Brand: Audio research
The Audio Research SP-4 is a high-end stereo phono preamplifier designed for vinyl enthusiasts. It features custom-matched transformers, high-quality audio components, and accurate RIAA equalization to ensure that every detail of your vinyl collection is preserved and delivered to your speakers or headphones. The SP-4 also offers adjustable loading, gain, and subsonic filtering, as well as balanced and unbalanced outputs for added versatility. Overall, the SP-4 is a top-tier phono preamp that is known for its exceptional sound quality and craftsmanship.