[DeTomaso] Large in Door Speaker Magnet Shut Off the Sound if it Touches the Door Skin?

[Christopher Kimball]

My opinion is that the magnet touching the doorskin would have no effect on the performance of the speaker. There are several things that might be happening, however. If the magnet pushes firmly enough against the door skin, the frame or basket of the speaker may flex slightly misaligning the voice coil with the inner magnet structure preventing the speaker cone from moving. Generally you would hear distortion first, however, rather than total silence. The other thing that might be happening is one of the terminals on the speaker may move or flex just enough to touch the basket of the speaker, which could certainly short it out if any of the other metal parts of the basket were touching the frame of the car.

Sincerely,

Chris



Sent via the Samsung Galaxy S9+, an AT&T 5G Evolution capable smartphone



-------- Original message --------
From: Ken Green via DeTomaso <detomaso at server.detomasolist.com>
Date: 2/12/22 10:54 AM (GMT-08:00)
To: Detomaso List <detomaso at server.detomasolist.com>
Subject: [DeTomaso] Large in Door Speaker Magnet Shut Off the Sound if it Touches the Door Skin?

Everything works until I firmly close and latch the door, then no sound even though the radio still on counting down time for a song?  It is hard to see the dynamics, but I suspect the speaker moves just enough for the magnet to magnetically attach to the door skin.  When the magnet attached to the door, it probably alters the magnetic field affecting the impedance of the speaker coil, and that may cause the radio to think there is a short and shut off the speaker signal.  Later it works again, until I shut the door.

I'm pretty sure it is not the speaker wires shorting out.

I'm thinking a layer of non-magnetic material between the speaker and door skin may fix it.
Has anyone seen this?
Thanks,
Ken
-------------- next part --------------
   My opinion is that the magnet touching the doorskin would have no
   effect on the performance of the speaker. There are several things that
   might be happening, however. If the magnet pushes firmly enough against
   the door skin, the frame or basket of the speaker may flex slightly
   misaligning the voice coil with the inner magnet structure preventing
   the speaker cone from moving. Generally you would hear distortion
   first, however, rather than total silence. The other thing that might
   be happening is one of the terminals on the speaker may move or flex
   just enough to touch the basket of the speaker, which could certainly
   short it out if any of the other metal parts of the basket were
   touching the frame of the car.
   Sincerely,
   Chris
   Sent via the Samsung Galaxy S9+, an AT&T 5G Evolution capable
   smartphone
   -------- Original message --------
   From: Ken Green via DeTomaso <detomaso at server.detomasolist.com>
   Date: 2/12/22 10:54 AM (GMT-08:00)
   To: Detomaso List <detomaso at server.detomasolist.com>
   Subject: [DeTomaso] Large in Door Speaker Magnet Shut Off the Sound if
   it Touches the Door Skin?

   Everything works until I firmly close and latch the door, then no sound
   even though the radio still on counting down time for a song?  It is
   hard to see the dynamics, but I suspect the speaker moves just enough
   for the magnet to magnetically attach to the door skin.  When the
   magnet attached to the door, it probably alters the magnetic field
   affecting the impedance of the speaker coil, and that may cause the
   radio to think there is a short and shut off the speaker signal.  Later
   it works again, until I shut the door.
   I'm pretty sure it is not the speaker wires shorting out.
   I'm thinking a layer of non-magnetic material between the speaker and
   door skin may fix it.
   Has anyone seen this?
   Thanks,
   Ken