Thanks, Wayne. I wanted to ask about the hissy and brittle audio on my own K3 a while back, but at the time, certain forces on the reflector seemed intent on putting down such audacious critique (NOT, I emphasise, anyone from Elecraft "central").
Instead, I chose to take the coward's option and just wait and tinker. I have attached some pieces of Dampamat, a material favoured by the car boom-box aficionados, to the underside of the K3's top cover. This improved the internal speaker's sound a little. Next, my outboard recycled small car pod speakers' cabinets were lined with Dampamat and their bass response was vastly improved. By way of a tip for others, I bought the Dampamat originally because the two linear PSUs used to power my K2 and K3 tended to hum appreciably on full load. Steel cabinets in a strong 50Hz magnetic field around big transformers make excellent transducers. Judicious application of Dampamat to internal surfaces and on two out of four sides of the transformer laminations has worked wonders. If only they'd had ali cabinets instead HI! I intend to create an infinite baffle (fancy name for a box without holes) around the K3's internal speaker and cover it with Dampamat. It's just a matter of finding a suitable potting box cover, or making one from materials to hand. That should improve the internal speaker's bass response but will also reduce its efficiency a little. I have many sets of headphones, so will address headphone audio in time, but I suspect a change of coupling capacitors will be on the cards. 73 DaveL G3TJP >wayne burdick >Mon, 06 Apr 2009 10:25:29 -0700 >Maarten, > >If you send me recordings of your K3 audio (and if possible, recordings >of your other rig's audio for comparison), Lyle and I will listen to >them and see if we think there's anything wrong (excessive hiss, >harshness, etc.). This is certainly not the case with my K3 or any of >those I've tested in my lab. > >If it turns out that nothing is broken, but that you perceive another >rig to be better in some way, then we will try to improve the K3 to >your satisfaction. Comparative recordings are the first step. > >73, >Wayne >N6KR --- http://www.elecraft.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
