I'll share my thoughts on the Eona ATA 618 C since you left before hearing it.
A quick review about this cabinet
This sub houses six 18-inch neodymium woofers. It's an isobaric design which offers four drivers firing forward and, two drivers firing backwards to create a cardioid effect. This is powered by an 8400 watt (1400 watts x 6) amplifier. The amplifier is a Dual-Mono design. So, if one channel sees a fault and shuts down, it doesn’t affect the other channel not registering a fault. It weighs in at 240 pounds which, is not heavy considering it holds six 18-inch woofers, in addition to an amplifier offering two toroidal transformers. However, seeing that the weight is even on all sides of the cabinet, it’s dead weight. So, it’s like you are moving 300 pounds. Definitely not the type of box you want to be left alone to move around yourself because the roadies are too drunk to stand up much less, lift speaker boxes.
Sine wave listening
The sine wave sweep was interesting. To appreciate the lower notes, you needed to be furthest away from the source. My observation came from being at FOH, located at the rear of the club whereas, the 618 was close to the stage area. The response was very good. It actually didn’t offer any signs of strain all the way down to 20 Hz. Mark swept it at an average level, then a high level. Again no sign of strain. Just to let you know, a pair of these arrived on day 2. So, they were tested before playing the tracks.
Music Listening
IMHO the box sounded very good. It went loud and low with ease. Bennet requested to push it harder for he wanted to hear how loud they would go before they began breaking up. So they were pushed harder. The limiter really clamps down on the amplifier. At this point, I decided to walk over to the box to hear if any port noise, burning voice coils, or cone breakup was apparent. Many Labsters were hanging out behind the box to find out if the rear firing eighteens were doing their job. When I arrived to the source, the SPL of the upper bass sounded as if I was sitting in front of an EAW KF 850. The gain got reduced for it was getting too excessive, and many were walking away from the box that were standing within its pathway. We then moved over to the final track.
There was one track that Greg Rosenkrans from EM Acoustics provided. We began calling it the subwoofer killer because subs were smoking due to the severe low frequency sine waves the track offered and, learned it would be best to use that track last. I was back at FOH and decided to take a venture towards the back of the box to hear if the cancellation was noticable for myself. As I maneuvered my way towards the back of the box, the top box wasn’t working. The breakers tripped on both amp modules. We need to keep in mind that this box was designed for 220 volts and was wired to 110.
As Bennet pointed out before the sine wave testing, that Eona warned him that the breakers were never switched, and excessive sine waves will trigger the breakers in which it did.
If you can feed them 220 volts that minor altercation would not be an issue.
Best Regards,