This is my idea of a moderate size horn. The results are therefore, moderate. If you want all out bass reproduction, then you must construct a larger horn. My bass horn design, DIY bass horn page link below, approaches this concept with zest. A front loaded corner horn, it surpasses the Jensen Imperial, but is much larger.
Life is full of trade offs.
Therefore, for a first horn project, the Jensen Imperial is a gem. This is an excellent publication and should be in every amateur audiophile's library. It's authored by Alexis Badmaieff and Don Davis. Inc. Indianapolis, Indiana 46268. This text is from a gif.