It's a great little sub. That said it would be best with a small speaker system. If you want booming bass, spend more money. If you want a little bass boost to your sound bar or bookshelf speakers this a good fit for that. I sounds pretty good but like I said, this needs to match your speakers. What would be helpful is better inputs. According to the instructions/reviews you will want pass through this sub speaker and then into the your bar or bookshelf speakers. My issue is that my speakers run via Bluetooth so there is no way to do this without a tangle of wires. I prefer my music to hit the speakers digitally rather than passing through a bunch of cables which may have to be converted to analog and back at some point. Overall good little speaker just know the limitations going in.

This product is overly all really good very loud besides having to buy a separate cord for it to connect to my speaker it is great

The package came on time, no exterior damage to the box and the subwoofer itself was encased in styrofoam packaging which was relieving to see (compared to other electronics I've ordered and have been tossed into a box).

It's a really straightforward setup! I was initially having difficulty with my Yamaha receiver but after some trial-and-error, realized the "sub" option was turned off 🥲. After that, it's just been about finding the right sound setting between the subwoofer and receiver.

You get what you pay for! It's not going to rumble your windows or floors. But it has added some really pleasant bass to my shelf speakers that seriously lacked in that department. Very happy with this purchase!

Justo lo que necesitaba, a un buen precio, el único inconveniente, el botón de apagado (stand by)

Back in 2017, I wrote a review for a pair of Edifier R1280T bookshelf speakers that I had bought for myself.
I loved them and still do. I've since gotten another pair, in fact.

When I wrote that review, it was an honest, unsolicited review of a product I thought deserved praise, not a review written with any sort of motive. I'm not a professional reviewer or "influencer" or anything like that.

Little did I know, that review racked up tens of thousands of views and hundreds of "This was Helpful" clicks.
Cool. Glad to have been of help!

A few days ago, I got a message from Emma, a rep for an audio manufacturer called Bestisan, who had seen my review and wanted me to take a look at a subwoofer of theirs, one designed to pair well with powered speakers like the Edifiers. I agreed to purchase their subwoofer with my own money, so it would be the "verified purchase" review you see here.

Why would I do this? Well, I figured that if I really didn't like it, or I found some fault with it, I'd return it to Amazon, leaving me to write what I honestly think, with a clear conscience and very little risk.

(Edit: Just to clarify, I am not accepting any compensation for this review!)

The subwoofer arrived a few days later and a couple of days after that, I got around to unboxing it and setting it up.

It was well packed. Inside the cardboard shipping box were a couple of styrofoam supports and the sub wrapped in plastic. Not fancy, but sensible and utilitarian packaging. A plastic bag held the manual, a 3.5mm to RCA analog cable, as well as an optical cable. (Hmmm. Optical. Cool.)

I set the instructions aside as Emma had mentioned that some people had trouble setting it up correctly and I wanted to see what I'd run into.

The unit itself was solid and felt like modern, quality construction. It seems to be heavy gauge ABS, rather than the vinyl-covered chipboard that these things used to be always made of. The sub has just enough texture to not look or feel cheap. With a sub, though, looks really don't matter as it's going to likely spend its days out of sight.

On to setting it up!

The last time I used a subwoofer, it was designed to be attached to the amplifier, from which it received the signal. Not so, the Bestisan. This is designed to be the first thing in line. The signal source goes to the subwoofer first. From there, a line-level output goes to your soundbar, amp, or powered speakers. I found this conceptually confusing at first, but soon it made perfect sense.

Being first in line to receive the signal, they had the good sense to throw in a couple of extra input options. (Bluetooth? Sure! Optical? Why not?)

Bluetooth is great if you want to wirelessly connect your phone. This was something my speakers didn't offer. (It was an option I opted out of.)

The digital optical input is also cool to have. Your TV probably has an optical out, so you can use that to get the best possible signal, while still using your analog gear.

Setting it up, I connected the RCA cable from an Amazon Echo Dot to the input and then from the output to my Edifier speakers.

Something wasn't right. I was getting only intermittent sound from the sub and nothing from the speakers. This must be what others had run into.

I checked the connections and gave it another try. At this point, I noticed that pushing one of the knobs changed the color of the LED. A couple of taps and it was flashing blue, which told me that it was in Bluetooth connect mode. I checked my phone and sure enough, the Bestisan was in the list of available devices.
Cool.

A moment later, it was connected and it sounded fantastic! Rich sound streamed from the sub and speakers.

I tapped the input selector a couple more times and the signal from the Echo Dot was streaming in full, glorious quality (I think it was probably set to Optical when I first plugged it in.)

I spent a few minutes playing with the levels. What I found was that if you set the subwoofer's volume and Low Pass each to about 50% and adjust your input volume, you can quickly find a good setting. Add a bit of bass, dial it back, crank it up, play with it. When it sounds about right, you'll find that the sub's output is well-paired with the volume of the speakers at every volume, no adjustments needed.

So, do I recommend this?
Yes, I do. Whole-heartedly, in fact.

The Bestisan subwoofer adds just enough richness to the sound of the Edifiers. Digital music sounds much, much better.

The speakers sound bigger and the sound fills more of the house, while never sounding harsh or booming.

I didn't think I needed a subwoofer with these speakers, but now you'd have a hard time taking it away from me.

So, Emma, thanks for your patience in waiting for my review, but more than that, thank you for introducing me to the the Bestisan SW65D powered subwoofer! I'll be soon ordering another, to go with my other pair of Edifiers. Also, tell your bosses to give you a raise.