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ACI Titan V.S HSU-TN1225HO
Posted by Deon Bearden [IP: 209.179.227.194] on August 13, 1999 at 00:42:19 In Reply to: ACI Titan V.S HSU-TN1225HO posted by SMR [WizOp] August 10, 1999 at 14:54:27 No, Stuart, you aren't exactly correct. "No, that isn't correct. Doubling the power of an amplifier gains 3dB, as is outlined in the article linked to at the foot of this message." Correct, as does doubling up driver surface area. "Likewise, if two identical drivers in two identical locations receiving the same signal are used, the second increases the SLP by 3dB." Right. So if you've doubled the input power AND doubled the driver surface area, you get an increase of 6 db as long as the drivers are within one wavelength of eachother for the shared frequencies. "An example of this would be theatrical surround calibration. Left Surround is calibrated to 82dB SPL; Right Surround is also calibrated to 82dB SLP." Remember the distances they are from eachother. At the typical 80-100hz -3db point of surround speakers, a distance greater than roughly 5 feet ( five feet corresponding to a 113hz wavelength, there will only be a total net gain of 3db. That from the doubling of power, but NOT the increased effeciency of having two drivers within one wavelength of eachother covering the same spectrum. So... "When the two are combined, the entire output measures the required 85dB - an increase of 3dB" the above would be the net effect. however the same is NOT true when stacking subwoofers together. A 25hz wavelength is over 22 feet long. It isn't likely anyone is going to sepperate their subwoofers more than this distance in room, SO at 25hz, each doubling of sub surface area nets a + 3db gain in effeciency ( read that 2-4-8-18-32-64 drivers ) AND a gain of 3db for each doubling of power.
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