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RE: JBL LSR 308's and LSR 310 Sub in 2.1 Set Up

Posted by Jaundiced Ear on February 20, 2016 at 21:38:54:
Could you describe the outputs on your sound card? Do you have left and right RCA outputs? Do you have a single stereo 3.5mm output?

If you have a single 3.5mm output, then you will need a 3.5mm to RCA adapter. http://www.amazon.com/Plated-Stereo-Female-Adapter-Splitter/dp/B0146L3VDQ/ref=sr_1_9?ie=UTF8&qid=1456032426&sr=8-9&keywords=3.5mm+to+RCA+splitter

Thereafter, you will need a pair of male RCA to male XLR cables. http://www.amazon.com/Seismic-Audio-SAXFRM-2x5-Patch-Cable/dp/B00AFEMMVQ/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1456032294&sr=1-1&keywords=xlr+male+to+rca+male

Be certain to get these in the appropriate length! They need to travel from your PC to wherever your sub may end up. Note, this maybe much farther away from your PC than your sub is now.

Then you will need a pair of XLR female to XLR male cables. Again, be certain to get these in the appropriate length! Note, your sub maybe much farther away from your speakers than it is now.

If your sound card has RCA output, plug your male RCA cables into the RCA output and then plug the male XLR ends into your LSR 310's inputs. (If your card lacks RCA outputs, plug the adapter into the 3.5mm plug and then plug the cables into the RCA outputs.)

Then, plug your female XLR connectors into the output ports, and run the cables to the appropriate left or right speaker.

Make sure your sub and both speakers are plugged into AC outlets.

Look on the back of each speaker and set the volume knob to the 12 o'clock position. Set the sub's volume to the 12 o'clock position as well. Make sure the sub's crossover setting is set to 80Hz. Set the input sensitivity to -10dBV. Note also there is a polarity switch.

These are your initial settings. Using these settings, move the sub to various locations in your room until you find the best response for your setup. Be creative, well off to one side of the room may be the best for your setup. During this process, be certain to toggle the polarity control and listen for a bit with it in each position at each location. It can make a surprising difference.

Once you've found a place for the sub, I recommend orienting it so you have easy access to the back panel controls and connections. Then you can start using the controls to fine tune your sound. A little bass boost goes a long way, as does a little bass reduction. If the system is too quiet, then turn up the volume on the speakers and the sub, making sure to match all three for the flatest output. Have fun!

JE