The Listening Window is a spatial average of the nine amplitude responses in the ±10º vertical and ±30º horizontal angular range.

A fantastic player nonetheless, designed to become the sole digital source for every modern audiophile, thanks to its wide array of inputs/outputs, high-end ESS Sabre DAC, a dual THX-AAA chipset and an uncompromised streaming experience, thanks to the Android OS. However, note: the 2nd test low frequency limit at 80Hz is a “brick wall” and doesn’t quite emulate a standard filter of 12 or 24dB/octave. Double-diffused S-shaped Porting Tube - The innovative double-diffused S-shaped porting tube enhances bass extension and control, resulting in fast bass transients and superior bass quality.The video below has more discussion with respect to the technical merits and subjective notes I had during my listening sessions.

in aspect, they are tiny little things that might as well be lead weights that you can curl and work out with when you are bored but, don’t do that. You can experience an exhilarating sound unmatched in its class thanks to the SP3 power supply’s astounding 100W of output. You can also download various bass extensions if you use Google Chrome and want to run the SP3 as your PC monitor for audio. Low resonance frequency and high current carrying capacity have always been the goals of those designing high fidelity audio products.

woofer to act efficiently and to allow the SP3 to deliver its full potential, FiiO engineers have developed a system of external and internal asymmetrical magnetic circuits. That means they are meant to be close to the listener on a desk and not placed somewhere else distant in the room.

The R7’s back plate also sports coaxial in and out, TOSLINK in and out and an Ethernet input; and it tells us that the unit’s amplification is THX-788+ certified.

This encompasses those listeners who sit within a typical home theater audience, as well as those who disregard the normal rules when listening alone. This is a small volume speaker with a tiny mid-woofer so you have to understand that it can't produce real bass, just harmonics.