Originally Posted by ObsceneJesster
Its a known fact sealed subs are more accurate and more musical than their ported counterparts. Its nothing new.
A known fact huh? And you've done a level matched, frequency response matched, placement optimized comparision to prove this? Because Dr. Floyd Toole has, and he found no audible differences between the two properly set up. And I have a feeling Dr. Floyd Toole knows a lot more about sound quality than yourself.
The whole purpose of sealed subs is to deliver tight accurate bass.
And to reradiate excess rear energy back through the cone
If this wasnt the case then why bother with them?
How about the fact that they're smaller - about half to quarter the internal volume of a well designed helmholtz or transmission line?
You will rarely see anyone who wants their music to sound tight and accurate use a ported sub.
Factoring in that high output subs can have some port compression and a passive radiator (which 99.99999% serves exactly the same function as a port), here's some examples:
Jim Salk's Songsub is a helmholtz radiator: http://www.salksound.com/songsub%20o...%20pricing.htm
Here's a helmholtz sub reviewed by stereophilehttp://www.stereophile.com/content/r...bwoofer-page-3
Here's a transmission line (not quite a helmholtz resonance, but it does have tuned openings through which bass radiates) main speaker, used full range to monitor, in some of the top mastering studios in the world, including the ever-discriminating BBC:http://www.pmc-speakers.com/keyclien...ient&key_id=21
Ports have their limitations, but subjective "sound quality" isn't one of them when well designed and well integrated into a system.
I didn't make the rules.
You just failed to comprehend
what they entail...
You have to decide which trade off your willing to make. In the $1000 range, they is no such thing as a perfect sub.
have to learn what the actual tradeoffs are
, before running your mouth.
I pulled this from Audioholics and this is exactly why some subs had trouble keeping up with the movie. Sorry folks but you $500 sub cant do everything perfect.
Where did anyone say anything about a $500 sub. I thought you were comparing sealed vs ported. A sealed $500 sub will likely just electronically remove 60% of the bass information in this movie...
It is generally accepted that an optimized sealed enclosure exhibits the best transient response characteristics.
Generally accepted =/= correct. First of all you have to factor in that any advantage your sub might have in a vacuum, is totally done away with once placed into a real room with real reflections and standing waves. This includes transient response. HOw many times do you think the sound wave bounces back and forth in your room before your ear finally processes it?
Second, there's the crossover. Your crossover introduces more group delay (transient response) than a vent does. And the vent introduces it around 20hz, where wavelengths are very long and our sensitivity is very low. The crossover does this all the way up at 80hz, where more musical content exists, the wavelengths are smaller, and our ear's sensitivity is higher.
Does your system have a crossover?
Third, there's a matter of perception. How much group delay (transient response) can YOU perceive? It's a lot lower than you'd imagine, compared to the perception of flat frequency response, which is magnitudes higher on the pecking chart.
fourth there's a matter of thermal compression. Sealed subs require significantly more power, and EQ to have flat response (assuming you want flat response, not punchy sealed sub response). That creates heat, which creates nonlinearities in drivfer performance, which reduces sound quality.
fifth there's the problem that spring loading creates - reradiated bass. UNless you've got advanced servo mechanism at play, most commercial sealed subs have too high QTC and too much reradiation of sound energy, which is not good for transient response. The spring effect is NOT a desirable effect, contrary to popular belief, it actually harms sound quality. The only advantage of the air spring is that it prevents max excursion and protects drivers. There's a reason why many people will tell you that infinite baffles have the best bass they've heard.
sixth there's a matter of excursion. a sealed sub needs around three times the excursion to reproduce deep bass that a vented sub does. Unless you've got some ridiculously linear high excursion high surface area driver, or you're using like eight fifteens, a sealed sub will simply have too much cone motion to have truly accurate sound quality. At the $500 price class, few drivers employ correctly placed shorting rings and motor structures to handle the excursion requirements of sealed, and instead those subs just roll off everything below 35hz electronically. It's measurable:http://www.audioholics.com/reviews/s...2-measurements
It was once generally accepted that the world was flat, too. And that the sun revolved around the earth.
The control provided by the air-spring in a good sealed system contribute to generally outstanding transient behavior
The control of the airspring, or do you mean the distortion created from underdamping leading to a "punchy" sound coloration?