Eclipse TD TD725swMk2

Can a subwoofer keep up with good audio loudspeakers?

Eclipse TD725swMk2
 Eclipse TD TD725swMk2

This magazine has covered a lot of subwoofers in its time, because in most rooms the best speaker location for bass reproduction is not the same as the best placement for proper mids and highs. This hold true whether we are discussing driver placement relative to internal cabinet vibrations or speaker placement relative to low-frequency room modes. Of course, there are some loudspeakers that require more bass reinforcement than others, and arguably the Eclipse TD loudspeakers are among the most obvious candidates.

But with great power comes great responsibility, and the task of bolstering up the bass is a difficult one when it comes to blending with the Eclipse range. This is not because the subwoofer needs to reach far into the midrange, but because of the need to keep up with those crossoverless, single-driver point sources. Eclipse did an excellent job with the award-winning TD725sw, a huge square box designed to sit in the middle of your living room. And now it has replaced it with the TD725swMk2, another huge square box designed to sit in the middle of your living room. This time, however, it has a nice piano finish, rounded off corners, and some shiny trim rings around the bass drivers.

If that were the sum total of the years of development gone into the two generations of subwoofers, this wouldn’t be much of a review. Fortunately, the model revision gave Eclipse a chance to go back to the drawing board, improving transient response, and pushing the low pass filter down from 40Hz to 30Hz in the process.

The TD725swMk2 uses the R2R (rear-to-rear) dual-driver arrangement found in its predecessor, with two relatively small 250mm Kevlar/paper drivers, joined together internally by an aluminium shaft. However, unlike most subwoofers (but in line with the other models in the Eclipse TD range), the TD725swMk2 not only joins the drivers together by this shaft, but makes the shaft the only means of support for the drivers, and they effectively ‘float’ inside the subwoofer enclosure. The two spots on the aluminium bar are coated in a vibration-reducing material, which means no stray vibration from the outside world can get in, and the loudspeakers do not influence the cabinet. This is about as close to a perfect interaction (as in, ‘no interaction’) between loudspeaker drive unit and cabinet as it is possible to make.

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