improve bass fbt with rcf l18p200n

Goodmorning everyone,
I have 2 80's speakers from FBT, it's the Europe l1200
RCF L18p200n woofer + RCF n980 driver
yes, you got it right, a 2-way with 18 woofer
the sound is fantastic, vintage as I like it but the bass is few
the case is about 110 liters with two 150mm holes without tubes
simulating with bassbox I noticed that they aimed at the peak of 80hz sacrificing everything that comes first.
can anyone tell me if i can improve the bass by working only on the reflex ports?
 
Yes, you can lower the tuning by elongating the ports. You'll typically loose output in the 80 - 150 Hz area, which is the lower kick drum, which the hearing is more sensitive to than the deeper bass. The lower you tune the ports, the more pronounced the difference will be.

Because the volume of the cabinet is quite small and the extra port length subtracts from this internal volume even further you'll likely get a very gradual response. Anything that's more than 10 dB down is probably not worth pursuing.

You can simulate this in bass box, just subtract about 3.5 liter for every 10 cm increase in port length.
 
yellow = original, no tubes
orange = 100mm tubes
azure = 500mm tubes
 

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crossover I presume is 700-900hz I haven't found exact information
green= original
red = tubes 27cm with volume calculation reduced to 100 liters
 

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