Some time ago I helped my young next door neighbour install a PA and speakers in his car. It used power cables as thick as my fingers. A week later I asked him how his stereo was. He proudly proclaimed that it had caused his rear view mirror to fall off the windscreen. So there is a new measure of sound pressure level, the rear view mirror. He didn't seem worried about how it sounded, maybe he couldn't hear it.

Rex Waygood
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Seymour
Sent: 20 September 2007 17:11
To: [log in to unmask]
Subject: Re: [TN] SV: [TN] NTC:subwoofer

Playing with car stereo myself.
These guys have the whole sound pressure thing down.

Windows re-enforced, doors screwed down submarine style.
NO ONE IN THE CAR. Remotely controlled.

180.5 db

http://gizmodo.com/gadgets/world-record/car-subwoofer-world-record-set-at-1805db-298304.php 


Here is another link:

http://www.crutchfieldadvisor.com/ISEO-rgbtcspd/reviews/20030826/db_drag_racing.html?print=1&page=all


dave

Hfjord wrote:

>I'll far from utilize those watts, maybe just milliseconds 
>/Inge
>
>-----Ursprungligt meddelande-----
>Från: TechNet [mailto:[log in to unmask]] För Ahne Oosterhof
>Skickat: den 20 september 2007 17:18
>Till: [log in to unmask]
>Ämne: Re: [TN] NTC:subwoofer
>
>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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