Inside the vintage cabinet is a 10 watt integrated solid-state amplifier, and a high quality Blaupunkt 5 1/4" coaxial loudspeaker with a massive ceramic magnet. The cabinet is air-sealed and fiberglass blanketed to create an infinite baffle enclosure. The inset side panel offers bass/treble controls, left and right RCA line inputs (sealed), and two 1/4" jack inputs, hot enough for a microphone or electric guitar. Also included is a Ipod dock/charger, that plugs in directly to the side panel. The cabinet is a vintage Philco Dynamic Tester, from 1946 (thats 63 years ago, see ad below). Known then as a Signal Injector, which is just a small amplifier/speaker combination with an external probe for fixing audio equipment. What is remarkable about this ordinary piece of test gear is the stunning beauty of the cabinet enclosure. Its heavy gauge steel with a beautiful chromed brass front panel imprinted with engine turnings. The bold Philco clear nameplate on top is reverse painted blue and silver. At the center, one large "chicken head" knob controls the volume. The original handle was ugly to me, so I replaced it with a polished aluminum flat handle. The entire cabinet exterior has been stripped and polished to a high reflective shine. The result is highly functional, 'steampunkish' show-stopping retro. The sound is excellent, and can be tailored with the bass/treble controls or the EQ settings on the media player.