That makes it just about right Our 10 oz are rated at 40 watts...We use them in a 70V config with a max of 15 watts...With a good can they sound great...Speakers with no backing are CRAP... That is why enclosure is so important...My Shack speaker is an original 15 inch Jensen with a 20 lb magnet. It was the first coax speaker Jensen made... It is in a blonde Jensen box that has 2 inches of sound deadning material and is bass ported in the rear. This make SW BROADCAST sound like a dream...
Bob W1PE -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of rbethman Sent: Friday, September 04, 2009 8:27 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Hallicrafters R-12 speaker The Jensen P12R uses a 7 oz. alnico. It is rated at 25 Watts. Certainly more than the radio will do by itself. My experience is that alnico magnets are more powerful per ounce than old-fashioned ones. That is why they use alnico and sometimes "rare-earth" materials in the head assembly of computer hard drives. It is one of the reasons for the reduction in size of drives. Bob - N0DGN Bob Peters wrote: > You are correct... They used Jensen and Quam but > only used 10 oz magnets...The magnet size is what > determines sound quality on a speaker... My > company manufactures both 5 and 10 oz but only up > to 8 "...Now you make that speaker a coaxial and > it will improve the quality by 50% or > more...Speakers are just like radio's... The > better the enclosure the better the speaker like a > transmitter and an antenna... > > More later on enclosure design/// > > Bob W1PE > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf > Of rbethman > Sent: Friday, September 04, 2009 6:21 PM > To: Discussion of AM Radio in the Amateur Service > Subject: Re: [AMRadio] Hallicrafters R-12 speaker > > Well, a Jensen P12R isn't "much" different in > price. > > The originals I do believe were made by Jensen. > > Bob - N0DGN > -- +------------------------------------------------- -----------------+ | AM Amateur Radio Operator NØDGN | +------------------------------------------------- -----------------+ | Bob Bethman \\\|/// " The absence of a danger | | \\ ~ ~ // signal does *NOT* mean | | [email protected] (/ @ @ /) that everything is OK " | +----------------------o00o---°(_)°---o00o-------- -----------------+ __________________________________________________ ____________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected] t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
