Custom built box according to specs. for this model subwoofer for maximum performance! I do not have an AMP or wiring to let you test it so you will need to have those things in order to test it. CASH ONLY FIRM on $! The top of the box has two cuss words FYI You can pick it up or I can meet you within reasonable distance but only on a commitment to buy item. You can also call four 0 five eight 0 one twenty three 0 six Kandice