marsboer skrev:
Demping har jeg fått mindre og mindre sansen for. Det er nærmest umulig å dempe jevnt og man ender derfor nesten alltid opp med å dempe de øvre frekvensene vesentlig mer enn de lave noe som gir en skjev frekvensgang og tam lyd, riktignok svært lyttevennlig. Jeg tilstreber derfor alltid å plassere høyttalere og lytteposisjon for å minimere behovet for refleksjonsdemping og jeg har også innsett at retningsbestemt lyd er tingen i de fleste normale rom. Det vil si at jeg til slutt skaffet meg hornhøyttalere slik at førsterefleksjonsdempingen ikke lenger var nødvendig og det eneste jeg har beholdt er noen akustikkplater i hjørnene noe som gjør bassen litt tørrere, selv om amplituden på utslagene neppe reduseres merkbart.
Her er meningene til von schweikert om tilnærmingsmetoden din (og flere andre her inne):
PD How much can you design the room out of the equation when crafting a new speaker? Given all the variables involved between rooms and equipment, how does a speaker designer start to make choices and what are the various weightings on key variables?
AVS I am still shocked at how many experts state that since rooms are bad (i.e. reflective), a good speaker should be highly directional. What these fellows dont understand is that a piano or other instrument isnt directional and sounds fantastic in most any room. If you were to block off the sound of the piano, using baffles to direct the sound directly at both of your ears, you would hear a gross misrepresentation of a piano that has no basis in reality. In addition, concert hall design takes advantage of room reflections in order to enable the orchestra to sound full and rich, so your own listening room can be treated very slightly to reduce any deleterious effects that slight reverb might cause to the timbral response of the speaker system.
We use three different rooms with varying acoustics and dimensions, an Average Small Room, an Average Medium Room, and an Average Large Room. We can change the furnishings, rugs, wall treatment and so forth, in order to change the acoustics of the room. However, we start the design in the computer and design the various sub-assemblies by simulation (remember my aerospace background at Cal Tech). Then we test the concept in an anechoic chamber. Last, we do the final tweaking by ear in the three different rooms, making sure that the speaker will work well in any of the rooms. Even though we designed our UniField Model Three in the Average Small Room, all five of the reviewers, including Jonathan Valin of The Absolute Sound, wrote that the UniField Model Three sounded fantastic in any sized room. This is due to our averaging of the three different rooms acoustic response to the speakers radiation pattern.