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Unfortunately, most subwoofers , like the one you're describing, need a separate amplifier. I don't know the model number of what you're working with but most Phlips subwoofers with that connection need an amp. Now, if you have the rest of the system that was originally with the sub then you can scavenge it's amp. But that's tricky if you don't know what you're looking at. Craigslist has tons of "powered" subwoofers that don't require a separate amp and u can therefore use your Sub Preout from the HT receiver.
What do you mean that it sometimes doesn't work? It doesn't power on automatically? Check settings of your receiver - if it has subwoofer output enables and if low frequencies from all channels are directed also to the SUB. By default only the LFE channel (.1) of 5.1 signal input is fed to the subwoofer. So Sub will work in this case only when you listen to 5.1 signal (DVD movie for example), but for radio or stereo music, only front speakers are used. By configuring this bass redirect, you can use subwoofer for all signal types.
The spkrs sound like they are bi-amp spkrs, meaning you have multiple terminals on the backs of each spkr, the jumpers on the spkrs should be connected as such. Now you just connect the spkrs according to the Denon spkr conection diagram. Do not use the surround back unless you have 6 or 7 pair of spkrs
1 Use MULTI-CONTROL to select SW CONTROL. 2 Press MULTI-CONTROL to display the setting mode. # Press BACK to return to the previous display. 3 Press MULTI-CONTROL to select the segment you wish to set. Press MULTI-CONTROL repeatedly to switch the segment in the following order: REAR SP (rear speaker setting)—PREOUT (RCA output setting) 4 Use MULTI-CONTROL to select the desired setting. Turn to change the setting. When REAR SP (rear speaker setting) is selected. REAR SP:SUB W(subwoofer)—REAR SP:FULL (full-range speaker) When PREOUT (RCA output setting) is selected. PREOUT:SUB W (subwoofer)—PREOUT:REAR (full-range speaker) # When no subwoofer is connected to the rear output, select REAR SP:FULL.
you haave either connected it incorrectly.make sure the ohm of the speaker matches that of the amp ..connect the positive coil to the positive coil at the back of the sub and the same for negative .then run your cables to the amp .you should only have one positive cable and one negative cable .this connection will create a 2 ohm connection make sure the amp can handle that load .prefarably using a 2 channel bridgable amp or 1 channel monoblock