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TOPIC: Stereo Subs with DDRC88-BM and 5.1 source

Stereo Subs with DDRC88-BM and 5.1 source 1 week 4 days ago #33561

I have been reading Jim Smith's book Get Better Sound. He makes a very strong claim that using 2 subs one right and 1 left is essential to getting Great stereo sound. I recently acquired a good second sub and wanted to use it. With my DDRC88-BM and my 5.1 system. There does not seem to be an obvious way to accomplish this. I would have to split the Front Left and Front Right feeds to DDRC88-BM to make one for the high pass and the second for the low pass. Separately the front left and front right to create the 2 sub channels. It appears that the plug-in for BM has only the ability to channel the low pass filters to the LFE Channel. I have 2 unused channels for the 2 channels feeds. I am thinking that I cold additional the low pass filters in the outputs screen in the plug-in. Am I going to have trouble with sufficient current to feed two channels from one output form my preamp. Or is the signal to weakened by sending to 2 different channels?

Any Thoughts.
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Stereo Subs with DDRC88-BM and 5.1 source 1 week 1 day ago #33595

  • rts100x5
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when setting up speaker selection in calibration - choose CUSTOM .. this allows you to choose how many channels will be LFE ...

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Stereo Subs with DDRC88-BM and 5.1 source 1 week 1 day ago #33596

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yours will be 7 channels (5 +2 subs)

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Stereo Subs with DDRC88-BM and 5.1 source 1 week 8 hours ago #33622

  • DynaMick Audio
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You can also combine the LFE signal in the surround sound processor by selecting "No" or "None" for subwoofer which will output the LFE on the front channels. You may also have to select "Bass output" as "Front". Then you connect the 5 full range channels to the DDRC88 and use the matrix switcher and crossover to accomplish the routing.

This can be good to increase your crossover frequency of the sub to above 80 Hz, which will dramatically reduce distortion in your front speakers bass and midrange. It is best to use a higher crossover that is closer to the transition frequency of the room, usually 250-300 Hz depending on room size and dimensions. Below this frequency the reflections off the walls are similar to the wavelengths of the bass and it becomes more difficult to equalize the system to flat for multiple locations in the room. 80Hz crossovers are a relic of single subwoofer use, as below 75-80 Hz the bass is totally non-directional and allow for placement anywhere, though with very uneven sound at different seating positions. Non-directionality begins at the transition frequency and is similar to image shifting in the midrange.

I also strongly suggest corner positions for subwoofers as it will give you +6 dB or more and/or lower your distortion and power compression. Claims of "boomy" sound from corner subs are a result of the change in frequency response created by corner mounting--which isn't an issue for you since you are auto equalizing the frequency response to a curve. I also suggest pointing the subwoofer driver towards the strongest wall, as even at a distance of 15" from the wall creates destructive interference at the upper bass frequencies. Corner loading concentrates all the waves energy in the time domain for the tightest bass. :woohoo:

Hope this helps.
Dan Mick
Loudspeaker and Acoustics Guru
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