It's a mixer! Operation confirmed, no noticeable crackling. Checked using a power adapter from another similar product. [Important Notes] Power adapter is not included. No reverb. [Model Information] The PHONIC AM125 is an analog mixer with 4 microphone/line inputs. Despite its compact design, it delivers professional sound quality. [Connectivity] Equipped with XLR, TRS, and AUX terminals, allowing connection to various devices. Especially suitable for PA systems and recording. [Operability] Level adjustment, high-cut, and low-cut controls are intuitive, making sound quality adjustments easy. - Model: AM125 - Brand: PHONIC - Number of Input Channels: 4 channels - Number of Output Channels: 2 channels - Connection Terminals: XLR, TRS, AUX - Controls: Level, High-cut, Low-cut - Applications: PA mixer, Recording - Power: External power supply As this is a vintage item, please understand that it is a used product before purchasing. No returns or refunds, please.