I am baffled by the need to construct a baffle in a diecast tender.
I have installed "Fat Boy" type speakers in more than ten diecast tenders using the tender shell as the baffle.
In most cases, I have tried to reduce the size of openings in the tender floor to minimize back wave interference. But I don't think that this is necessary. I get a huge improvement without the baffle.
Most speaker designs call for enclosure volume to increase base performance.
I submit that by using the entire volume of the tender shell you get as much or better base response than using a smaller baffle and you make more room for electronics.
This is not the case in plastic shell diesels or enclosures that have a large "vent." There a baffle on the rear of the speaker or long tube on the front of the speaker may be required.
