Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Pyle Bass Tube--weak and unreliable

I purchased this product from Amazon, I was very disappointed in this product. When I recieved it it did not work at all. I made all the necessary connections an it would never power up. I will say however Amazon is very commited to customer satisfaction, they gave me no problems returning this item for a full refund at no shipping cost to me.