The Denon AU-300LC is a step-up transformer designed specifically for moving coil (MC) cartridges. It serves to elevate the low output signals of these cartridges to a level that can be effectively amplified and equalized by a phono stage. Crafted with LC-OFC (Linear Crystal Oxygen Free Copper) coil windings that measure 0.4 meters, this transformer aims to maintain the clarity and fidelity of the audio signal. The Denon AU-300LC is compatible with MC cartridges that have an output impedance ranging from 3 to 40 ohms, making it versatile for various high-fidelity applications. The device features a boost ratio of 1:10 and has a frequency response between 20Hz and 50kHz, allowing it to effectively reproduce a broad range of audio frequencies. It utilizes a dual perm alloy construction to achieve a high signal-to-noise (S/N) ratio and is built with an attention to shielding that reduces interference. The small footprint of the transformer, with dimensions of 50mm in width, 37mm in height, and 110mm in depth, and a lightweight design at 0.26kg, makes it practical for integration into existing audio systems. The AU-300LC has received favorable reviews from users, who have noted its clean sound reproduction and effectiveness in boosting audio from low-output cartridges like the Denon DL-103.
