And then there's the Mythbusters mechanical Mercedes diesel powered
subwoofer that produced 161db @ 16hz. Was able to catch that episode and
watch the sunroof of the car pop out and the woofer tear itself apart!
http://en.wikipedia.org/wiki/MythBusters_(season_4)#Shattering_Subwoofer
Dave
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Thursday, September 20, 2007 12:20 PM
To: [log in to unmask]
Subject: Re: NTC:subwoofer
Here in the states there's this thing that's going on that guys try to pack
as much sound as they possibly can into their vehicles, I mean they go to
crazy extremes! They even have competitions of who has the most powerful
sound systems. They're really into low frequencies, the bass thump, thump,
thump.
Here's a video clip of a guy that has a Chevy Tahoe that has four 18-inch
subwoofers that's being driven by 20,000 watts! You can see the windows and
body panels flexing, and there are two girls, one sitting in the front
passengers seat, and the other standing outside the front passengers door,
who hair looks like it's being blown by hurricane winds when the guy cranks
the system up! Unbelievable!
http://www.stevemeadedesigns.com/videos/tremendob5.wmv
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Thursday, September 20, 2007 11:02 AM
To: [log in to unmask]
Subject: Re: [TN] NTC:subwoofer
Last time I cranked up my system my subwoofer was emitting this horrible
crackling noise... found a "Bob the Builder" toy crane on top of the cone.
If I was running Inge's power levels I could have blown that
thing through the roof!!! Can we wreck it? Yes we can!!!
>>> Phil Nutting 09/20/07 12:43PM >>>
I'm jealous. If I run anything louder than a whisper my family complains.
My cheap $10 computer speakers get me by. Sigh.
I did have a chance to turn up the big stereo system one day when my
daughter said her system was louder than mine. He, He, He, children are so
innocent. Seeing the challenge I sent her to her room to "turn up her
system". Once up there I put our old, 30+ years, stereo up to about half
volume. She quickly conceded.
Speaking of deaf neighbors, I was renting the house next door (100 feet
away) to a friend. One day while sitting on my sofa I started bouncing up
and down as the earth vibrated. Seems my renter had turned up his system
while playing the Eurhythmics "Sweet Dreams Are Made of These". Think what
it was like inside his house.
Phil
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric CHRISTISON
Sent: Thursday, September 20, 2007 11:26 AM
To: [log in to unmask]
Subject: Re: [TN] NTC:subwoofer
Are your neighbours deaf or do you live in the countryside?
Ahne Oosterhof wrote:
> 400 Watt and a 4 Ohm speaker?!? Make sure you have high temperature
> insulation on the speaker cables and watch out for the broken window
glass.
> That's why Philips made 400 and 800 Ohm speakers. Still got some.
>
> Ahne.
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
> Sent: Wednesday, 19 September, 2007 13:57
> To: [log in to unmask]
> Subject: [TN] NTC:subwoofer
>
> Audio techies,
> I've built a subwoofer with a 15" 400 Watt loadspeaker (4 Ohms).
Bought a
> 200 Watt low frequency 12 V amplifier. For that one, I built a 12
VDC
power
> supply with 15 A toroid, regulator, OP amplifier and a backup
consisting of
> totally 100,000 uF on the output. What is your experience? Will
these
caps
> be enough to take the short power tops in Space War or the enormous
sound
> effects in Matrix or Jurassic Park? Any thumb rules or maths? /Inge
>
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--
Eric Christison Msc
Mechanical Engineer
Home Personal, Communication Sector
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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