OK...Added 2 HSU ULS-15Mk2 subwoofers To My System


After unboxing , I put one next to each speaker on the outside edge just to get started.
Followed the directions to get a base point on adjustments and then I listened to a couple of very familiar  Lp`s

I found that these subs are VERY distracting.....In a good way 
Naturally (at least to me) when someone adds a couple of 15" subs to a setup they have a tendency to focus their attention on bass and all that.
But I was hearing  many new sounds and DETAIL too that I had never picked up on before.
These sounds are not 'bass territory'... how does a Triangle image so much further out to the side now ?  

The next morning I dragged my Adcom 575 CD player from the garage system and powered up the subs only and put the RHCP`s Californication on repeat for about 12 hours or so.

Then did the crawl and moved the subs around and listened on and off over a week or so and then did another crawl and made changes to the settings on the subs too.
Getting better for sure. I think HSU recommends 30 hours for break in.

So far I absolutely love these HSU subs for what they are doing for my music !

I`m also finding that the numeric volume display on the Tortuga Preamp is down a bunch from my usual levels.

So, I now have 3 15" sealed subs in the room, the HSU`s and my Revel Ultima 15

Lindsey Stirling's` Shatter Me' has never sounded so good !

scm
Mo subs is mo betta.

When the bass is lacking we tend to turn the volume up more. That's because we don't hear low bass with anywhere near the sensitivity we hear midrange and treble. See: Fletcher-Munson curves. Now you no longer need to over-drive the rest of your system trying to make up for the lack of bass, you're able to turn the volume down and still be satisfied. 

Some of our sense of space is derived from very low frequencies. The waves of low bass are so long, 40 ft and more, they are associated whether we know it or not with large spaces. Adding the subs got you to where now those low frequencies are finally being accurately reproduced. This creates the sense of space that accounts for why your stage seems so much wider now. 

I hereby christen ye scm, DBA. Go forth and spread the Gospel!
millercarbon    Makes total sense to me Chuck !
I`m laughing at that last sentence btw ...:) :)

Steve
Welcome Sir scm DBA  to the multiple subs believer club:-)I've got four myself.