Slam possible with Tubes instead of SS ??

FWIW Sound Labs have a high impedance at low frequencies which is why tube amps are preferred if you want them to play bass right. You can get them to play bass with transistors, but I think you will find that the way to do that involves having the speaker too close to the rear wall so you get some reinforcement. The problem is you wind up with a one-note bass.

The high impedance we are talking about is enough that a 600-watt transistor amp will only make 75-150 watts at certain bass frequencies. Sound Labs like some power though, so you really need about 150-200 watts to really make them play.

Santa says Slam. Slam Slam.

Larger or multiple drivers optimally driven by the right matching amp is always the key to "slam".

Larger rooms will require more, so room size and acoustics to some extent ( I call this the "listening environment") is another key factor.

Best bass slam I ever heard was the GR Audio open baffle 12" high eff co-ax w dual powered on-bard subs (ss on the subs, 18 wpc tube amp on the co-ax) @ RMAF 2009. So the answer is....maybe??????

The official sensitivity rating for the Snell C/V is 90db @ 1 meter with 2.83vrms. Nominal impedance 8 ohms, minimum 5 ohms.