This is literally an open box unit. Customer bought it during his house renovation but took a different direction when his AV installer made some changes. Unit has never been used. The RSA-500 has preset equalizer settings for their RW-5802, AW-800-SW and RW-5101-C subwoofers but you can also use it to power up whatever passive subs you have. The lowpass crossover control on the front allows you to tune the LF out to match your speakers so that you can achieve a seamless pairing. Frequency range of the crossover is 40-120 Hz which you just adjust and trust your ears. There is also a volume control where you can adjust the volume level of the LF output. Power output is 300W in 8 ohm and 500W in 4 ohm.
Cosmetically, the unit looks really good. Previous owner didn’t keep the packing box but we will securely pack it for safe shipping. Manual is included.