RE audio

[b@d @pple]

What is tuning a box too high, and tuning too low?

And how am I wrong about a 5x7 sounding like a 5x7, and a 10 sounding like a ten? You might have misinterpreted my previous post. When I put a 12'' sub in my car, it is going to sound like a 12'' sub. It will vary in spl and frequency response depending on it's enclosure. We could honestly bring physics into the equation to show that a woofer is doing the same amount of work, no matter what enclosure it is in.

Most people think ported is way louder than sealed. In reality, if you took the average SPL through a range of frequencies, 20hz-80hz, sealed might be louder in that case. Ported boxes usually contain a strong peak which cause most listeners to think of as louder.

I have been into this shit for about two years. I guess that means you're more than 5 times more experienced and knowledgeable than I am, right? That being said, I am not trying to say I am "smarter" than you or anything, I am just not sure why we have to justify out knowledge through "x" amount of years.

what is tuning a box too high or too low?..well its relative depending on the woofer..if you send 1000 watts to a woofer in a ported enclosure tuned at 30 hertz,some woofers might not perform the way they would at 38 hertz,or 45 hertz..every woofer has their own footprint and an enclosure where they are the most efficient and perform the greatest..you could have a port volume that is too large or too small(port tune) and make your woofer completely useless..im not saying that every box,every size,every port is "wrong" for every sub..im simply saying each woofer has a box or a port that they perform the absolute best in.any wrong calculation in box size or port length or overall port volume can make or "break" a woofer physically or audibly

[audiowiz]

To expand, All subs have a natural Frequency at which they are most efficient. If a port is tuned above that frequency (too short) or below that frequency (too long) it wont be as effecient as tuning the port to that woofer's optimal tuning frequency.

As far as port area (size of opening), this is tuned to the box not the woofer (in most cases). Generally, optimal port area should be calculated (roughly) at 15-16 sq inches for each cubic foot of net box volume. Some woofers can vary a bit from these numbers, but generally, when using this formula you get a tuned ported box that has a wide frequency response from high pass cutoff to low pass rolloff.

When a ported box is tuned properly, it is ALWAYS louder than a sealed box. That said, the comment about across frequency range the summed SPL of a sealed box would be technically louder, which is great, but show me one competition series that rates SPL across the frequency range. The Ported boxes that beat hard at one frequency and then suck on the rest are the prefab, Best buy special boxes. these are made to pound at (give or take) 40hz, which is where most hip hop songs play. A truly tuned ported box with the right matched sub or subs will beat across any USEABLE frequency range (30hz- about 50-60 hz). Not trying to argue with anyone, just throwing out some facts.

As far as Bad Apples work, dude does sick shit. Thats coming from another Shop owner with 15+ years experience in the industry.

Colin
AW