Broad compatibility with common dual op-amps used in audio - Supports many dual op-amps for audio circuits including LM833, LM4562, 4558, 5532, 4556, LF353, OP275, AD712, AD827, AD746, AD797, OPA2604, OPA627 to Dual, OPA637 to Dual, AD797 on Dual, AD843. Replacement or upgrade to dual or double packages such as AD847 is supported. OPA627 based design for versatile amplification - The OPA627 op-amp is used in this board and employs field effect input mode. It is suitable for front and rear amplifier stages, output buffers, voltage amplifiers, and headphone amplifiers. Sound and performance characteristics - The sound is warm with a wide sound field. The audio quality is delicate, soft and graceful, with detailed highs and strong overall texture. Appearance and build - The adapter board features gold-plated pins. OPA627AU SMD Single Operational Amplifier Exquisite Adapter Board with Fully Gold Plated Pins. Practical use scenarios - Upgrade the front-end or buffer stage in a DIY preamp, DAC, or headphone amp by swapping in this adapter board with OPA627. - Use as a high-quality voltage or output buffer in amplification chains to improve drive and tonal balance. - Replace aging dual op-amps in hobbyist audio projects to achieve a warmer, more natural sound with enhanced detail.