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I have a pair of B&O CX50 speakers. The woofer has been replaced with one of these The speakers have a great mid/hi, but the bass is very, very dull. Now I was wondering if adding bass reflex port would do it any good, and if so, what Fb to tune for to get a feel of some better lows?

The internal size of the cabinet is around 3,4 Liters. I was thinking about a 2,5cm bass port. I did some calculations using this spread sheet but I don't know if I'm off?

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My experience with acoustics is very limited so any advice is highly appreciated before I start drilling holes in my old vintage speakers.

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    Home hifi is off-topic here, sorry. However, from your graph, everything except leaving it closed will make it sound worse. You really don't want a hump at 120Hz. That aside, tuning a port is not a case of drilling a hole & hoping.
    – Tetsujin
    Sep 20 at 7:43

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