actually we do have some real world testing with SPL numbers. 
These are the emax testing that we did with our drivers. These SPL numbers are done with a termlab mic, on the dash in the proper sanctioned location. The boxes used are our spec boxes. All spec vented boxes are tuned to 30hz with exception of the 9kv2 which is tuned to 32hz. 
All box sizes used can be seen on the website.
Vented results:
Results - Average In-Car SPL
9Kv.2 - 10 - 100Hz - 120.56dB
11Kv.2 - 10 - 100Hz - 121.14dB
11Ov.2 - 10 - 100Hz - 122.34dB
13Kv.2 - 10 - 100Hz - 123.85dB
13Ov.2 - 10 - 100Hz - 126.04dB
16Kv.2 - 10 - 100Hz - 123.92dB
16Ov.2 - 10 - 100Hz - 130.15dB
Results - Peak In-Car SPL
9Kv.2 - 10 - 100Hz - 134dB @ 52Hz
11Kv.2 - 10 - 100Hz - 136.3 @ 52Hz
11Ov.2 - 10 - 100Hz - 137.9 @ 48Hz
13Kv.2 - 10 - 100Hz - 140.1 @ 50Hz
13Ov.2 - 10 - 100Hz - 141.9 @ 54Hz
16Kv.2 - 10 - 100Hz - 142.5 @ 48Hz
16Ov.2 - 10 - 100Hz - 145.00 @ 54Hz
Sealed Results:
Results - Average In-Car SPL
9Kv.2 Avg SPL - .25cF Sealed Box - 118.66dB
11Kv.2 Avg SPL - .50cF Sealed Box - 120.62dB
13Kv.2 Avg SPL - 1.0cF Sealed Box - 123.59dB
16Kv.2 Avg SPL - 1.6cF Sealed Box - 127.20dB
11Ov.2 Avg SPL - .50cF Sealed Box - 122.21dB
13Ov.2 Avg SPL - 1.0cF Sealed Box - 126.16dB
16Ov.2 Avg SPL - 1.6cF Sealed Box - 130.23dB - LOUD -
Results - Peak In-Car SPL
9Kv.2 Max SPL - .25cF Sealed Box - 133.2dB @ 55Hz
11Kv.2 Max SPL - .50cF Sealed Box - 134.0dB @ 55Hz
13Kv.2 Max SPL - 1.0cF Sealed Box - 136.6dB @ 55Hz
16Kv.2 Max SPL - 1.6cF Sealed Box - 140.4dB @ 54Hz
11Ov.2 Max SPL - .50cF Sealed Box - 135.1dB @ 55Hz
13Ov.2 Max SPL - 1.0cF Sealed Box - 139.6dB @ 55Hz
16Ov.2 Max SPL - 1.6cF Sealed Box - 143.5dB @ 55Hz
19Ov.2 wasnt tested for average and peak SPL as we get rid of the test vehicle before we had a chance to get some numbers. 
Can you put up higher numbers? HELL yes you can. 
We have a customer putting up 148.9 on an AC-190 with 2 11ov2s and a nine.1 in a high tuned vented enclosure.
The kv2 and ov2 drivers and made to be efficient. They dont need much power and get pretty loud. 
For those of you looking to dump 1000 watts or more on a driver other than the 16ov2 or 19ov2, we are looking to have our 13av2 released hopefully by Christmas or a little after. 
As for the pricing we offer. This explains it all:
http://www.edesignaudio.com/edv2/elementaldesigns_FAQ.php
We make up profit in sheer volume, if we can pass a savings on to our customers, we do. Take the edi 6500s for example. Started at $350. 2 Years later and you can have them for $185 with the forum discount.
Hope this helps a little bit. 
Elemental Designs
Performance.Mobile.Audio. 
alexl@edesignaudio.com
Warehouse Manager