BTW, Mark, I was specifically talking about the Car as an acoustic environment.
All spaces have their own frequency response, which is by definition, imposed upon any source active within that space.
the Challenge , that piques my vague interest, is creating a spectrally neutral space, , with a balanced and tight time domain response , inside a Car.
I can do it in a truck body , no problem.... (see many mobile broadcast trucks etc, for example, www.fleetwoodmobiles.com )
but in a car?? it's nigh on impossible , (without making the car undriveable...._ , and that's even without considering the body itself as a resonant structure, merely the internal geometry and boundary materials make it a nightmare.... ....
about the only thing offhand that i can think of that might be made workable relatively easily (note, RELATIVELY) is something like the McClaren F1, where the driver is basically in the middle .... then at least there's some space between his ear and the side panel/glass , to give us the chance to deal with the resulting comb filtering effects and Hf reflections, and to do so with a stable stereo image...
As an experiment, I'll have to see about running a set of std room tests inside a car, and actually get some accurate overall response plots and enclosure resonance mode data.
If you've ever seen a thing called a "Waterfall graph/plot" of a set of speakers... you have seen a time domain related frequency response graph.... where it plots not only the instantaneous response, but the decay times that result from a source impulse.. in a speaker, this tells us whether there are ay undesirable effects caused, for example, by reflex ports, and cabinet resonance, for a room, or other acoustic space, this tells us about how long the room's reverberent field goes on for, and at what kind of frequencies it has longer anomalies caused by modal ringing.... . where it gets complicated is that different positions within a room have different responses, so one has to build up a series of these tests from around the room to be able to gauge accurately how the space as a whole responds.
believe it or not... the acoustic environment your music is played in, be it home, car or wembley stadium, is generally capable of having more impact on the end result than A.B or C pieces of equipment.... (unless they're REALLY badly designed.... )
typical consumer equipment responses don't vary by more than ±3dB within say 20Hz to 15KHz .... (as opposed to professional stuff , which can be really silly... for example, I have Mic pre-amps that are ruler flat to within ±0.1dB from 5 Hz to 300KHz) where as response level maxima and minima within a room can vary by 40dB easily.,.. sometimes more (especially in a cube shaped room)
My anorak is at last revealed......
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Topic: How NOT to install ICE !! (Read 4664 times)