Here are my impressions of the 18.0C and I will try to keep it as short as possible.
When the subs arrived each box weighed 94lbs. Inside the boxes, each sub was packed nicely with plywood, foam, plus plastic wrap. I spent no time tearing through the layers of wrap and foam to see the subs. Also, wrapped nicely in plastic wrap and foam was 10 feet of power cables and RCA to XLR adapters.
Visually, the subs look amazing. The subs were finished in black, it has a nice shine to it, rounded edges and has a sleek curved design. The 1000 watts amp on the back supports 2 XLR inputs, has an Ethernet and USB port to access the ALLDSP software.
My theater area is 12.3W x 15.6L x 7.8H, which opens up into a kitchen, & rec room. The dual 18.0C subs were placed near the front wall, and 2feet 4inches from the corners.
Before I could listen to the subs, I discovered I had a ground loop problem which was producing a loud hum when the subwoofers were plugged in and connected. With Nathan’s help, he advised me to purchase an isolation transformer for the TV cable feed to correct that issue. I ordered an isolation transformer for the TV cable, but In the mean time I disconnected the cable TV to test the subs.
Without applying Audyssey, proper volume level or using the subwoofers DSP, I listened to the subwoofer as is with random music/movies, and I found the dual 18.0C a tad boomy, but that’s expected without any room correction settings, proper volume and DSP settings applied. I then installed the ALLDSP software on my Macbook and connected to the subwoofers. I will tell you right now, that I found the DSP software daunting when I looked at it, and I am glad Nathan helped right through the DSP setup process. A proper DSP setup is very important to get the most of out these subwoofers and I would contact Nathan to help with the setup. I ended up using the No EQ profile, and since I sent Nathan my raw REW file, he advised me what to apply to the ALLDSP software PEQ settings. The setup was followed by Audyssey on my Onkyo 818 receiver and the crossover was set at 80Hz on all channels.
After the setup, I listened to a lot random music, movies and TV shows, that I am familiar with such as the The Menahan Street Band, The Wolverine, The 100, and a lot more. I focused on the upper bass range, then focused and lower bass range only. The boominess that I heard previously before any setup had completely vanished. Music and movies sounded tight, clean, went deep and blended seamlessly with my front speakers while never calling attention to itself. These subs just immersed me with quality bass, and at times while watching movies, it felt like I was a participant. It was that good.
The 18.0C’s are indeed excellent, which has a lot of punch, slam that will shake and rattle everything with ease with movies and music.
I did run into one slight problem with 1 sub, and that it produced a faint buzz noise which was audible when within 2 feet of the sub. It was not related to ground loop. Nathan advised me that he can swap out the amp on that one sub no problem.
I just want to mention that Nathan provides top notch customer service, so you don’t have to worry about anything as Nathan will take care of you. Nathan even took the time to help me during the night…I am beginning to think that Nathan is a cybernetic organism model T1000. Thanks again for all the help Nathan
The 18.0C is high a quality sub that will produce a high quality sound, and the built in DSP will help you get an even response in the room. I am very pleased with the sound these beasts produce. Also, the amps never get hot, and the subs do play very loud.
When I have time, I will post more pictures and my REW results.
Here is a pic and my REW results.
I believe I am having phase issues below 13hz, because when I change the phase, the response changes dramatically from what you see here at the tail end. Also, when I have time, I will try different PEQ settings to further smooth out the response.