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A bit ago, I was chatting with Matt and this topic was hit on a bit. It also seems to be an active topic in a couple other threads. I thought I'd bring about the question here and see if we can get an interesting discussion, and hopefully measurements on this topic.
The thought game is this: If you take the new Fusion-6, Tux-1099, and Sentinel and calibrate them all to 75db pink noise and EQ to a flat response, and then do an impulse response with each of these (100 Hz to 250 hz) at +20 db, how would they compare? By impulse, I mean something like gun fire or bass drum: loud, and quick in transient..the thump in your chest midbass. In theory, you may say that if they all have the exact same frequency response, and are all calibrated to play the same intensity, they should sound identical....but they won't.
In practice, how does Bl and thermal compression through VC heating come in to play? If you send a +20 db signal to each of those speakers, what do you actually get (this is where measurements, not theory come in to play. I don't have the means to do so, but one of you may). Vd is not the same for all the woofers, and the smaller ones need more travel, extending further down the Bl curve where efficiency drops. Likewise, thermal non-linearities in the coil will suppress excursion.
...how much midbass punch would each of these woofers lose to these effects? If you put in +20 db, does the sentinel produce +19 db, the tux-1099 produce +17 and the karma-6 produce +15? (I made those numbers up).
/discuss
The thought game is this: If you take the new Fusion-6, Tux-1099, and Sentinel and calibrate them all to 75db pink noise and EQ to a flat response, and then do an impulse response with each of these (100 Hz to 250 hz) at +20 db, how would they compare? By impulse, I mean something like gun fire or bass drum: loud, and quick in transient..the thump in your chest midbass. In theory, you may say that if they all have the exact same frequency response, and are all calibrated to play the same intensity, they should sound identical....but they won't.
In practice, how does Bl and thermal compression through VC heating come in to play? If you send a +20 db signal to each of those speakers, what do you actually get (this is where measurements, not theory come in to play. I don't have the means to do so, but one of you may). Vd is not the same for all the woofers, and the smaller ones need more travel, extending further down the Bl curve where efficiency drops. Likewise, thermal non-linearities in the coil will suppress excursion.
...how much midbass punch would each of these woofers lose to these effects? If you put in +20 db, does the sentinel produce +19 db, the tux-1099 produce +17 and the karma-6 produce +15? (I made those numbers up).
/discuss