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In Reply to: Re: John, it gets stranger still... posted by John Kotches on April 14, 2003 at 20:50:11:
Who doesn't have a LP filter on the sub?
Follow Ups:
Kal,Sorry, let's try this one more time, so I can make my point clearer:
Subwoofer inputs can be filtered or unfiltered. Well designed subwoofers have both filtered and unfiltered inputs.
For movies, which will engage the crossover in the Processor/Receiver, you would want to use an unfiltered input, or for a sub lacking an unfiltered input, you'd set the subs internal LPF as high as possible (150+ would be ideal).
However, with Telarc's method, assuming you have mains with solid response down to 40Hz, you have an octave of information which will be doubled up. So you turn the LPF down to about 40Hz to correspond with the speakers -3dB point. Cool. That handles the mains. Any material on speakers (say surrounds and CC) which don't have the same response characteristics (say a 60Hz -3dB point) you've lost information between the -3dB point and the LPF engaged on the subwoofer.
You are also forced to change the setting of the LPF when you change between movies and Telarc's authoring standards OR use two seperate connections (one to filtered, one to unfiltered) if your subwoofer has appropriate inputs.
BTW, some of us use passive subwoofers, driven by regular amplifiers which don't have low pass filters.
So as I said, the more I think about it th emore potential issues I see.
On my Denon AVR-4800 you choose "LFE + Mains" and the bass from all channels from 35 Hz to 80 Hz is handled by the Studio 100s, even though the subwoofer is low pass filtered at 35 Hz. And much more nimbly than a Servo 15 would handle it.
Jim,This continues to stray ever farther from the defined standards.
LFE+Mains is a nice feature that has very little support in the industry. I haven't worked with Denons receivers, save the 1802, which didn't have this option.
It doesn't change the fact that the vast majority of installations will be problematic, though does it?
This isn't even remotely the "I'll look after you, automatically." type of bass management that consumers need.
Merely another complication in an already overly complex area. As a user of (fairly) full-range speakers all around, I have no problems with the Telarc arrangement.That said, I do now see your point and does require one to make a choice of default setup. Movies are relatively unimportant to me.
Kal,My breakdown is about 60% Music, 40% HDTV and Video, so it's more important to me. I suspect that in the world of multi-channel the norm is going to be much more balanced in music/movies.
As I said earlier, the standardized implementations of DD and DTS do have benefits in terms of ease of use.
We haven't really discussed the differing requirements of implementing the Telarc Height configuration vs MDG and Tacet's 2+2+2 vs. the Chesky 6.0 configuration.
With flexibility comes compexity which has to be deat with somehow.
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