[quote name='Bill Fitzmaurice' post='413057' date='Feb 18 2009, 01:56 PM']Only to the matter of sizing them to the same width for stacking. A 1x15 and 2x10 truly engineered to work together does not and never has existed.
Driver displacement and cabinet size requirements increase exponentially as frequency goes down, so while a 1x15/4x10 is a favorite combination the ratio is backwards; a well engineered system would run two to four 15s with one 10. A proper match for one 15 is one eight, or six. 'Matched sets' is a purely cosmetic matter, proper audio engineering is not a consideration.[/quote]
Although 'technically' I am sure you are correct, they (Trace at least) do seem to work just fine with a 1x15 and a 2x10.
(To my ears)....