I had a question about the connection of this setup. The 3490 has two sub outputs and the PSW505 has a L/R filtered input and a unfiltered LFE single input (not using this since the 3490 does not a an internal crossover). Now, do I use BOTH sub outputs on the 3490 for the L/R RCA inputs on the sub, or should I use the 'Y' connector from just one output on the receiver to the L/R inputs on the sub?
EDIT: This is what the HK 3490 manual says about using a sub:
Step Two – Connect the Subwoofer
Connect the Subwoofer Outputs on the HK 3490 to the line-level inputs
on your subwoofer. The same full-range signal is output through both jacks.
Thus, you have the option of connecting each jack to the line-level input
on a separate subwoofer. If both pairs of main speaker outputs are in use in
different locations, you may install a separate subwoofer with each speaker
pair. If you have only one subwoofer with a single line-level input, connect
it to the right Subwoofer Output on the HK 3490. For optional auto turnon/
turn-off control over the subwoofer, connect the Subwoofer Trigger
Output for each subwoofer to the corresponding trigger input on its
amplifier. This enables the subwoofer to turn on or off together with the
HK 3490. To further conserve energy, when the trigger connection is made,
turn the Subwoofer Link Switch on to turn the subwoofer off when the
corresponding pair of main speakers is not being used, such as during
muting, when headphones are being used, or when the speakers are
turned off using the Speaker 1/2 Switch. See Figure 12. Consult the
manufacturer’s guide for the subwoofer for additional information.
Figure 12 – Subwoofer Connection