I have built about twenty pairs of speakers over 30 years, from folded corner horns to hemi-spherical satellites to transmission line towers, using KEF, Peerless, Vifa, Altec-Lansing, Electrovoice, Radio Shack, Phillips brands of drivers. No, you cannot surpass the quality of what any decent speaker manufacturer can produce in their factory. Yes, you can make pretty good speakers at a fraction of the cost, if you enjoy woodworking and tinkering. You can spend a lot of time and a fair amount of money to gain a lot of satisfaction at having made something yourself. Try a standard kit from Madisound or North Creek before attempting your own design. The more you read before you start, the better off you'll be.
