Hi I have an old stereo system that my dad gave me when I was young (maybe 8 years ago). I'm trying to find out how good (or bad) of a stereo I have. I must admit that I think it's pretty powerful, but still not powerful enough for me when I go crazy. The amplifier was made in 1977 I think. So anyway here it goes, I listed everything I could find on the front and back: Technics SU-Z2 "Stereo Integrated Amplifier" Power Source: AC 60Hz 120V 275VA 230W Main OR Remote: 4-16 ohm / each speaker Main AND Remote: 8-16 ohm / each speaker - Bass/Treble control: -10dB to 10dB each, in 2db increments - Subsonic Filter: 30Hz (-6dB/oct) - High Filter: 7kHz (-6dB/oct) Realistic 31-2000A "Wide Range Stereo Frequency Equalizer" Input: 60hz 120V 15W - Analog controls: -12dB to +12dB for 31Hz, 62Hz, 125Hz, 250Hz, 400Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz And here are the speakers: Technics SB-L70 3 Way Speaker System Impedance 8ohm Input: 90W, Music; 60W, DIN - Simple ported - 10" sub, 4" mid, 2.5" tweeter What does "DIN" means for the speakers? I'm also trying to figure out how many watts the amplifier is.