I agree with hilde45. I went with JL Fathoms over Rel. They offer much more flexibility in set up. They have full adjustable phase to adjust for proper placement. They also have built-in room correction via eq. Another point for me was that they are built in USA which makes service easier if it is needed for me. 

The whole high level input is over rated imo too. There are also more than a get folks that have damaged amps by not having the high level connected properly. 

Unless you are using a sub array, the settings on the back of subwoofer, even a basic EQ function, is in my mind, while not worthless, not that far off.

IF you are going to go the sub route, please invest in a microphone and learning something like REW. For the most part, you are wasting your money if you don't.

If you are an analog "purist" let it go. Sub bass management is best done with DSP. Your hearing acuity is low, and speaker distortion high at bass frequencies. Nothing an ADC / DSP adds to the system is going to impact the SQ, other than in a positive way.

If you go the way of @oldhvymec , treating the room significantly, then there is less need for EQ/DSP, but it can still get you that last bit of tuning. I have both. DSP gives you more flexibility with placement.

Seems like every thread becomes contentious anymore. If you don' like the word "Rel": in the title, then instead of seeing red and getting you panties in a wad why not look at it this way

How does a REL subwoofer add dimensionality and depth to a sound system?

The video is put out by REL. Do you REALLY expect them NOT to put their name on it?

I get it. You like the flavor of the month. It's Rythmik now. It was SVS previous. Before that Rel. And as has been pointed out, when I bought my 1st REL neither of these brands were in existence. The point that I got out of watching this video is that the bass itself is the very thing that makes the dimensionality and  depth. So IF that is the case then the bass of the Rythmik & SVS are also instrumental in this task

@oldhvymec I understand that you are knowledgabe. but how many times do you need to hear that the REL subs are NOT DESIGNED TO DECOUPLE NOW DON'T THOSE CHICKENS NEED TO BE FED? And LET THE DOG CHASE THAT RABBIT FOR A WHILE. hE NEED THE EXERCISE.(sorry. Didn't mean to holler...stupid caps lock)

@riley804

" But I’ve often wondered how my Rel subs make such an improvement to the main speakers."

doesnt he say how in the video ?

what was the point of starting a post if the answer is mentioned in the video

OK, So I got this in my messages from the above. Can someone tell him what the function of this board is?

I’ve been here 20 yrs now and have never had anyone email me something like this. Funny thing is , he too has been here 20 yrs and doesn’t seem to understand why it exists. As someone said earlier, this place has gone downhill quickly. I could understand this from a newbie. I’ve learned to expect most anything. Oh well. Let the games continue