Howdy bass chums.. I have an older Goliath II Jr cab that has had the tubes from the rear circular ports removed long before I got the thing.. It has a pair of 300w EVM 10's in it that punch the dookie out of the mids, but the low-lows are somewhat deficient; I'm assuming in some part due to the missing port tubes. Can one of yiz take a tape measure and see how deep those tubes are plizz? many thanks..