It is like the old question of "Why does the dog wag it's tail?"
A: Because the tail can not wag the dog.
A: Because the tail can not wag the dog.
Old_Slapper
CarAudio.com VIP
I might have. I saw quite a few of their vehicles throughout the late 90's and early 2000's.
That OFC wire sounds better than regular (given the same electrical characteristics).
Buck
5,000+ posts
little alien on campus
Only in, how do you say it, non-loading enclosures will having more excursion or cone area directly lead to more bass. So like IB setup and transmission lines and horns, usually those will more directly be affected by cone area * xmax = Vd, because there's not a loading chamber (closer to free air). But, for example you can have a horn-wall, where there's so much bass inside of vehicle even the line behind the subs start loading more like a ported box and you can get mechanical air support to dump more power in. People do tapped horns too for more cone-loading, that's part of it. Scale matters, but just with a ported box, xmax doesn't really equate to more bass or even lower bass. It can but not always, due to the way energy dumps into a loading chamber.
So like when you follow the path from the rear of the cone towards the exit of the box, to me and my studies, whenever line impedance is greater at mouth than at throat (small mouth big throat), that's when you start getting extra pressure to support the cone inside the entire enclosure as a whole, such as how a tapered t-line is a lot like a ported box, as the area behind the subs is a much larger cross sectional area than the port opening/mouth, where there's a larger restriction/impedance at the mouth that causes chamber loading. When the box gets smaller towards the mouth, it keeps more energy inside, and that matters because you're creating a standing wave.
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I wann hear Rob’s logic to justify pay $1500 for rca cables over good ole twisted shielded rca cables
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Old_Slapper
CarAudio.com VIP
Sorry for the late reply. I just saw this.
More air displacement = more bass felt. not necessarily heard. For example, pro audio subs will rarely have more than 10mm of excursion. Even for the top dogs. However, they still pound like a sub with 30mm of excursion. It's more about surface area than air displacement. I used to DJ in night clubs, and big events, out of San Diego. I tried making a better sub using higher excursion subs and it didn't make a difference. That's when I got into building and designing sound systems for night clubs throughout southern cali.
CertifiedHoodClassic
CarAudio.com Exclusive
it's because the enclosure does work.
in sealed or IB, excursion and cone area is the only source of sound. the more air the speaker moves, the louder it is.
in anything above that though, the enclosure can actually be the source of sound. Excursion of a woofer in a ported enclosure is actually lowest at the port tuning (not including below f3) - and the air movement in the port is very high. The port does the work. That system displaces a lot of air at port tuning, even though the cone moves less. Heard and felt are the same though man, above 30 hz. Or more realistically for pro audio, 35-40 at the lowest. A lot of pro audio woofers peak at like 60 lol. Most songs aren't hitting below 35 with rare exceptions. It's not like low-mid 20's where it's actually more felt than heard.
Those pro woofers sound good because they play from bass (60 hz) up to like 800 hz, high sensitivity, good response. It sounds super snappy and sharp, but it doesn't actually have loud low end (45-50 hz down) output. Main reason is they're designed to just radiate music over a large area (they're pro audio) so they make them efficient and sound good enough, and it's done. Getting loud under 40 hz in an open crowd is probably just impossible. We're in a car though. The air space is nothing compared to where pro audio is normally used. We can make a setup play flat and low no problem with unreal SPL.
I think it's a skill issue homie
Getting a low and loud, high and loud, loud loud, loud loud loud, demo in a car at a car show can happen. Way more powerful than a venue can have
Buck
5,000+ posts
little alien on campus
Another point too is with excursion, the frequency matters, because the duration of polarity is what causes excursion, as in low notes push the cone in and out further, it takes a lot of power at a lot of bass frequencies to push beyond a certain xmax at a lot of frequencies, just like wavelength is inverse to frequency, you have to get pretty low hz before that push is long enough one way to say possibly exceed xmax. A lot of typical music doesn't play that low. I mean like 18mm of xmax I've played hard in the lower and mid 20 hz's before fairly easily, ported box in vehicle. Rooms are much different with how they pressurize, much bigger space, typically use different style woofers. Just saying like you are sort of, one doesn't really always need 35-50mm xmax like some subs have today unless you're trying to contact Godzilla under the sea. Not enough time and power at most frequencies to push a woofer beyond xmax.
Also depends on woofer style. Some woofers will play free air at full power and will never bottom out at rms. Some woofers need a substantial amount of mechanical loading from the box and will bottom out free air on relatively low wattage compared to rms. Woofers that can take full power free air are best for horns and tapped horns, which I see a lot at concerts. You can't do a tapped horn with a lot of woofers we use for car audio in an open room unless you have great cone control built into the enclosure, because the horns don't air cushion the cone enough (they don't load the same way as ported), so the sub a lot of times has to mechanically control itself with limited help from the box. I see a ton of tapped horns used in this application, for dance floor bass, open-air bass.
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