The Kenwood SP-820 matches the R-820 and TS-820S. The SP-820 has selectable tone filters to attenuate high and/or low frequencies. Plus you can select between two audio input sources. The ¼ inch headphone jack on the front panel is post-filtration. It features a 4.75 inch 8 ohm speaker. Frequency response is 100 to 5000 Hz. The rear panel has three RCA phono jacks for: Inputs A and B and Line Output. 6.25 x 6 x 13.4 inches.