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https://www.stereophile.com/content/snell-music-cinema-home-thx-reference-system
Mr. Thomas J. Norton reviewed the Snell system a while ago. The system includes SUB 1800, which supposedly is to be crossed at 80hz. Does the sub have an internal crossover to achieve this result? Or is the sub just a raw-driver-in-a-cabinet design where an external crossover should be used? Thank you!
Looks just like a cone in a box. https://images.reverb.com/image/upload/s--yVqsAuxt--/a_exif,c_limit,e_unsharp_mask:80,f_auto,fl_progressive,g_south,h_620,q_90,w_620/v1519529534/dg9pdvrejbuco3krrm3i.jpg
The subs do look plain, but I wonder if there could be a crossover inside -- i.e., how did TJN achieve the 80hz crossover? Was he using the sub-out from a THX-compliant amp (which I assume would cross at 80hz)? The driver itself is not likely to have the right slope for a 80hz crossover point naturally, and I do not know how a manufacturer could claim a sub has a certain crossover point if the only way to achieve it is through a third-party amp.
First, if there was any crossover, it would have to be passive.
Second, it is possible that the sub out did implement the LP filter for the sub.
Third, afaik, the company only quoted a FR spec to 80Hz but did not imply anything beyond that.
Can I ask why you are interested in this dinosaur?
Interested because I could obtain a pair for a very reasonable price. I agree if there is any crossover inside, it would be a passive one. But I prefer that it not have any, as I have a low-pass filter and intend to tweak the crossover point to better work with my upper-range speakers. I assume it would not be easy to open up the 18" driver and gut the crossover, if it has one.
Should be easy. Just pull the driver. 8 screws.https://img.usaudiomart.com/uploads/2018/47/649249711_large_7cc1601690b77fc769727522d8e6154a.jpg
Just tried. The speakers appear to have been glued as well. Even gravity did not do the job after laying the sub on the floor with the driver facing the floor. I did not want to pry the basket.
I think I will just try to feed the sub some higher frequency and see if the reproduction appears to indicate any internal crossover. I bought the subs already -- can't miss the deal.
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