Originally Posted by Mupi
What I meant was that the relative SPL/distortion is always going to be there between low 20's and low 30's when you use a cheap sub. By the time you hit audible levels at the low 20's, the low 30's may have gone over the reference level? If you want to listen only to the low 20's then it is ok
That is what I already said. You just cant get the same low end extension just by using multiple cheap subs as you can get with a more expensive sub. Otherwise companies like JTR, SVS etc will have to pack up and leave.
Sure you can buy multiple Ford Escapes for the price of a Ferrari but Ford Escape is no Ferrari.
Untrue. Distortion rises in a ported design when
a) The driver is being pushed to it's xmax and beyond, mechanical and heat related issues
b) When notes are being played close to or below the tuning point, causing port noise (air velocity at the port)
c) when the amp is being asked to produce too much power for too long.
All of these issues are minimal/undetectable at certain SPL and manifest at higher SPL's. So if you're able to cut down the workload of each sub/amp to 25% of what it was being asked of before, you aren't going to observe meaningful distortion. And with EQ, you can trade some unneeded headroom for bass extension.
Companies like JTR, Seaton, Rythmik etc won't be losing business because
-People take pride in owning quality products. People with a $2000 budget for a subwoofer probably aren't looking to buy a bunch of cheap Polk subs.
-Most People don't want a subwoofer in every corner
-Most people don't want to go the DIY route
I used multiple cheap subs to get extension down to 10hz (in room). Each was tuned for 15hz, and with some EQ Im -3db @ 10hz. It's not a far stretch to assume that a sub with 24hz tuning could get down into the high teens if you had 4 of them and some EQ boost. The downside, 4 subs in a room! 4 sets of wires going all over etc etc. In my setup I now have these two goofy columns taking up floor space, and I don't have much choice as to where to put them. Luckily the spots I can fit them give a fairly good frequency response.