If the specs are correct, 104db SPL at 1 meter for the JBL L8 and 102db SPL at 1 meter for the Teufel Boomster XL, you can expect the AIWA EXOS-9 to be no louder than the JBL L8 in my test, as Oluv has shown in his videos that the Teufel Boomster XL already outperforms the EXOS-9. So, both Beoplay A8 and Bose Sounddock 10 seem to be the better choice if volume is important. Regarding sound quality at medium volume, I prefer Beoplay A8 and JBL L8 over the Sounddock 10, and the Boomster XL would probably be an excellent solution, too, but a terribly heavy one.

Maybe I'll do another maximum volume behind-door comparison once again between Sounddock 10 and HK Lucas Nano 300.