Pioneer ampAll working except no sound at all from Left channel A - other 3 work fine NO returns Warehouse reference:Blue 0893 Returns Policy:All of our items, unless otherwise specified, are covered by a 30 day warranty. If you choose to return an item because youve changed your mind or no longer want the product, please open a return request specifying this and you will have to pay for the return postage fee. Please note, an incorrect purchase will also result in the buyer paying for the return postage fee. If an item arrives faulty or damaged, please open a return request specifying this and we will pay for the return postage fee. Please note that it is the buyers responsibility to return the item in the same condition it was received in, therefore if an item arrives back damaged due to poor packaging, you may not receive a full refund.