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The benefits of SDA are immediately apparent when the speakers and listeners are positioned correctly. While it appears there have been improvements, the overall concept seems the same.īack then, we only detailed the technology to those who were very interested. I owned and sold Polk's original SDA speakers in the mid 80s. But in my experience, the effect is limited to a sweet spot, and other listening positions in the room get worse. I suspect that those who get used to the effect miss it when it's not there. I would describe the Polk SDA speakers of old as a cult product with a devoted following.
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The Polk SDA does it with separate drivers so that the cancellation is all acoustic. For these, the out-of-phase off-ear signal is delayed slightly to cancel only the crosstalk. I do have a small system with narrowly spaced speakers in a bedroom we use for exercise equipment-I didn't think to try it there but I might. It's interesting with small, narrowly spaced speakers, though mine has too high a noise floor to be something I would use routinely. I agree with his conclusion-with properly located loudspeakers, the effect is neutral or detrimental. I have an AK-500 that I bought for fun after reading about it on Roger Russell's page-the cheaper version that was housed in a large-scale integrated circuit. Their AK-100 was the expensive, discrete version.
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I thought Linn had speakers back in the deeps of time that used off-channel cancellation to increase the stereo effect, but now I can't find it or recall it.Ĭarver was famous for it with the sonic hologram processor built into some of their preamps (and as a standalone unit), but Hughes also developed the concept somewhat later with the "Sound Retrieval System", first marketed to the airlines for on-board sound systems.