Do I need a Y-adpater? A sound tech told me one sub wire would do the trick and just plug it into the L and ignore the R. Is this true?

You don’t “need” a y-adapter. It depends on your audio source. If you are using an audio/video receiver (like Yamaha/Denon/Kenwood etc) or a PC Sound card with a “sub out,” then that output already summed up the left and right channel’s bass frequencies (LFE) into one Mono output, and you can plug that into either RCA input on the PSW10 subwoofer. It’s also recommended to set the sub’s crossover dial as high as it will go (because the source will dictate the crossover point). Why then are there left and right RCA inputs on the sub, and a crossover dial? And Speaker binding posts? All of that is for using the sub as an amp to power (efficient) speakers. In that setup, you wire up the passive speakers into the subwoofer’s binding posts, plug the L&R RCA inputs into your TV or other source’s RCA outputs, set the crossover somewhere just above the speaker’s lowest part of their rated frequency response range (if you don’t know, I think 120 Hz is a good guess), and then the volume dial controls both the speakers and the sub (you can’t independently control the balance of bass to mids/treble). The sound quality like this is… not great. But if you need the option, at least it works?

Can this sub be added to a Vizio 2.0 sound bar, for small to medium-sized HDTV's? If not, what should I get? For TV/Games/Music

Like John, I too have a Vizio 2.0 sound bar and this pairs very well. I have a small theater room (10 x 20) and this one 10" fills the room. This sub is the best bang for the buck you can get.

Does this speaker have a volume control? Thanks.

Yes, it has a volume control. If you have an integrated amp or audio-video receiver (AVR), then you plug the speakers into that, and this sub into the sub-out, and use the AVR or amp to set the bass crossover point (and turn up the dial on the sub’s crossover so that you don’t have a “hole” between where you set the sub’s limit and the amp’s low frequency output). In this configuration, you can boost or decrease the bass emphasis by turning the volume dial on the back of the sub. In the fringe case that you don’t have a speaker amp, you can connect (efficient) passive speakers to the binding posts on the back of the subwoofer, and control the crossover and volume of the system from the dials on the back of the subwoofer. As you can imagine from a $200 subwoofer (I got this same model for half that), the amp in the sub for speakers is… not great. But it exists.

What in your opinion is the best power setting for normal use, "on" or "auto" for this unit.

I use the "ON" power setting because the Sub and my Receiver are plugged into a smart surge power strip. When the Receiver turns on/off so does the Sub. No wasted power.

Audio Driver Size	10 Inches
Audio Driver Type	Dynamic Driver
Is Waterproof	FALSE
Color	Black
Water Resistance Level	Not Water Resistant
Subwoofer Diameter	10 Inches
Speaker Type	Subwoofer
Woofer Diameter	10 Inches
Controller Type	Corded Electric
MP3 player	No
Additional Features	Bass Boost
Control Method	Remote
Warranty Type	Limited Warranty
Speaker Size	10 Inches
Audio Output Mode	Stereo
Antenna Location	For Home Theater Systems
Enclosure Material	Polymer
Mount Type	Floor Mount
Specific Uses For Product	Home Theater
Speaker Maximum Output Power	100 Watts
Compatible Devices	Home Theater
Item Weight	11.8 Kilograms
Item Dimensions D x W x H	17"D x 14.25"W x 14.5"H
Connectivity Technology	wired
Connectivity Protocol	Bluetooth
Wireless Technology	Bluetooth
Subwoofer Connectivity Technology	Wired
Frequency Response	250 Hz
Impedance	8 Ohm
Is Electric	Yes
Power Source	AC

PSW10 10" Powered Subwoofer Home Audio – Power Port Tech, Up to 100 Watts, Big Bass in Compact Design, Easy Setup with Home Theater, Timbre-Matched with Monitor & T-Series Polk Speakers

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