Pass Labs First Watt F7

The F7 is designed for efficiency and control, making it an excellent match for high-sensitivity loudspeakers. While it delivers 20 watts into 8 ohms, its unique feedback topology provides exceptional grip, allowing it to drive a wide variety of speakers with precision and clarity.

The F7 uses a clever balance of negative voltage feedback and positive current feedback. This approach allows the amplifier to achieve near-zero output impedance, which results in tighter control over the speaker's movement and a more accurate, refined frequency response.

With 20 watts per channel, the F7 is best suited for medium-sized listening rooms or near-field setups. It is designed for audiophiles who prioritize sonic purity and nuance over sheer volume, so it performs best when paired with speakers that don't require massive power to come alive.

Yes, as a Class A amplifier, the F7 generates a significant amount of heat. It is important to ensure the unit has adequate ventilation and is placed on a sturdy surface with plenty of clearance around the chassis to allow for proper airflow.

This specific two-stage push-pull circuit is chosen for its ability to combine the delicate, musical characteristics of JFETs with the power and stability of MOSFETs. This combination helps the F7 deliver a sound that is both highly detailed and remarkably natural.

The F7 features RCA inputs, so you will need a preamp with single-ended RCA outputs to connect to it. If your preamp only has balanced XLR outputs, you would need to use high-quality RCA adapters or cables to ensure a proper connection.