Yes, I think that Jmcgrogan2 nailed it. I personally do not use the word synergy (it's a bad word in my vocubulary) but use 'impedance matching' instead but the undelying principal is the same. Electrically the amplifier must be able to drive the speaker it's being connected. And, if the speaker is too capacitative (for example) then the amp must be stable & not break out into oscillations (which is often manifested as harsh/brittle sound), if the speaker is a low impedance load in the bass area then the amp must have sufficient current delivery.
Like Jmcgrogan2 wrote the speaker cables & pre-power cables also make some difference in the sonics.
It's entirely possible that the amp-speaker interface was just fine your case but it could have been the cables or some electronics upstream? Debugging this is a hard & time consuming job but if you do go down the debugging path you end up learning a lot about what makes your rig tick & that is always worth the effort. The easiest thing to do is to dump the amp....
Anyway, the amp-speaker interface has to be considered very seriously esp. for 99% of the speakers in the market that continue to be ill-designed.
Like Jmcgrogan2 wrote the speaker cables & pre-power cables also make some difference in the sonics.
It's entirely possible that the amp-speaker interface was just fine your case but it could have been the cables or some electronics upstream? Debugging this is a hard & time consuming job but if you do go down the debugging path you end up learning a lot about what makes your rig tick & that is always worth the effort. The easiest thing to do is to dump the amp....
Anyway, the amp-speaker interface has to be considered very seriously esp. for 99% of the speakers in the market that continue to be ill-designed.