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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Mixed crossover and phase relationships? posted by KanedaK on September 1, 2016 at 06:59:32:
Each single pole component(coils or capacitors) introduces a 90 degree phase lag in addition to the phase lag the speaker coil, and it's acoustical center impart. The usual convention is to leave the woofer connected so positive voltage moves the cone forward, easily verified with a "click test", with a 9 volt battery. The upper components polarity are then switched to get the smoothest phase response through each crossover point.
Without testing, it is impossible to say what the phase of your particular component set up is in the crossover region. A simple test is to use a sine wave or band limited pink noise set to the center frequency of the acoustic crossover, the polarity that results in more SPL (sound pressure level) output is the "most" correct.
Depending on how close the components acoustic response and acoustic centers line up, it is possible that either polarity will have little difference in output in the crossover region. For this reason, DSP (digital signal processing)is used, digital delay and equalization can be employed to result in a smooth phase transition through each crossover filter.
Using FIR filters, it is possible to achieve a "dead flat" phase response throughout the entire audio range, regardless of crossover slope.
Cheers,
Art
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Follow Ups
- RE: Mixed crossover and phase relationships? - weltersys 07:48:36 09/01/16 (0)
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