Sound output confirmed. Channel switching is also possible, which is convenient. There is some minor crackling, but no significant crackling is felt at present. Notes: Please understand that this is a used item and is being sold as-is before bidding. The auction includes only what is shown in the photos. Please refrain from bidding if you are looking for a perfect condition item or are overly sensitive. We are not responsible for damage caused by shipping accidents. Please perform maintenance as needed. We may cancel bids if we determine that the transaction cannot be conducted properly, such as with bidders who have poor feedback. No claims, no returns, please.