Inge, She is probably afraid you will have too much 'energy'. Sorry, could not resist. Can not believe I beat Dewey to an opportunity ta-do-it Steve -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar Sent: Thursday, September 20, 2007 2:01 AM To: [log in to unmask] Subject: Re: [TN] NTC:subwoofer Wife didn't like car batteries under the sofa. She's little grumpy. /Inge -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke Sent: den 20 september 2007 00:10 To: [log in to unmask] Subject: Re: [TN] NTC:subwoofer Actually Inge, any bigger than that you might want to start using car batteries instead of caps...............8-) John Burke (408) 515 4992 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord Sent: Wednesday, September 19, 2007 1:57 PM 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 --------------------------------------------------- THE INFORMATION CONTAINED IN THIS E-MAIL MESSAGE AND ANY ATTACHMENTS SENT FROM GENTEX CORPORATION IS GENTEX CONFIDENTIAL INFORMATION INTENDED ONLY FOR THE PERSONAL USE OF THE INDIVIDUAL OR ENTITY NAMED ABOVE. If you are not the intended recipient, you are hereby notified that any review, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender by return e-mail, and delete this e-mail message and any attachments from your computer. --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------