Uploaded June 2019 | Updated September 2026, 3 weeks ago

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In this exclusive video with the engineers of JBL, we learn about how and why speakers have that "hole" in the box, or the bass reflex port and why JBL engineers believe it's super important to not block it.

Get your own JBL speakers in the form of the

LSR 305 MKII
amazon.com/JBL-305PMKII-Powered-Studio-Monitor/dp/B077N2GQXC/ref=as_li_ss_tl?keywords=jbl+305&qid=1560819690&s=gateway&sr=8-1-spons&psc=1&linkCode=sl1&tag=bojoeyy00-20&linkId=9b58c6ea5b3f9fff0979ecba2a252aba&language=en_US

LSR 306 MKII

amazon.com/JBL-Professional-Monitor-Speaker-306PMKII/dp/B0787KRJ9H/ref=as_li_ss_tl?keywords=jbl+306&qid=1560819908&s=gateway&sr=8-2&linkCode=sl1&tag=bojoeyy00-20&linkId=473c94aff21d371f18cdb85376d81032&language=en_US

LSR 308 MKII

amazon.com/JBL-Professional-Monitor-Speaker-308PMKII/dp/B077NHM2K6/ref=as_li_ss_tl?keywords=jbl+308&qid=1560819937&s=gateway&sr=8-2&linkCode=sl1&tag=bojoeyy00-20&linkId=81b7e7669c4a64fa6b8371ea3c5f3cca&language=en_US

1 Series 104
amazon.com/JBL-Professional-Reference-Monitors-JBL104/dp/B07MHQZV62/ref=as_li_ss_tl?keywords=jbl+104&qid=1560819965&s=gateway&sr=8-1-spons&psc=1&linkCode=sl1&tag=bojoeyy00-20&linkId=3b301153f6100ecd5cb8fc80564db0ea&language=en_US

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