I have a bass speaker a JBL 140 E.

An enclosure has been designed for me that I am suspicious of. The cabinet measures: 16" deep X 23" tall X 20"wide

The vent was created at the bottom of the cabinet by shortening the height of the speaker mount to create a 1" X 20" space. The is no other reinforcement for the vent, just a simple space.

The speaker is out for repair, so I am unable to test it. Do you think this is a sound design?
Did my speaker design do the job?
Thanks,

Ken