Originally Posted by basshead81
Rythmik is at the top of my list...I recomend them all the time.
Basshead81 and everyone, my previous post was not aimed at Basshead81 himself, rather it is a post about how to interpret Josh's plots. I hope no one read too much into it. Let us not spoil the fun here
Back to reading charts. There are a lot that one can read from those charts on Data-bass. Other things that people may not read the chart right includes:
1) decay time is inversely proportional to corner frequency. So it is natural that the impulse (or waterfall) decay time of a 20hz extension sub to decay twice as fast as a 10hz extension sub. One can understand the reason just use time scaling.
2) Josh publishes the distortion component chart at the highest SPL level. But normally that is in very little percentage use and it also often includes undesirable effect of amplifier clipping. So a much better picture to show distortion components is something like -5db down from max SPL plot.
3) A lot of DIY subs in data-bass are not equalized to flat so that they are at least comparable to commercial version. That makes distortion plots look better because the lower end is not pushed hard. A curve labeled as 120db may only have 105db output at lower end because of higher roll-off frequency and therefore the amp may not be into clipping. In addition, because the low end roll-off frequency is higher, the impulse response will also be shorter and the waterfall looks cleaner.
These are just some of the things we need to keep in mind when we compare charts from Data-bass.
-Edited by Rythmik - 9/4/13 at 5:32am