The sound samples have been recorded in two different ways: 1) Microphone very close to the speakers: More noise, but it's easy to compare how the different models sound under the best conditions. The noise is from the recording equipment, the cabinets themselves does not contribute to the noise. Cabinets with a wider frequency range can of course reproduce higher frequency noise.
2) Microphone approximately 2 meters away from the cabinet. Less noise, but the room acoustics come into play, which makes all recordings sound duller than the ones with the microphone close by. It makes it easier recording with/without tweeter. These samples are still recorded with the microphone in line or close to in line with the speakers, so the better dispersion of the 6"-equipped models can't really be heard. When a better room for recording is available, there will also be sound samples recorded off axis.
= 2m, without tweeter = 2m, with tweeter (no attenuation) = Close
Sound pressure level comparison:
To compare how loud the cabinets are, here's a comparison chart. The 1x-row compares the volume with a constant amount of power, as an example: 100W, regardless of the cabinet nominal impedance. The samples on the 2x-row are increased 3dB to show the volume gain when using a solid state amplifier that puts out about twice the power @4Ω compared to 8Ω. Going from a single S112 cabinet to a 2xS112 or a S212 with such an amplifier gives a significant boost to volume/available headroom.