PSP-4IF

The PSP-4IF 4" inside flare reduces the turbulence associated with other vents and port tubes by slowing down the vent air velocity, rendering port noise inaudible. 

The PSP-4IF 4" inside flare is designed to work with the 4" connecting ring (PSP-4RG) when used with the 4" x 12" port tube (PSP-4TB). Finish off your port tube with the 4" outside flare (PSP-4OFH) for even more port noise reduction. You can additionally connect inside and outside flares directly to one another using the connecting ring.

To calculate the proper port length for your cabinet and tuning frequency, use Precision Sound Products' Port Length Calculator.

Dimensions: • Outside diameter: 6-1/4" • Overall length: 3" • Usable length (due to flare): 2-1/2".