It's like everything in life. While one may work perfectly fine, two are better. On the other hand, in audio, it may not be true. It depends on WHAT ONE or WHAT TWO you are considering purchasing. Obviously one Mark Levinson will be better than two Rotels. What will you be hooking them up to? $300.00 bookshelf speakers or $12000.00 floor standers? What is your aim? Ultimate fidelity in the ultimate system or less? I think you should buy what you can afford and then a little bit more. The only mistakes I have made in this hobby occurred when I got cheap and did not get what I wanted.