Sub s for Dali Megaline system

Acoustat6, The Torus is -3db@20hz. It's flat at 25hz. I've had the Torus, pairs of JL audio's, Rel's and Martin Logans all in my setup. I didn't buy the Torus because I couldn't justify the cost of a pair of them in my almost full range system. They go plenty low if you listen to music which doesn't contain a lot of organ or you are doubling for HT. Qualitatively they were the best and I wouldn't hesitate to buy them if it were for 2 channel only and I had a lot of money that my wife didn't have better use for. - Jim

Well, aldavis was working and unable to respond. 24 hours in a hospital over Thanksgiving makes me grumpy so I will try to repond as kindly as possible. Instead of "guessing" I actually measured the response in my room in which I also measured Rel stadium, Jl 113 and 112, Martin Logan depth. This is obviously not an anechoic measurement but it did allow me to compare output "head to head" and have a relatively informed opinion on the subject. Of these the 113 goes the lowest. Now, with regard to price, as I stated, I didn't buy the Torus because of it. That said QUALITATIVELY to me it was clearly the best and this quality costs money. You could cheaply produce a sub with a lower f3 but would this make it "better". The higher you crossover the more quality matters. If you set the lowpass filter to roll off at 34 HZ(-3db) like me the difference is negligable. The torus is for a niche market - rich people obssesed with tonal accuracy who do not listen to a lot of organ music or synthesized bass lines which dominate the music. I object to people who state as a fact what they can not possibly know - anothers intentions. If you would like to check out a more " unbiased" source check out the AVS thread on Torus + Magico minis. One of the participants uses an RTA to measure the output with and without the Torus. The results are shown on the screen. No company b.s. no reviewer b.s. and no aldavis b.s. just the facts. I haven't seen it in over a year and don't remember the exact results. I'm too tired to look it up now. Peace - jim

Thanks Jim for reminding of something I forgot to mention. A filter in a sub which rolls off frequencies below a cut off value can be a very useful tool. The more octaves a driver has to cover the greater the inter modulation distortion of that driver. A number of well known subs have such a filter for this very reason. This will, of course, raise the measured f3 but will improve the accuracy of the driver. A perfect example of why f3 is a lousy criteria for judging music reproduction quality. If your are listening to H.T. then you may well want an earth shaker with a low f3 and very high output. These can be had very inexpensively. I never really understood why we never judge mains by their frequency response but we do with subs. If you listen to two channel music low e on bass is 41.5hz and a Boesendorfer grand gets you only to 27hz. Below this there is no natural music ( except pipe organ) and human hearing falls off at around 20hz. Yes fundamentals exist below this but all the subs mentioned have some significant output below 20hz. The Torus is a FANTASTIC sub for music. Not so great for H.T. imho. It has virtually no overhang to my ears and sounds highly damped which I think suits music but not explosions. Is it worth it ? Listen in your own home and hear for yourself. Be your own judge. - Jim