Originally Posted by kmhvball
I just started this thread in the DIY section...
Suggestions for DIY Sub(s) for ~$2,000 'all in cost'
I am not real educated on this, but had seen another one of your posts that talked tuning to 20hz or even 22 hz might be 'better' than tuning down to 14 hz... so, really, looking for kind of a best all around sub woofer plan.
Should I reply here or there? Does it matter?
Porting is a trade off. You gain additional output at "port tune" frequency but you then sacrifice output away from it, particularly below the port tune where your response drops more rapidly than sealed. So what you are doing is you are trading SPL output for frequency response, by raising your port tune you can often get a couple more decibels of SPL output and usually this boost can happen in the exciting parts of the bass region (25hz-60hz) where there is a lot of content in both movies and music. If you crave "loud" then the higher port tune is better. If you want to get kicked in the balls, then port a tad higher IMO. In real life the louder subwoofer is the more impressive one, there isn't much material under 20hz anyways.
The other side of the camp is the guys that don't listen too loud. This might be personal preference, or it might be because of disturbing others. In any event if you won't play it as loud as it goes, then sometimes it might make sense to tune a bit lower and grab that extra ULF (ultra low frequency) extension. You can't really hear below 20hz, but you can feel it at enough volume, so going a little lower lends itself to that infrasonic feeling. Other guys just buy Crowson transducers for that, which is probably more effective anyways.
You can port at 10hz and go way stupid low, or you can port at 30hz and go way stupid loud. Most professional PA and concert level subwoofers (think Metallica show) are horn loaded (even louder than ported) and they are tuned at 35hz or 40hz. They don't care about the 20hz stuff or under, they just need it loud in the exciting parts of the bass region. I think the lowest bass note is 31hz, (6 string bass tuned down half step ) so they don't need response at 15hz, they need tons of volume at 40hz. In these cases they sacrifice the extension down low for output.
No right or wrong answer. Some guys like loud. Some guys like low. Most guys want both. To get both you need to tune low, and then use additional and multiple subwoofers to get the "loud" part. You gain additional output every time you add more subs. That's how you get your cake and you get to eat it too.
In your case with $2000 to work with I'd suggest 4 of the UXL18 drivers in larger ported enclosures tuned to 16hz. You'll have plenty of low and plenty of loud. In comparison to the SVS sub you are considering these will slap it around, steal it's lunch money, and downright embarrass it. That would be a lot of bass. I'm not sure you have heard that much bass in a big space or inside a home before. You can always add more subs again in the future too
Ideally you want to keep all your ported subs tuned the same, because the phase varies at port tune. That's why you should also stick with either all sealed or all ported, because mixing them can be problematic from a calibration standpoint. So you should tune them all the same, it's usually easier to build the exact same thing a second, third or 4th time anyways. If you make sub boxes, do them all at the same time it won't take much longer to make a few more identical cuts. Much easier than building them one at a time.