The "hole" on the front of the Subwoofer/Receiver unit is actually the subwoofer port. This port provides more bass frequency extension for the subwoofer driver, which is on the rear of this unit.
The features of the Pioneer HTS-570 Home Theater System include:
1. A fully functional 5.1 Channel AV Receiver with Dolby Digital, DTS, and Dolby Pro LogicII decoding.
2. The AV receiver features 25 watts-per-channel RMS output (4 ohm speaker load) x 5 with 1% THD (Total Harmonic Distortion).
3. Amplifier System and input connections on Subwoofer enclosure; separate LED display and control unit.
4. All speakers are supplied: L/R Mains, Center, L/R surrounds, and a 30 watt RMS Powered Subwoofer. The impedance for the satellite speakers is 4 ohms, rather than the customary 8 ohms.
5. Room Audio Calibration via Auto MCACC (Multi-Channel Acoustic Calibration System) with Microphone
6. AM/FM stereo tuner with a total of 30 presets
7. Cables and speaker wire provided - all wires are color coded for easy connection.
8. Wireless remote control
9. Illustrated User Manual
For further details on each sectionm, including information on the rear panel connections, proceed to the next photos...

