[Arny Krueger]

" Frank" wrote in message

There is no new technology. I had the Bose 901 II with 9
-4.5 inch drivers in a small
box, with a low frequency -3 db of 30 Hz. It was boosted
+18 dB at 30 Hz.

The original 901 required a huge amount of power and it
was new technology and concept when it came out.

High price of trying to get bass out of a small box.

There
wasn't too many amps in its day that could drive it loud.

Tubes. Ugh.

On the other hand, back in the 60s, there was
Electro-Voice 30" woofer that required very power to
drive it,

Its voice coil could handle only about 60 watts. It only had a few mm of
Xmax. A modern 10' subwoofer driver could probably out-displace it.

and when coupled to the right box, it could
blow a match out about five feet in front of it.

Nope.