2 New ULS-15's
Installed 2 of these about 2 weeks ago and just wanted to share my experience and impressions. First, selecting these units was a long process and done after much reading and investigation. I needed something to replace a single Paradigm PW-2200. It never did have the output provide impact to the rather large living room that is open to the rest of the house. Perhaps adding a second unit would have done the trick, but I could not locate a second Paradigm unit at a price that was a fair value. I also considered building and installing an infinite baffle sub, but did not have a place in the basement that would work.... it was very interesting to learn about however. In the end, the fact that these were sealed 18" cube box, 15" driver, had a weight that indicated solid construction and an amp with high peak output plus some positive reviews won the day.
They arrived during a recent cold spell. I unboxed them and let them warm up for a few hours prior to set up. They really do look nice, rounded corners and flawless finish make them look great. I like the magnetic speaker cover fasteners and the solid feel of the controls on the back.
I started using REW with my old sub to see room response curves with various sub placement positions. None were perfect on their own, but there were two locations that complemented each other, that is to say, the dead spots on the response curve complimented each other. These locations are in opposite corners of the room more or less. I started placing the two HSU units in these locations.
I have a Denon AVR-4520 receiver with Audyssey dual sub calibration. It tends to set the sub level flat, as it should, I guess, but it does not sound good to me, so I was looking for a "House Curve" response with some boost on the lower end. I ran the Audyssey calibration with the sensitivity at about 1/3 on each sub. The Q was set to 0.3 and EQ to 1. After the calibration, I increased the Q to 0.7 and the Subwoofer levels increased by 3db in the receiver set up menu. The result was just as I hoped. The REW measurement are basically flat in the upper bass, then shows an increase in output starting at 40 Hz and increasing to 15 Hz, then a gradual fall off.
After listening for a few weeks I'm very happy with the results. With music, the bass is tight and reinforces the main speaker very nicely. Impossible to tell where to subs are located by listening. No problem energizing the room. Pants legs and chair vibrate on lowest notes, but windows and shelves do not rattle. Movies are more of the same with the addition of some over the top output on action adventure movies. Best results so far occurred during the war scenes in Hacksaw Ridge. Thump in the guts during artillery and explosions. Very much what I was hoping for.
There is my $0.02. Happy to answer any questions anyone my have, this forum has certainly helped me.