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Hi,I understand the basics of bass management. What I am looking for here help in understanding how Marantz has implemented theirs. I called the factory, they were not helpful. I have a SR19EX. As you may know it allows you to set sub=on, plus a selection of THX or both. Both meaning it will send low freq to both the large front L&R and to the sub, sub=no meaning all low freq go to the front, assuming you have front L&R set to large. What I have not been able to find out is the following:
1) Is the x-over freq at 80Hz or 100Hz. Since it has the THX stamp of approval, doesn't THX demand it is set at 100Hz ?
2) If the actual ouput to the sub with movies is grossly extended, for example +12db room shaking explosive basss for movies, does this gross extension affect the music performance of the sub, or is all this dependant on the source material, i.e. movie DVD verses CD music?This is also where these questions are leading to:
I am adding a Jolida tube amp to my system because I have expanded the rear surround to support 6.1 offered by the SR19EX. I will use the internal Marantz amps to support the center/side/rear. The Jolida will be driving the front L&R. I have paid Jolida to install the factory pair of sub ouputs. This will allow me to move my sub connection from the Marantz to the Jolida and utilize the x-over in my M&K rather than the fixed x-over in the Marantz. I believe I will benefit greatly with music this way, but question the movie side. If I set the software in the Marantz to sub=no and L&R=large, will the Marantz send the movie related room shaking stuff out to the front L&R, (i.e. via the Jolida sub outs to the M&K)? Or is there something other than simple x-over freq coming out of the Marantz sub ouput I will loose in the configuration.Thanks, in adavance, for taking the time to read all this, and any suggestions you may have.
Jim
Follow Ups:
First things first.1) The THX mandated spec for crossover frequency is 80 Hz, with a 12dB slope for the high pass filter to the mains, and a 24dB slope for the low pass filter to the subwoofer. You want a swifter slope on the subwoofer to minimize localization effects out of the lfe channel.
2) The output to the subwoofer (actually the LFE channel) is padded by +10dB in the DD and DTS decoders, not by the analog output stage. Calibrating your subwoofer to a level value with the mains should get you flat response for music.
With respect to bass redirection, I'm not familiar enough with the Marantz receiver you're referencing to have a valid answer. What should happen though, is that the LFE gets redirected evenly across all speakers defined as Large. In your case, this would be front L+R.
One flaw I can see in all this is it looks like you might be duplicating frequencies between the crossover frequency in the subwoofer and the mains. I say this because the path looks like it would be:
Receiver L/R line output --> Jolida Tube Amp
Jolida Tube Amp SW output --> M&K SubwooferIf there is no filter in the Jolida amp the mains will get a full range signal and the subwoofer will duplicate frequencies below the crossover frequency.
If you choose to implement this configuration I think this would be a better connection path, though you'll spend a lot more in cables....
Receiver L/R line output --> M&K Subwoofer
M&K Subwoofer L/R output --> Jolida amp.On second thought, I think M&K sells some RCA filters that could be used in conjunction with the subwoofer to work this all out in the end. If that's the case, Bob's your uncle.
Regards,
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