Welbourne labs is a parts distributor - and being a parts distributer they want to sell you lots of parts to go in their poor designs. Not only do you pay premium for these parts, but then you have to build the unit. If you think you are getting a bargain - think again. It will generally cost you more $$$ to get something of value with absolutely NO resale value from welbourne then to buy something used which will outperform their units in resale and sound quality. I know from experience. Don't be fooled by these crooks.