Amp mounting

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charlie101_1999

Member - Posts: 40

Joined: October 29, 2002

Location: United States

Posted: April 23, 2004 at 11:07 PM / IP Logged

If you had to mount your amp on your sub box, is there anything you could do to help prevent vibration? Anything like a dynamat sheet in between them?

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kickerstang

Copper - Posts: 180

Joined: April 08, 2004

Location: United States

Posted: April 24, 2004 at 6:49 AM / IP Logged

your box shouldn't be vibrating, it should be solid and sturdy. put some internal bracing in if your box is vibrating

what!?!?! you want some??

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: April 24, 2004 at 8:16 AM / IP Logged

If you have some MDF left over, and some Dynamat, it wouldn't hurt to make a neat mounting block for attachment to the sub enclosure. Both materials will absorb energy. You might even mount the block to the sub using spacers, so that there are only the bolts that would transfer the energy, instead of the piece being flat against the surface. You would bolt the block first, then screw the amp onto it using different mounting screws so that the amp isn't touching the bolts. That would look nice, I'm considering something similar myself.

charlie101_1999

Member - Posts: 40

Joined: October 29, 2002

Location: United States

Posted: April 24, 2004 at 9:49 AM / IP Logged

kickerstang wrote:

your box shouldn't be vibrating, it should be solid and sturdy. put some internal bracing in if your box is vibrating

Hold your hand against YOUR box and tell me if you can feel anything. I'll bet a dollar you can.

Thanks for the advice stevdart. I'd been looking into something like that myself.

robbie2883

Copper - Posts: 104

Joined: August 20, 2003

Location: United States

Posted: April 24, 2004 at 9:50 AM / IP Logged

just get some reubbuer gromets and put about a 1/4 inch thick one under each mounting point of the amp....run the mounting screws through the hole in the gromet and there ya go....amp shocks!! crude as they may be...they help

if its jammed force it - if it breaks in the process it needed to be fixed anyway

robbie2883

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Joined: August 20, 2003

Location: United States

Posted: April 24, 2004 at 9:52 AM / IP Logged

[QUOTE=charlie101_1999][QUOTE=kickerstang]

your box shouldn't be vibrating, it should be solid and sturdy. put some internal bracing in if your box is vibrating

[QUOTE]

that theorygoes against everything i ever learn about resonance................

if its jammed force it - if it breaks in the process it needed to be fixed anyway

kickerstang

Copper - Posts: 180

Joined: April 08, 2004

Location: United States

Posted: April 24, 2004 at 11:17 AM / IP Logged

go buy yourselves some prefab boxes, load them up and see if you feel them vibrate. you won't because they are built right with bracing. if you build your own box and just slap 6 pieces of wood together in a cube then yeah your gonna feel some vibrations, bracing is what stops that.

i bet youa million dollars that every box i build you could put your hand on it and not feel anything. it's not that hard, it should be common knowledge that less vibration = less cancellation. bracing helps stop vibration.

what!?!?! you want some??

kickerstang

Copper - Posts: 180

Joined: April 08, 2004

Location: United States

Posted: April 24, 2004 at 11:22 AM / IP Logged

All enclosures should be constructed of at least 5/8'' - 1'' MDF (medium density fiberboard) or material of comparable rigidity or better. Bracing (not shown) should be used throughout the enclosures as needed to prevent any loss of energy due to flexing. For you SPL competitors, I repeat...bracing should be used throughout the enclosures.... Flexing = lost output. With all enclosures, lining the walls with a damping material (fiberglass batting, polyfill, tar based spray, etc.) is recommended to reduce high frequency resonances.

this is from the woofer enclosure section on this site, read carefully

what!?!?! you want some??

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: April 24, 2004 at 12:18 PM / IP Logged

The enclosure medium will absorb energy from the power or the sound waves. The energy that is not completely dissipated by the MDF is transferred into the air surrounding it, and into any materials that are in contact with the sub enclosure. Like the floor of the vehicle. Here is one of several sites that has information on acoustical transfer http://www2.sfu.ca/sonic-studio/handbook/Theme_sound_medium.html Flexing of the box is not the issue here.

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Amp mounting

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