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Old 8th November 2006, 11:13 AM   #41
palesha is offline palesha  India
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Normally there r two type car subwoofers available. one to be used in box & another for open air. The .QTS & Vas is very much different for both types. The SPL level of free air type is high & for cabinet type it is low. Just check what type of subwoofer u r using?
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Old 8th November 2006, 10:36 PM   #42
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Quote:
Originally posted by AndrewT
Hi,
I know that the deterioration in my car's structure and fittings is considerable and this is all due to vibration generally from external sources.

I also know that similar deterioration in my house has NEVER been evidenced. Our earthquakes are never above 4.

Why should it follow that a speaker cannot shake a car apart but can shake a house apart when my experience shows the opposite to be possible?
The "myth" they were testing in that episode was not to see if bass could shake things loose over time. They were trying to prove or disprove if high SPL can instantaneously make car windows explode(not crack), doors and tires fall off, etc.

When I said they don't know anything about speakers; I mostly meant their general construction. They made the surround so tight I was surprised it lasted as long as it did.

I'm sure you can find the episode on the net. Watch it and you will see what I mean.
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Old 8th November 2006, 10:50 PM   #43
Duo is offline Duo  Canada
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On the topic of speakers causing structural damage to houses or cars, I will mention that I notice structural degradation of my house most likely caused by the operation of my stereo.

It is evident that there's a lot of vibration going on since small plants on end tables and dishes in the cupboards are visibly vibrating and shifting.

The only things I really notice going on with the house's structure are apparent softening of certain things like the floorboards, door fittings, windows, etc. It is rather interesting.

There are a few acute artifacts though; one being that at high enough SPL and on certain frequencies, the power meter attached to the outside wall vibrates enough that the disc jams against the front flange. It doesn't stay jammed, just rubs while it's vibrating. Obviously too loud.
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Old 8th November 2006, 10:55 PM   #44
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When I made my isobaric subwoofer http://www.diyaudio.com/forums/showt...52#post1049952
I had to damp a lot of things in my house that were rattling. Mamory foam topper is the source of damping material.
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Old 9th November 2006, 01:42 AM   #45
Duo is offline Duo  Canada
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Yeah, the same applies at my place. We have to 'adjust' certain things so that they don't fall over. Paintings falling off the wall has been a problem. Books falling out of shelves is another.

A friend had similar funny ocurrance with his stereo; he had it set up at his father's place and during our listening session, an entire selection of curios worked their way into a terrified bunch at the back of the china cabinet. A wine bottle worked its way out of the wine rack and blew up on the bedroom carpet. Needless to say, there was proof of what had happened when his father got home.
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