Originally Posted by basshead81 I keep hearing this linear response thing....most ID subs have linear responses at normal moderate levels.
When performing cea-2010 max burst testing the SVS manages to maintain its response by using heavy limiting and dsp. That does not necessarily mean its better then other designs because when pushing the sub near its limits the dynamics are squashed. Meaning, the sub limiter kicks in at 105db and the sub is being ran at 103db, but there is peaks in the source content that call for 108db. All of that source content above 105db is lost. Take a sub that is not heavily limited and a good portion of that source content can be played back. That is why several companies allow the FR to bend when reaching thier true limits.
Now if neither sub is played below its limits then there is no advantage either way as both designs play flat and handle all source content the same. So that pretty much negates the whole "linear" response sales pitch.
Note that deepat04 didn't say the SB12 was more linear than other ID subs. He stated he bought it for its linear response in comparison to the BIC PL-200 and Epik Empire, which are definitely not as linear. You might be choosing to fight where there was none
Still, linear is a relative thing. The LFM-1 EX
(two ports open), Epik Empire,
and PSA XV15
each have basic responses that are a little less linear than the SB12-NSD
. And here is the Rythmik FV15HP
. Very linear up to 80hz, and then rolls off in comparison to the SB12 about that (which might matter to deepat04 with his 150hz crossover). Maybe there is an argument to be made that the difference is not important, but there is a difference.
As for the heavy limiter, it's a performance value choice, much like how auto makers put rev limiters on engines. Certainly there are those people who hot rod their vehicles that would like to squeeze out that extra bit of performance out of their cars, but it's advantageous to the car makers not to have the engine damaged while under warranty, which potentially keeps costs down for consumers (note that SVS offers a 5 year warranty). And the average consumer who doesn't care about squeezing out that extra bit is probably better off protected from accidentally damaging their engine/sub. So maybe a drawback to you; maybe a benefit to others
Originally Posted by flickhtguru
Also remember most of those freq resp measurements are done OUTSIDE. Once you put the sub in a room everything about the subs freq resp changes according to the room its in.
Also the freq resp graph of a sub can change in the same room depending on where the sub is placed and where the MLP is located. Then if you get into dual, triple, or quad subs things can change even more.
Agreed. But just to point out that does not discount the value of a sub with an anechoic linear response. A sub with an anechoic non linear response could exacerbate peaks or nulls due to room interaction. So unless one knows (through measurements) how the sub's response will interact with the room, a sub with a linear response can be the better/safer choice.