Subwoofer Distance

I have a denon 2310ci and 7.1 setup my sub is behind my TV and measures 23ft where I know it is only 13 to 14ft max. In my room Audessey set my fronts to large, centre to small, surrounds to large, and surround backs to small. I am not really a strong bass person, but I think my sub should work harder. I turned LFE off, volume at 12'00 and frequency set to 150HZ on set-up.

Any thoughts would be greatly appreciated, Thanks .....Kevin

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11 Comments

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    Chris Kyriakakis

    Audyssey measures the signal delay and not just the physical distance. Every subwoofer has filters in it that delay the signal more than the main speakers. That delay is measured by Audyssey and compensated. Audyssey does not set speakers to Small or Large. Denon does. Audyssey recommends that speakers are ALWAYS set to Small when there is a subwoofer in the system. This allows proper bass management. I wrote about this extensively in my blog here: http://www.audyssey.com/blog/2009/05/small-vs-large/ Not sure what notation your sub uses, but normally you want it in LFE mode on so that all internal filters are bypassed. More sub setup tips here: http://ask.audyssey.com/forums/84181/entries/76175.html

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    Kevin Pitzer

    Thank you for you fast response in helping!

     

    One other question I have is that my subwoofer has a low-pass and and high-pass filter.  I know that I need to turn off the low-pass filter, howerver I am unable to do that with the high-pass.  My options are to set it at 100 or at 80; what would be the best postion to set my high-pass filter?

     

    Again thank you for you kind help!

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    Chris Kyriakakis

    Hi Kevin,

    I think you may have the notation backwards.  If your sub has an 80 Hz or 100 Hz highpass filter then it won't be getting any signal below those frequencies.  Highpass = allows frequencies above to pass and prevents those below from passing.  I think you mean an 80-100 Hz lowpass filter.  If you can't turn it off then set it to the highest frequency allowed and leave it there always. 

    If your sub does indeed have a highpass filter, it's likely there to stop rumble.  If you can't turn it off, then set it to the lowest frequency it allows.

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    Kevin Pitzer

    Chris,

    I do not have this backwards....Here is what the manual says and I don't know where I should set it.

    "High pass crossover switch This switch selects the frequency for the high pass crossover. This crossover is functional on both line and speaker-level outputs. Smaller speakers with limited low frequency output may prefer the higher 100hz setting which will reduce the low frequencies sent to them. Larger speakers with greater low frequency output may be able to handle the 80hz selling without strain."

     

     

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    Chris Kyriakakis

    That is very confusing language in the manual... If you run the signal to your main speakers through the subwoofer then the highpass filter setting sets the frequency at which that happens.  But, it's a terrible idea to use the subwoofer as a crossover.  The analog filters in there do not have the right characteristics and often result in muddy bass in the overlap (crossover) region.  The best way to set your system up is to let the AVR perform the bass management.  Hook up your speakers to the AVR and the subwoofer to the Sub out connector.  Then the highpass switch on the subwoofer becomes irrelevant!

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    Kevin Pitzer

    Thnak you again for your kind help!

     

    One other question I have is should I leave the crossover points selected by the Audyssey setup or tweak them?  After running Audyssey my fronts were crossed over at 40 hz and that seems a bit low....If I placed the cross over points higher my sub would be taking care of more of the low end making my fronts more efficient and taking less strain off them or am I wrong?

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    Chris Kyriakakis

    Moving the crossover points higher has two benefits: (1) improves the headroom of your AVR amps and (2) gives the subwoofer MultEQ filters more to handle and they are better equipped to handle it because they have 8x higher resolution.

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    Kevin Pitzer

    Chris,

    Thank you for your quick response....however I have the 2EQ not the MultEQ.  Does this matter?

    Also, what would you suggest for the crossover points be set at?

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    Chris Kyriakakis

    With 2EQ there is no filter correction for the subwoofer so it's less of a benefit to move the crossover up higher.  Still, the headroom benefit is still valid.  

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    Chris Kyriakakis

    The tradeoff is localization of the bass frequencies at the location of the sub.  As you start to go above 80 Hz you may start to observe this.  But, it's not a hard limit so it's good to try it.  The payback is better (smoother) response in the bass.

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    jiohn

    Since the subwoofer MultEQ filters are better equipped to handle bass because they have 8x higher resolution, why not set the crossover point at 100Hz or 120Hz rather than the THX default of 80H  I have Triad Gold LCR's and Surrounds, Silver Rear Surrounds and Platinum 18" Enclosed Sub. 

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