>>This fact makes a great difference in what you say.<<
Raul, can you articulate what the difference is?
The fact that the low pass slope starts out at 12db merely means that its initial rolloff is rather shallow...just like some of the respondents in this thread. If you read Velodyne's website, you'll find that the 12db/octave slope is its INITIAL slope, and that it drops off quite sharply after that...as high as 48db/octave!
Once again, this has nothing to do with one's ability to detect the location of deep bass. If you play a 30, 40, 50hz pure tone thru a low distortion sub (<10%THD), YOU WILL NOT BE ABLE TO TELL WHERE IT IS COMING FROM...PERIOD!!!!!!
If you say you CAN tell where that pure tone is coming from, not only are you completely delusional, but you probably believe in magic and all other sorts of nonsense. Try the above experiment and prove it to yourself....you obviously don't believe ME or ANYBODY ELSE who has bothered to do the research.
And if you can't tell where those low notes are coming from, YOU CAN'T PERCEIVE IT IN STEREO...PERIOD!!! What don't you understand about this?
So much has been written on this subject matter that it never ceases to amaze me how gullible people are who still force themselves to believe otherwise. Yeah, the earth is flat too...phhht.
If you want to mitigate the financial damage you've already done by wasting money on two subs, at least make the most out of the situation. Get an spl and chart paper and locate the subs so that they excite as many room modes as possilbe.
Better yet, place those left/right subs directly to the sides of your listening couch for an "ENHANCED perception of bass". This effect is only good from around 40-80hz, but is NOT "stereo bass". It's due to hrtf's...head related transfer functions. David Greisinger (Lexicon's "Bass Enhance") is one of the most respected bass researchers in the world and you would do well to read up on his research. Floyd Toole (Canada's National Research Council, head of Harman International Research Group) and Tom Nousaine are also close to his equals. Also pose these questions to psychoacousticians, acoustical engineers, and Phd.'s that you may come across.
Don't listen to me or the children in this thread. Read and listen for yourself. Perhaps some of you responders are subwoofer sellers and have a vested interest in perpetuating the false notion of stereo bass in order to sell more subs???
Regarding the Velodyne crossover slope, that's merely indicative of Velodyne's marketing choices, priorities, and compromises. Velodyne knows that most folks have a processor that gives a xover slope of 24db/octave, so why duplicate that in the sub? Why not give them something different? Same goes with their passive high pass filter. It's a shallow 6db/octave slope which some folks prefer, but most folks will choose the steeper 12db/octave high pass filter in their processor. A shallowe slope is ok, but if you cross it over rather high (80hz or >), the blend with the mains may sound a little bloated in the crossover region due to the overabundance of bass information there. Hey, it's all a matter of taste, but don't confuse crossover slopes with stereophonic deep or midbass, which doesn't exist. For purposes of discussion, I consider "deep" bass to be the first octave, or 20-40hz. To me, midbass is the second octave, or 40-80hz. Anything above that, I consider to be upper bass. Some people's definitions vary a little.
Mustang,
Call me all the names that you will. You have not shown ANY credentialed literature to back up your inference of being to hear stereo bass. Shall I assume you mean UPPER BASS, perhaps? Actually, Phil Newell IS an intelligent studio engineer and I have browsed his book a bit. Can you point to any particular passage where he claims that we can reliably perceive directionality in the low and midbass(subwoofer) regions?????? If not, kindly close the claptrap and peddle your subwoofer sales elsewhere.
Next you'll be talking about animal hearing experiments, right?......phhhht.
