StSin wrote:

So found a deal on an ok quality 15" passive sub (powered via 1/4 jacks). I've also got a spare marantz sr8002 receiver so figured I would power the sub with that receiver when I wanted some proper sound. My gut instinct is two connect the marantz to my current receiver by plugging an rca cable between the sub out of the main amp into one of the 7.1 channel ins of the marantz then use a set of banana to 1/4 cable from the corresponding speaker connections to power said passive sub, running the marantz in 7.1 mode and using it to control the sub volume. Would this work? TIA

To power that sub properly you need a separate mono power amp of 300 to 500 watts RMS.

The receiver will not adequately power it.

You need to connect the power amp between the sub out of the receiver and the subwoofer.

A question though; if the sub has 1/4 input jacks, that suggests that it is a powered sub, not a passive one.

StSin wrote:

Since no one else bothered to comment the answer is yes that works, and if you need basic stereo type advice you shouldn't bother posting here.

Yes, as you know, it will work but the gli pro XL-1580 is not a subwoofer and no technical specifications are provided by the manufacturer. Performance is unpredictable.