Sunday, July 6, 2014
pleiades dipole speakers
1 mount many full range speakers very close together
2 mount the speakers on a panel, baffle, or open back box. use an arc to avoid focusing
3 connect any combination of series parallel to make any impedance
advantages
1 deep bass from a large vibrating area moving a lot of air . limit is the low frequency reasonance of the drive units
2 extended high frequency response as the small mass of each small cone permits high acceleration
3 mutual radiation impedance
4 each cone handles a small part of the total energy, very small displacement, reduced nonlinear distortion, high power handling capability
5 no box coloration
6 bass response rolls off gently since an open back drops at only 6dB per octave
7 dipole radiation giving amazing sound scape imaging
8 no frequency distribution crossover network needed, no power loss, no phase or other distortion
9 projection as sound level of arrays drops slowly with distance
10 efficiency from back radiation, no passive components, 3, 9
Thursday, July 3, 2014
Pleiades Dipole Speakers
Using many close mounted small fullrange driver units for a large bass vibrating surface..
Open back or mounted on a panel.
Connecting series parallel combinations for 8Ohms.
Pleiades 1.27KHz Filter
Winding 26 turns on Magnetec 073 Nanoperm nanocrystalline toroidal tape wound core gives an inductance of 25mH inside an XLR adaptor.
Assuming a source impedance of 200 Ohms this gives a cutoff frequency of 1.27KHz.
Sounded great with a Shure Unidyne microphone at next to lips distance, no proximity bass boost, no pops, diamond sparckling sound.
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