Quote Originally Posted by cradeldorf View Post
yep I like the Onken alignment. It's a very open airy the people are standing right in my living room talking type of sound.
Well, it's not an Onken alignment, just looks like one at a glance. Based on your remarks, you would find a true Onken or Jensen Ultraflex alignment way too 'punchy'/'boomy'.

Yours is ~aperiodic, i.e. is somewhat resistively loaded due to having very high aspect ratio slot vents. You can get the same result with a regular reflex by stretching cloth of the right porosity over it ['click' test]. Yours are also next to cab wall boundaries, so are acoustically fairly long vents which combined results in a slower roll-off [better transient response] to a lower Fb than the smaller reflex vent. Pushing them up close to the wall further lowers effective vent length, so my SWAG is that yours are effectively an EBS alignment.

Bottom line, a very good venting choice when speakers are located near/at a wall or corner, though sealed or very low tuned [< 20 Hz] EBS alignments tend to be best overall for corners.

GM