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September 2007

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Subject:
From:
Graham Collins <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Thu, 20 Sep 2007 12:01:36 -0400
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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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