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You will notice a huge difference. I used to have a Q100 so I know. The sound quality of the Rels is excellent, but modern subs take into account the growing trend in home cinema, and the the extra deep bass content they have. Old Rels were never really designed to reproduce 20hz effects with major authority, as such modern subs like the Monolith wipe the floor with the old Rels for films, and the difference really is night and day.
Have you noticed the old Rel cut out on films when you play a little louder? I know my old one did. The Monolith simply wont do this till really pushed hard, harder than general use would require. The link between Rel and BK should bring some comfort in that the similar sound quality will be to your liking as well.
The antimode is the one box auto eq solution. Its similar to what Velodyne have built into their subs, but without me going into boring detail, its better.
A Monolith (or XLS400 if size is an issue) with the antimode will come in at around 600, and nothing will be better for the money. I cant see the SVS offerings giving you much more than a Monolith, and they are just as big. The SQ of the Monolith will be better than everything but the Ultra subs from SVS, and they are way above budget and size constraints.
In short, the Monolith or XLS400 with the antimode is going to be as good as it gets really for £600ish. If you want to save money, Russell might just be about ready to sell his Monolith too, I could ask if your interested, or point him to this thread?
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