Mounting an amp on the box - DON"T !!!
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Gold Member Username: RovinTrinidad & T... Post Number: 3684 Registered: Jul-05 | Thought i'd share this cause i still see ppl doing/posting about it & i know some ppl are just too damn lazy to go search/read so here it is " - (Found on www.bcae1.com no 23 about 1/4 way down) Amplifier mounting: DO NOT mount an amplifier on your subwoofer box. I know that there has been a great deal of discussion over mounting an amplifier to an enclosure and many people do it all of the time with no problems but those people probably build good enclosures from 3/4" (or thicker) MDF with extensive bracing. Most people (especially young impatient people) are too lazy to do that and build unbraced enclosures from 5/8 MDF. These enclosures will flex considerably more than a proper enclosure and will likely cause amplifier failure if the amp is mounted to the enclosure. REASON: When the woofer(s) moves in or out, the box flexes and therefore causes the sides of the box to vibrate. This vibration is transferred to the amplifier mounted to the box. All of the electrical components in the amplifier have mass. Inertia (an object in motion tends to stay in motion, an object at rest tends to stay at rest) tells them to stay at rest, the box vibration is trying to make them move. The energy from the box's vibration is transferred to the components through the electrical leads which are soldered into the circuit board. All of this will cause the components to break loose and therefore cause the amplifier to fail prematurely. Basically, the amplifier will commit suicide! :-) I'm not telling you this because someone told me it was bad. I've been repairing amplifiers since ~1985. Virtually every amplifier that's come into my shop with parts rattling around inside them have been mounted on the speaker box. It causes the legs of the semiconductors to break (which causes amplifier failure). It causes the capacitors to break off of the board (which can cause catastrophic amplifier failure). It causes solder joints to break on the semiconductors mounted to the heat sink. It causes transformer windings to grind into one another (which causes lots of smoke to pour out of your amplifier). People who repeatedly tell others to mount their amps on the speaker box because they've never had a problem remind me of people who drink and drive and say there's nothing wrong with it because they've never crashed their vehicle. Eventually, in both cases, problems will arise. NOTE: Mounting the amplifier on the enclosure also allows someone to steal BOTH your amps and speakers at the same time with no extra effort. It's bad enough to have one or the other stolen but losing amps and speakers (and anything else mounted to your speaker box) is really gonna suck. |
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Anonymous | good thread |
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Silver Member Username: LexuscoopPost Number: 211 Registered: Dec-05 | yes it is, my friend is like a pro box builder, and he gets like this wood, idk wtf is it, but he like puts fabric on his boxes with staple guns, and the staples don't even in all the way, the an eight of an inch is still commin out... but he put his AMP on his box, but he like has a pacients for it... so yea... great thread |
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Bronze Member Username: BradrgilmanGALvEStoN , Tx Usa Post Number: 52 Registered: Nov-05 | Hey, Rovin, I have 2 kappa 3 way 6x9's mounted on my sub box, but in there own box. Is this going to cause problems to the speakers? Should I put some kind of foa in between them? The box is 3/4 mdf with great subs and a good amp, put it is ported so that may reduce most of the vibration. Also can you answer my other question about amplifiers and the ohm load? Also if you have the time, do you how Amplifers work, such as frequencies, ohm load, etc. |
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Bronze Member Username: BradrgilmanGALvEStoN , Tx Usa Post Number: 53 Registered: Nov-05 | I meant to say foam or padding. |
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Anonymous | maybe Jonathan or others can enlighten you if they see this thread |
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Gold Member Username: Tdeaton1021Near Tampa, Florida USA Post Number: 1354 Registered: Sep-04 | just cause the box is ported doesnt mean it wont vibrate. ported enclosures have more pressure than sealed boxes. |
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Bronze Member Username: BradrgilmanGALvEStoN , Tx Usa Post Number: 60 Registered: Nov-05 | yeah, but is the difference a factor in damaging my 6x9's. I know if vibrates, but what amount is crucial? |
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Gold Member Username: BestmankindLos Angeles, CA USA Post Number: 1317 Registered: Oct-05 | if you read a little more from bca1 on that subject, he tells you where to mount on the box if you must mount it on the box. i think when companies design amps, they take into consideration that you might mount your amp on the box. look at powered subwoofers, the amp is built in to the enclosure. |
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Gold Member Username: 54danny54Post Number: 1164 Registered: Nov-04 | wouldnt mounting ya amp on rubber bushings 2 the box solve it? |
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Gold Member Username: Basshead86Ocala, FL USA Post Number: 2714 Registered: Aug-05 | if you mount the amp on a 3/4" MDF box and the inside of the box is braced.....your fine. He says it in the first paragraph.  and if you build a braced 3/4" MDF box and mount the amp on two more pieces of 3/4" MDF then you are golden....trust me. |
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