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Originally posted by bossobass:
lexicon's dr. 'G' (with bass enhance) is taking a page from bob carver's holograph generator and requires PRECISE placement of both speakers and listener's ears. these 2 points are, no doubt, why bass enhance is said to be room and source dependent.
Nothing could be further fron the truth. Carver Sonic Holography is based on crosstalk cancellation. There is a similar mode, called PANORAMA, in Lexicon processors which does crosstalk cancellation for 2-channel sources; albeit with much more sophistication than Sonic Holography.

Bass Enhance works by constantly varying the phase between the low frequencies on opposite sides of the room. This helps externalize the in-your-head, mono-sounding bass often found in studio recordings (especially pop music); makes it sound more like the bass you hear at live acoustic events.

Taking advantage of Bass Enhance is simple: you need two subwoofers placed at opposite sides of the room. Ideally the subs should be directly to either side of the listening area, but I've heard good results with the subs placed in the two front corners or anywhere along the side walls. The closer to the room centre line the subs are, the lesser the effect. With flexible placement allowed, Bass Enhance never "requires PRECISE placement of both speakers and listener's ears."

For more information, read the first few pages of the following Bass Enhance FAQ (quite interesting)...

http://www.smr-group.org/pdf/Bass_Enhance_FAQ.pdf
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lexicon is the only pre-pro available with stereo sub outputs AND A SEPARATE LFE output. my guess is that this configuration allows for the bass enhance feature, and is the only reason for it. otherwise, lexicon would be touting the many benefits of this configuration.
You guessed wrong; the Bass Enhance feature is not dependent on multiple subwoofer outputs. The MC-12 is the only Lexicon processor with multiple sub outs. More than for Bass Enhance, these outputs are actually designed to allow MC-12 users to treat derived bass and discrete bass as separate entities. EVERY OTHER Lex processor (including their new MC-8) has a single subwoofer output; yet they ALL have the Bass Enhance feature (a feature that predates the MC-12 by a number of years).
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the simple fact that bass enhance won't work if the LFE signal is summed with the redirected bass signal tells you that soundhound's setup won't either when there is LFE content.
On the contrary, LFE content is precisely what Bass Enhance was intended to be used for. The .1 LFE channel contains mono bass that has the potential to be perceived as coming from inside the head. This content is perfect for splitting into two channels and applying Bass Enhance in order to externalize the sound for more enveloping bass.
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dr. 'G' spent too much time developing bass enhance and overlooked the fact that the key to correct multi-channel audio bass is a DISCRETE LFE SYSTEM.
This makes absolutely no sense whatsoever. What does a process to externalize bass perception have to do with a discrete Low Frequency Effects track? Both co-exist quite well in Lexicon processors and aren't at odds with each other, either conceptually or in practical implimentation.

Best,
Sanjay
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Sanjay