it. again thanks & hope my lack of typing skills does not afend anyone.think im geting better.

there is a difference between a different outlet and a separate circuit (borrow an electrician/maintenance guy if you need to)

most of the time, all the outlets in the same room are on the same circuit, so you won't see any difference...

I have no clue what kind of studio/building you are working in, but you might to try running an extension cord (plug your laptop into it) to a different room to solve your problem...

lets say your audio room is next to the kitchen, plug an extension cord to a kitchen outlet and take the other end of the extension in your studio and plug your laptop into it

that is the simple way of trying for a separate circuit, and try more than one room if you have to, but the key thing is to find a separate electrical circuit from the one in your studio...

[jdub69]

thanks i will have to try yhis in the morning. do 2 everyone sleeping.

[Rommel]

jdub69, on 07 November 2009 - 03:25 PM, said:

i have a studio xps 16 when i plug it into my mixer wiyh the ac cord pluged in i getall kinds of noise but when on bat power its clear. have tryed 4 diferant ac plugs & 3 dif 1/8 to rca cables all monster & monster pro 3500 & monster 900 power conditioners. have taken the comp to other audio stores around me and still the same. the mother board has been replaced & bios updates have been done. has anyone heard off this or any ideals on what else i might try. have tryed audio guys & it people those hew have heard of this dont rember how or what was done to fix it.any ideals at all would be appreicated thanks. i know my typing sucks but think im getting better than 5 months ago.

Hi,

It sounds like the mixer is creating a feed back in the AC power.
When you are on battery, you are using pure DC power.
When you plug into an outlet, you are using AC power converted to act like DC.
Perhaps the NOISE in the ac power caused by the mixer is effecting how well your transformer is converting ac to dc??

Your room, assuming this is your home, should have 1 outlet on a different circuit. This is provided for lighting to work via a wall switch and is demanded by the National Electrical Code. Try that one.
If you must try the extention cord test and it works, keep in mind passing an extention cord from one room to another is also an Electrical Code violation if used permanitly. It is a tripping hazard and also could become damaged a cause a fire.

Your cables should be shielded, what is the quality of them. I believe monster makes expensive ones. My son plays guitar and has mentioned that name. He also records into his PC, a desktop using a mixer peddle thing.

How was this tested at the store? Does the mixer itself have an outlet and was used for the test?

As mentioned, confirm a different AC power source and make sure your cables are of good quality and all connections are firm.

More to follow....

Rommel

[nonseq]

Floating ground or ground loop can be hard to trace. I have been able to overcome it in some instances by running a wire which is attached to the chassis of the computer or device to true ground (not the ground in the electrics) which can be a water pipe or to a grounding rod outside of the house. There are some good suggestions here and one of the best is to ask an electrician.

[jdub69]

thank u all for the info. i talked to a guy from ableton his sug worked witch was to use a 3 to 2 prong adpter to do away with the ground prong and it worked. still pluged into the monster pro 3500 power conditioner &sounds fine. i will definley tell people to use this forum has been the most helpfull & and no bitching about my lack of typing skills much appreciated. if anyone sees a problem with doing away with the ground please let me know just happy to finally get somewher &hopefully its a good fix & wont kill the comp

THANK U ALL FOR THE TIME

[Rommel]

jdub69, on 09 November 2009 - 12:37 PM, said:

thank u all for the info. i talked to a guy from ableton his sug worked witch was to use a 3 to 2 prong adpter to do away with the ground prong and it worked. still pluged into the monster pro 3500 power conditioner &sounds fine. i will definley tell people to use this forum has been the most helpfull & and no bitching about my lack of typing skills much appreciated. if anyone sees a problem with doing away with the ground please let me know just happy to finally get somewher &hopefully its a good fix & wont kill the comp

THANK U ALL FOR THE TIME

I am glad you found an answer. I find it interseting but it worked.

Keep in mind you lost some personnal protection so always make sure your wires are in good condition.

Rommel

[jdub69]

thanks am carefull about all cables since i could buy something for 150.000 & spend the same if not more on the cables most likley monster cable. i do under stand the ground third prong, i am one to check all outlets with outlet tester to make sure they are wired correctly. my thought is that if im still plunged into the conditioner will have some protection although would fill more comfortable if the ground plug was in use. im hopeing that this is a temp fix seeing as i got this to dj & start a home studio with. i got the new one today so will try alll of the recomendations that have been posted on the old comp just to see if anything eelse works this is an old house wiyh a full breaker box my normal thing is to run a breaker just for audio & 1 for video. but on a job or dj evvent i will more than likely only have the optione of the one breaker witch is why im so happey to have at least got somewhear since have been trying to find a soulution four about 5 months. the hole comp thing is all new to me but am trying to get the hang of it do to all the software that is out thear and the crazey stuff u can do with it a great way to help stay sain & learn new things.