1. EQ-800 is 5.1home theatre. It is very magnificent and elegant model. 2. The other cabinets are made of aluminum alloy except the subwoofer cabinet is made of MDF. Their structure is tight and strong. The stand of the front speaker is glass. Their surface finish may be painted oxidation. You could choose any color as you like. 3. Some parts of speaker imported from Taiwan. It has very good sound effect and very good quality. Especially the high frequency driver unit, it looks like the eyes of cat, not easy to be damaged, long lifetime. 4. The cabinet body is very slender and light, it can save more sea freight, because one container can load more quantity. 5. The active subwoofer has built-in amplifier, FM/AM, adjustment of BASS/TREBLE and full function control. 6. The range of frequency (from 40 to 20k Hz) is very wide, so you could enjoy very rich sound effect. When it plays, the high frequency will be very clear and the low frequency will be very powerful, deep and strong, while the middle frequency is very abundant.