Way back in the 1970s, when I was an undergraduate, I listened to a set of Dahlquist DQ10 speakers at an audio shop near campus. I was ‘blown away’ with the imaging and depth of from the time-alignment of the drivers. I’m still pursuing the imaging that I first heard in these speakers and have come to prefer the ‘life’ of the sound over the sonic accuracy. But living in the dorms, I had neither the space or money for a set and made due with my large Advents.
A few years later I was also impressed by a set of speakers designed by a my electro-acoustics professor at Ga Tech, W. Marshall Leach. He used a 6th order alignment on a ported box (2 poles of the high pass function and 4 in the ported box & driver). Those speakers produced the tightest bass that I’d ever heard to that time.
Specmanship. In the US, by FTC rule, power is supposed to be rated RMS (really average power, there no such things as Root-mean-square [RMS] power) into a declared load and at a declared total harmonic distortion and frequency range. Not required but even better if it is a multichannel amplifier, to be rated with all channels driven.
The chinese products rate gross (and I mean gross, as in unlistenable) power. They’re typically class D amplifiers and can’t sustain that power level across multiple channels or into differing loads (typically a Class A or AB amp’s power will nearly double in a load of 4 ohms, compare to 8 ohms ClassD amps can’t do that. So take the rating on a Fosi or equivalent ClassD amplifier and quarter it or less. That’s the listenable equivalent power into a typical loudspeaker.