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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