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Subwoofer connection

I've read quite a few posts on subwoofer connection for 2 channel amp/preamp. Here are different ways of connections from what I have read.
1. Using speaker wires.
a. Serial connection: from amp/preamp to the subwoofer in, and then from the subwoofer out to main speakers.
b. Parallel connection: from amp/preamp to both subwoofer and main speakers.
2. Using RCA cables, from the amp/preamp RCA out (or tape out) to RCA input of the subwoofer. Some people suggest to use just one wire from the left out from the amp/preamp to the left in of the subwoofer. This option is not possible for amps that do not have RCA out.

I have a subwoofer that allows those three different connections. However, I could not conclude which connection would be the best by reading posts. I might need to make my own decision for best result, but I would appreciate it if any of you have some thoughts on this.
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ihcho OP
609 posts
 
Thanks for your comments.
The subwoofer has a 300W amp (from Keiga) and 12" woofer.
Currently, I have two different systems that I can use with the subwoofer.
1. 50W tube integrated amp with Tyler ref monitor
2. BAT vk60/vk30 with Tyler Linbrook systems

The ref monitor is rated 8ohm/88dB, and the linbrook is rated 4ohm/92dB. The subwoofer is rated 4ohm/89dB. As for the specs, wouldn't it matte if you connect both the main and subwoofer in parallel if their impedances are different (4ohm vs 8ohm)?

Many thanks.
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