I am a bit confised about the quality measuremetn of speakers.

I have bought the following:

Blaupunkt Velocity VX170.4 with the following spec.

40 - 25kHz
50 WRMS
sensitivity 91 dB/2.83 V/m

Also

Boston SL60

45 - 22KHz
80 WRMS
sensitivity 90dB/ 1Watt @ 1 Meter.

I do not profess to know much at all about physics but the Blaupunkt seem to be better on paper (Power not withstanding).

Considering the price of the Bostons (£200 - 300 range) conpared to the Blaupunkt (£60 ish) there is a massive difference.

Can anyopne explain? Is it a label thing or is there a major difference in quality that I just do not appreciate?