Amplifier with no speakers making sound

Kermit100 · 12th May 2013, 09:15 AM

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

peranders · 12th May 2013, 09:21 AM

Magnetic forces....

Kermit100 · 12th May 2013, 09:23 AM

please explain. p.s im actually studying electromagnetics at uni so do not hold back on the "slang"

KatieandDad · 12th May 2013, 09:37 AM

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.

Kermit100 · 12th May 2013, 09:43 AM

Im learning about motors mainly at this point in time, thats why i asked.

Mooly · 12th May 2013, 10:06 AM

Is it magnetic forces at work when its a transistor itself that is clearly audible and producing the sound ?

Magnasanti · 10:12 AM

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$ ).

DF96 · 12th May 2013, 10:14 AM

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.

Kermit100 · 12th May 2013, 10:15 AM

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.

Magnasanti · 12th May 2013, 10:16 AM

Well when I say "cheap" I mean not a mega buck go all out on "tweaks" such as shielding.

12th May 2013, 09:15 AM	#1
Kermit100 diyAudio Member Join Date: Sep 2012 Location: Bendigo	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

12th May 2013, 09:21 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Magnetic forces.... __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

12th May 2013, 10:06 AM	#6
Mooly diyAudio Moderator Join Date: Sep 2007	Is it magnetic forces at work when its a transistor itself that is clearly audible and producing the sound ? __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

12th May 2013, 10:09 AM	#7
Magnasanti diyAudio Member Join Date: May 2012 Location: Georgia	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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12th May 2013, 09:23 AM	#3
Kermit100 diyAudio Member Join Date: Sep 2012 Location: Bendigo	please explain. p.s im actually studying electromagnetics at uni so do not hold back on the "slang"

12th May 2013, 09:37 AM	#4
KatieandDad diyAudio Member Join Date: Nov 2011 Location: UK	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.

12th May 2013, 09:43 AM	#5
Kermit100 diyAudio Member Join Date: Sep 2012 Location: Bendigo	Im learning about motors mainly at this point in time, thats why i asked.

12th May 2013, 10:14 AM	#8
DF96 diyAudio Member Join Date: May 2007	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.

12th May 2013, 10:15 AM	#9
Kermit100 diyAudio Member Join Date: Sep 2012 Location: Bendigo	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.

12th May 2013, 10:16 AM	#10
Magnasanti diyAudio Member Join Date: May 2012 Location: Georgia	Well when I say "cheap" I mean not a mega buck go all out on "tweaks" such as shielding.

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