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Old 12th May 2013, 09:15 AM   #1
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Default Amplifier with no speakers making sound

Ok heres the deal. When i turn of the speakers in both my Luxman l30 and new Marantz pm5004, and when i turn it up real loud (full way) while music is still playing through it i can actually hear the music from inside the amplifier. why is this?
Thanks in advance for your input
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Old 12th May 2013, 09:21 AM   #2
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Magnetic forces....
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Old 12th May 2013, 09:23 AM   #3
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please explain. p.s im actually studying electromagnetics at uni so do not hold back on the "slang"
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Old 12th May 2013, 09:37 AM   #4
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If you are studying electromagnetics at uni we should hardly have to explain why current or voltage through a wire can cause it to move and cause sound.
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Old 12th May 2013, 09:43 AM   #5
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Im learning about motors mainly at this point in time, thats why i asked.
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Old 12th May 2013, 10:06 AM   #6
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Is it magnetic forces at work when its a transistor itself that is clearly audible and producing the sound ?
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Old 12th May 2013, 10:09 AM   #7
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What year? Well like others said I would guess its electromagnetic forces interfering with the signal that is being processed. My receiver also does this ( 100$ ).

Last edited by Magnasanti; 12th May 2013 at 10:12 AM.
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Old 12th May 2013, 10:14 AM   #8
DF96 is offline DF96  England
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Lorentz forces (i.e. normal electric motor action), magnetostriction, piezoelectricity - all methods by which electrical activity can produce sound.

If there is no output load then currents will be low so my guess is piezoelectricity.
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Old 12th May 2013, 10:15 AM   #9
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i hope its not "cheap" ones they are a luxman l30 (around 1970 i think) while the other is a new marantz pm 5004 (bought it in 2012). but i do get what your saying.
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Old 12th May 2013, 10:16 AM   #10
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Well when I say "cheap" I mean not a mega buck go all out on "tweaks" such as shielding.
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