Denon AVR-X4100W 7.2 AV Receiver with Dolby Atmos (Certified Refurbished) This Certified Refurbished product is tested & certified to look and work likenew. The product includes all original accessories, and is backed by a 1 year warranty. The AVRX4100W can recognize and remember up to 8 Bluetooth portable devices, so your family and friends can enjoy their favorite tracks. With each channel rated at 125 watts (8 ohms, 20Hz  20 kHz, THD 0.08%, 2ch driven), the AVRX4100W features a power amplifier design that incorporates multiple high current discrete output devices, with identical circuit topology on all 7 channels. . The ultra high resolution filters are applied to all channels including the two independent subwoofers, with the most obvious benefit being heard in the low frequency range where correction is needed the most The AVRX4100W has the processing power to run a more enveloping, Audyssey MultEQ XT32 calibrated 7 or 9 channel Dolby Atmos layout using 5.1.2, 5.1.4* or 7.1.2* configurations utilizing ceiling mounted, or Dolby Atmosenabled speakers.