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  #41  
Old 06-12-2013, 02:55 PM
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craig3972 craig3972 is offline
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Originally Posted by EarmarkMarine View Post
craig,
So how do you define stereo? Is it A) a function of two speakers positioned so that they confuse and trick the human perception so that sound is no longer localized?, or B) a true stereo recording with the entire group of musicians in one room with stereo mics?, or C) strong left to right bias, separate L/R information and L/R panning as created on the mixing panel?
Most of the contemporary recordings are highly compressed for playback on personal electronics versus esoteric two-channel systems. With high compression you have very little white space and without white space stereo is pretty much null and void.
You won't find many stereo mics in original studio recordings and certainly not in pop music. You won't find many million dollar album productions as in yesterday's music. Too much is done on a Mac laptop.
So where is this stereo image originating from? Do you hear it in your car? Or do you hear ambience. We can contrive an image in your car with time alignment using a digital signal processor. But without it, the driver and passengers are always closer to one speaker which creates both a phase inequity and an amplitude inequity.
If all those things are perfectly in place then stereo is confined to a sweet spot of limited depth and limited width. You might want to sell tickets for those few who want to sit on the swim deck and directly face the tower speakers. 20 feet behind the boat stereo speakers that are four feet apart are mono. If you have a horizontal array of four tower speakers close together then you have completely destroyed any chance of stereo. You can't have stereo off axis on either side of the boat. If there was a strong stereo bias then you would only hear a portion of the information off axis.
It's the placebo effect. If you have a preconceived notion of stereo then I believe you will hear stereo.
Heck, a vast majority of people who are bridging an amplifier to their tower speakers have an asymmetrical signal issue and aren't even aware of it.
At least the HD750/1 properly sums the signal.

David
Maybe I am mis-naming what I hear. In some music there are distinct effects that are perceivable in the sound coming from a stereo vs a mono configuration... while standing on the swim platform two tower HCLD's.
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  #42  
Old 06-12-2013, 03:37 PM
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EarmarkMarine EarmarkMarine is offline
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Originally Posted by craig3972 View Post
Maybe I am mis-naming what I hear. In some music there are distinct effects that are perceivable in the sound coming from a stereo vs a mono configuration... while standing on the swim platform two tower HCLD's.
Absolutely. The operative word is "some" music and you have to be in the sweet spot both from a width and depth standpoint as well as facing the speakers directly to discern this difference.
Now look at the flip side. With the same program material you will lose the contrasting opposite channel information when you get off axis. So with summed mono you get all the information over a wider pattern. 'Stereo' is great in a controlled environment such as inside the boat where the coaming speakers are like a headset or when you are in an ideal position. Outside the boat it is a very fragile effect.
HLCDs do not image under any circumstances. There is zero depth. Everything eminates from the depth of the grill.
However, with a DSP in a car and a summed mono signal we can place an image out on the hood of the car. And with speakers no higher than your ankles we can raise the perceived image to eye level. But its also very fragile. The really great imaging systems are only that effective for the driver or passenger but not both.

David
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  #43  
Old 06-12-2013, 04:57 PM
Nickracer9 Nickracer9 is offline
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Off topic but are these MHD 750's too much power for a pair of rev10's?
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  #44  
Old 06-12-2013, 05:42 PM
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Originally Posted by Nickracer9 View Post
Off topic but are these MHD 750's too much power for a pair of rev10's?
The JL Audio HD750/1 is rated conservatively and it is strictly regulated so it will deliver its full rated power down to an 11 volt supply....although you wouldn't want to do that to your batteries. A typical unregulated amplifier will lose 25%+ of its 14.4 volt rated power at a 12.5 volt supply. The 12.5 volts is realistic if not maximum at rest. You are somewhere in between at full alternator output. So the HD is about 30% more robust than most amplifiers with an equal power rating. Can the pair of Rev10s handle a single HD750/1 from a thermal standpoint? Sure, if you know how to tune the system and know how to operate the system. But, at that much power, there isn't a great amount of room for error when it comes to compression/clipping.
On display we run an HD750/1 per each Rev10, which I would absolutely discourage. Yet, we have never had a speaker fail. We use that extra power for the dynamic range or peaks but never get close to a dangerous continuous level because everyone using the system can identify compression and stays clear of it. We certainly enjoy the contrast and clarity from that extra power.

David
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