]Īs far as the levels go, These are not lightbulbs drawing current. The bass management circuit in every (Dolby / THX) receiver strips everything below 80 Hz off of each of the 5 channels, sums it into mono, adds the LFE channel (if any) and THAT is what comes out the subwoofer jack. On DVD's released for home use, most MOVIE soundtracks have 5 full freq channels of surround info (L C R Ls Rs) and one channel called the "Boom" track this is the LFE in a movie theater. You might enjoy my freq to wavelength chart here: The actual LFE channel itself may go down to almost DC and up to 120 Hz (it's -3db point) and in the beginning (that would be 1996 or so) there was consternation about what happens to the "lost" area between 80 and 120 Hz when this stuff is summed to the subwoofer out jack, and it is that level of audio nitpicking which busy's people's brains and allows such things as republicans to slip into the white house. A theater can get away with multiple bass sources because the room is so big - typically much larger than the wavelength of the lowest frequency of interest, i.e.
Movie theaters usually have 5 channels plus a sub channel PLUS an LFE channel. LFE is an effects channel used in the optical track in movie theaters because there is not enough dynamic range in the optical channels for Low Frequency Effects. IF you only have one set of PREAMP OUTS in the abovementioned STEREO setup, you may want to use 2 separate Y-cords and effectively "MULT" the left and right outputs one set goes to your power amp the other set goes to the sub.įirst before we go any further is the LFE issue: THE SUBWOOFER OUTPUT IS NOT LFE !!!!!!!!!!!!!Īgain: THE SUBWOOFER OUTPUT IS NOT LFE!!! a "stereo", Then you would typically want to use 2 RCA-RCA wires from the preamp outs to both the sub inputs then you have the stereo summing taking place inside the sub which gives you mono bass while preserving the stereo signal separation going into the main amps. IF at this point you put a Y cord at the sub you are doing exactly the same thing as raising the level 6dB this is because you are summing 2 coherent inputs (voltages). The sensitivity of the sub, its panel markings, the settings in the receiver and so on all should properly track together to give a pretty close correct level in the room when everything is set to its relative "0" positions. If you are using a HOME THEATER receiver wih bass management, and have ONE sub out connector, then run ONE RCA-RCA wire. Sorry, but it the answers abov are a bit on the vague side here is the whole story:
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