Sound issue
in [Mac Systems]
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From: gavsko on 21 Dec 2009 19:21 I run itunes from a G4 quicksilver through an amp to provide music for the whole house. All the vocal sound now appears as if it is in the background (for CDs aswell). I thought it may be the amp blowing a channel but I tested it using a friend's machine and it's fine. Is the headphone socket (from where the phonos run) or hardware damaged or could it be (hopefully) a software issue? (10.4.11 OSX)
From: Erik Richard Sørensen on 21 Dec 2009 21:35 gavsko wrote: > I run itunes from a G4 quicksilver through an amp to provide music for > the whole house. All the vocal sound now appears as if it is in the > background (for CDs aswell). I thought it may be the amp blowing a > channel but I tested it using a friend's machine and it's fine. Is the > headphone socket (from where the phonos run) or hardware damaged or > could it be (hopefully) a software issue? (10.4.11 OSX) Try first these... - Go to System Preferences -> Sound and see if all settings are set correctly, i.e. 'Output' to LINE OUT/EXT. SPEAKERS and level not too high apprx. 33%-50% and control that 'Balance' is zero. - Check the cable that none of the cords inside the connectors are twisted or broken - that is both the 3,5mm minijack and the two RCA pone jacks. - If the problem persists go to username/library/preferences and move all the sound .plist files to the trash and empty the trash. Log out/in to be sure they are deleted. Again open the 'Sound' controlpane and check the settings for both 'Output', level and balance and again adjust the output gain level to apprx. 33%-50%. Now the prefs are renewed. - If the problem still is present, unmount all cables and close down the computer. Open the side and check that the tiny cable from the soundcard module is correctly and firmly plugged into the socket on the motherboard. This cable is a very thin one running from the soundcard module on the rear of the computer alongside the inner case down to the motherboard. If then the problem persists I'm afraid that the soundcard has blown off. It is seen before on the DigitalAudios and QuickSilvers - especially the 733mhz models and the QS dual 1ghz. You can replace the module yourself with a similar one from another DA/QS, if you can find a machine where fx. the PSU or motherboard is dead. - You can probably buy such a machine for very few bucks. If I remember right, the soundcard is only fastened with two small screws. Be aware that the cable from the motherboard to the soundcard _must_ be unplugged on the motherboard before you remove the soundcard, since there is no plug on the soundcard itself only the one going to the mobo, and there aren't much room to draw it out. Mount the 'new' soundcard the exact same reversed way you unmounted it. Be sure that the mains plug is out when you unmount/mount these smaller 'dingys'. If the mains plug isn't out there is still some voltage on the PSU and other parts in the QS and a false move could short other and more valuable parts of the QS. Cheers, Erik Richard -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Erik Richard Sørensen, Member of ADC, <mac-manNOSP(a)Mstofanet.dk> NisusWriter - The Future In Multilingual Text Processing - www.nisus.com OpenOffice.org - The Modern Productivity Solution - www.openoffice.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
From: E Z Peaces on 21 Dec 2009 22:53 gavsko wrote: > I run itunes from a G4 quicksilver through an amp to provide music for > the whole house. All the vocal sound now appears as if it is in the > background (for CDs aswell). I thought it may be the amp blowing a > channel but I tested it using a friend's machine and it's fine. Is the > headphone socket (from where the phonos run) or hardware damaged or > could it be (hopefully) a software issue? (10.4.11 OSX) Vocals are likely to be of equal amplitude and phase in both channels, so they get faint if you lose your ground. If you used the same audio cable to connect your friend's computer to your amp, I guess the cable is okay. I'd open the computer and make sure the audio ground at the sound card has continuity with the cable's ground conductor.
From: gavsko on 22 Dec 2009 07:07 Thanks, I'll give these a go. The cable/amp/speakers are not at fault, I've checked them. So the problem lies with the mac.
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