Bad audio noise on macbook pro |
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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Posted: 05 January 2010 at 8:45pm |
Hi all
got a wee problem with the MBP, and I think you guys may be able to help The internal soundcard has issues driving low impedance (hifi!) amplifiers, it cranks out noise almost equal to the volume of the music at full blast Is there anyway to lower the impedance of the input to the amplifier? Its a shielded minijack -> RCA connection .. ground loop thing? resistors? potentiometer? Dont really want to buy an ext. soundcard :/ Thanks
Edited by subbass - 05 January 2010 at 8:54pm |
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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jonminns
Old Croc Joined: 13 April 2008 Location: United Kingdom Status: Offline Points: 1877 |
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sounds like you've been unlucky and got an iffy one, the internal soundcard on mine is better than the serato boxes!
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4 ohms is for wimps
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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yeah, apple are notorious for bad batches here and there.. (QC doesnt seem to be that great all the time)
ill give applecare a call tomorrow
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Saul
Old Croc Joined: 15 June 2007 Status: Offline Points: 5912 |
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really??
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Lyndon A
Registered User Joined: 15 November 2004 Location: Bristol Status: Offline Points: 536 |
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Try headphones on it, whats it sound like then?
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FSV Sounds
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Are you sure you've not just damaged the socket somehow, such as pulling a 3.5mm jack at odd angles to the casing?
I've not heard of any 'common' issues with MacBook nor MacBook Pro internal soundcards. |
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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yeah, you wont believe the number of little issues I've had with various products of theirs - my iMac G5 had loads of little 'bugs', all firmware or hardware based. Then again it was practically a prototype
Bit p*ssed to spend this much on a damn computer for it not to be able to play audio consistently! ps. About the bad batches, you obviously have never had to go onto their support forums ! |
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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Believe me, its not the cable or the socket :( The noise starts when you turn the volume from MUTE to the lowest setting, even when nothing is output! Ie, when the internal circuitry is turned on The amp works fine with every other source, pc mixer or ipod... I found some stuff on the internet about impedence issues in some other macbooks, hence me taking this direction
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b3n
Registered User Joined: 28 September 2008 Location: Brighton, UK Status: Offline Points: 222 |
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If its a grounding loop issue its usually much louder when the charger is attached. Doesn't sound like what your experiencing though.
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5482 |
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A hifi amp will have a relatively high input impedance, headphones are low impedance. Why do you think it has anything to do with the impedance of whats connected to it out of interest? If you're getting noise equal to the signal my professional opinion is that something is shagged. Need more details really. |
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subbass
Old Croc Joined: 30 March 2009 Location: bristol Status: Offline Points: 1683 |
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just wrote a gurt big reply then deleted it
turns out its an issue with some kind of internal gain in the soundcard. Its a firmware / hardware issue and is triggered by the low impedence presented by the amplifier, causing it to go haywire and triggering the static.. Was told the generic "use a ground loop isolator" by apple to sort the issue, but until they can have a look at it (not an option, need it for uni!) they cant do anything else. so, have ordered a USB soundcard - output wasnt all that clean anyway :)
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