Only technical choices matter, the peerless WB have been choosen for its ability to be listened in the far field at a short distance and compensate its drawbacks due to the small diaphragm with a superior definition in the high mids and the treble thanks to its extremely light AU cone+dome.
PS : i know that my XO points are audaciously low but i've found them acceptable by ear, 83hz and 143Hz LR24.
PS : i know that my XO points are audaciously low but i've found them acceptable by ear, 83hz and 143Hz LR24.
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@silverprout amazing project. I suspect the compromise would be to design the crossover the way to make the 8" drive volume knocked down to prevent vibration.
Thanks, I havent studied the crossover right now, the mechanical desing is not finished because the desktop decoupling is crucial and the spikes are not effective. The weight of the speakers should help to rise the self resonant frequency of the dektop plate but the if Z decoulping is impossible, it must be damped properly in order to have a very low resonnant frequency of the assemby (loudspeakers + wood plate).
It implies that the loudspeaker cabinets have to be suspended with elastics like a microphone to achive that utra low resonnant frequency.
It implies that the loudspeaker cabinets have to be suspended with elastics like a microphone to achive that utra low resonnant frequency.
I'm confused by this statement. Are you trying to couple the speaker to the desk or decouple it from the desk? And is there an intermediate structure between the speaker and the desk? Sorry if I'm misunderstanding what you're after or if you've modeled this interface and already understand what's going on.
Spikes are more typically used to couple.
Rubber feet or other methods to isolate/decouple.
These are just a couple of the off-the-shelf options. Some suggest cut in half racquetballs/squash balls as a cheap alternative (if you already have any of those handy and just want to try something quickly).
https://www.parts-express.com/4-Pac...x-25-32-H-41-x-20mm-Black-260-7520?quantity=1
https://www.parts-express.com/Talent-Resopad-XL-Monitor-Speaker-Isolation-Pads-233-066?quantity=1
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Hello, for me the spikes act like a spheric contact on a plane that supress 2 translations an 3 rotations, resulting Tz only.
To be simple as possible, the desktop is a rectangular plane with 4 forces in the direction of the roof (foots) and the loudspeakers are two forces in the direction of the floor. The plane is not perfecly rigid and can oscillate between the 4 forces and the two loudspeakers forces are osilllating, therfore if you supress these oscillations by damping the Tz from the plane, it will stop to oscillate.
PS : i want to have an adjustable inclinaison of the loudspeakers cabinets, the rubber foots are not damped enough and the foam will deform my strucural shell.
To be simple as possible, the desktop is a rectangular plane with 4 forces in the direction of the roof (foots) and the loudspeakers are two forces in the direction of the floor. The plane is not perfecly rigid and can oscillate between the 4 forces and the two loudspeakers forces are osilllating, therfore if you supress these oscillations by damping the Tz from the plane, it will stop to oscillate.
PS : i want to have an adjustable inclinaison of the loudspeakers cabinets, the rubber foots are not damped enough and the foam will deform my strucural shell.
I think the best table/top is a single block of marble.
I saw a guy who made a reinforced concrete casting covered with fake marble porcelain stoneware slabs.
Cool!
I saw a guy who made a reinforced concrete casting covered with fake marble porcelain stoneware slabs.
Cool!
I understand, what do you suggest?
Completely suspend the support of the speakers, hanging them from the ceiling, or perhaps with a wall mount. However, I basically maintain the fundamental positioning rules:
¹ they must not be too close
² detach them from the wall. (I see positionings that do not take this into account)
³ distance from the listening point.
Completely suspend the support of the speakers, hanging them from the ceiling, or perhaps with a wall mount. However, I basically maintain the fundamental positioning rules:
¹ they must not be too close
² detach them from the wall. (I see positionings that do not take this into account)
³ distance from the listening point.
Considering the whole assembly of the loudspeakers cabinets and the desktop equilibrium, i will use 6 horizontal natural rubber silent blocks on a frame for each cabinet with an ajusted gravity point or approximaly 3mm of static deflection. It will gives a 6mm of "not too unlinear" damped displacement and around 10mm of total damped displacement.
The frame is coupled with the desktop, the desktop is coupled with the foots and the foots are compled with the floor, the loudspeakers are free to move in every directions Tx-Ty-Tz-Rx-Ry-Rz.
I use them on 3D printers and i've been inspired by washing machines drums dampers or car motors supports. Have you opened the engine compartiment of a diesel car ? some are vibrating so hard that you c'ant keep your hand on it (don't forget your gloves) but the interior and the steering wheel are inert... there is just a residual acoustical sub bass horror.
Sedan car interior DW10 engine, idle yes... the acoustic mess is under the ponderation curve of the constuctor measurements.
Sedan car interior DW10 engine, idle yes... the acoustic mess is under the ponderation curve of the constuctor measurements.
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If the cone vibrations form a vector that points exactly to the centre of gravity of the box, the box could be suspended in such a way that it 'slides' without trying to rotate.
It could then be suspended by 2 pieces of fishing line, and a third piece to control the tilt angle.
It could then be suspended by 2 pieces of fishing line, and a third piece to control the tilt angle.
@silverprout I think you will achieve pretty good sound beating any average desktop speaker immediately but you have so many dimensions of experimentations - XO, table coupling - that it will take you months of work to get it to one more level up. Not directly comparing with me, because I'm a beginner, but I achieved more or less acceptable sound immediately, definitely better than my previous Dynaudio Emit speakers. But then it took me 5 months of tweaking to take it one more level up. So if Dynaudio is a high school team, the first prototype was playing like a college team, and 5 months later I was in NHL finals.
Kevlar is an outdated product, the ultra high molecular weight polyethylene is much better today (Dyneema).
Natural rubber is a best choice IMO.
Natural rubber is a best choice IMO.
we can't discuss fishing here 😎 , but the kevlar for 40cm on the leader, using a normal 0.35 allows to improve casting and in the water it is not very visible. The Pike is also suspicious and must be encouraged...