Originally Posted by rainmanspl
The single tube alone performs extremely well. The amplifier is a true dynamic match for the driver (which is the same sub in the 6014). The power rating is rms and is rated at or below 1%THD. At 4ohms under high volume conditions, it would not be unlikely to see dynamic peaks of 200+wrms at 3-4%THD. (most humans cannot distinguish distortion till it reaches gross amounts of 8-10%) Adding a second tube will give you twice the power and cone area resulting in a 6dB gain. That is where the perception of the need for a second driver is created.
It's like drugs; you always end up needing more for the same result as the first time.
That is the "bottom" line! You can never have enough after you have been bitten by the Car Audio Bug. I do find that Bazooka does seem to always have my fix!