multicomp PRO Stereo Line-Level Amplifier 0–15dB Gain

The multicomp PRO Stereo Line-Level Amplifier is a compact LM833N-based preamp that delivers up to 15dB of clean, low-noise gain for restoring and boosting line-level signals.

If a weak output, long cable run, or mismatched source level is sapping clarity from your audio chain, this small stereo booster gives you controlled gain without adding hiss or coloring. Built around the LM833N op amp, it’s designed to sit between source and amplifier — or before a recorder — to raise playback or feed levels to the correct operating range. The unit is bus-powered by the included 12V DC adapter and features RCA I/O for easy integration with consumer and semi-pro equipment.

How will this amplifier improve sound across long cable runs?

The amplifier compensates for level loss caused by cable capacitance and device mismatches by providing up to 15dB of adjustable gain. Because the design emphasizes a low noise floor, you regain level without introducing noticeable background hiss. It’s most effective when placed near the source or at the receiving end of the run, depending on your system layout.

• Gain range: 0 to 15dB adjustable for precise leveling
• Low-noise LM833N op amp for minimal hiss
• RCA inputs and outputs for standard line-level connection
• Use at either cable origin or destination to correct loss

Can I use this with consumer and semi-pro gear like CD players, DACs, and mixers?

Yes — the amplifier’s input impedance and RCA connectors match typical consumer and semi-pro line-level equipment. With a 47K ohm input impedance and 100K ohm output impedance, it won’t heavily load sources while providing a strong drive to downstream devices. The flat frequency response across 20Hz–20kHz keeps tonal balance intact.

• Input impedance: 47K Ohms — friendly for most line outputs
• Output impedance: 100K Ohms — suitable for most inputs
• Frequency response: 20Hz–20kHz for neutral audio reproduction
• RCA female connectors for widespread compatibility

How do I set up and adjust gain for optimal performance?

Connect the unit between your source and destination using the RCA jacks, and power it with the included 12V DC adapter. Start with the gain near zero, then increase until you reach the desired level without clipping; because the control is continuous up to 15dB, you can fine-tune for clarity. Monitor levels at the destination device to avoid overload.

• Power: 12V DC adapter included for immediate use
• Adjust gain slowly while monitoring destination levels
• Recommended starting point: 0dB, then increase until optimal loudness
• Compact 4.29" x 2.87" x 1.69" chassis for easy placement

Will this unit change the character of my audio?

The amplifier is engineered for transparent gain correction rather than tonal alteration. Its flat response across the audible band and high-quality op amp topology aim to preserve the original signal character while raising level. Any perceived change should be limited to improved presence and reduced noise relative to a low-level source.

• Flat frequency response keeps tonal balance true
• LM833N op amp minimizes coloration and distortion
• Designed for level correction, not tone shaping

Who is this for: audio hobbyists, home studio operators, AV installers, and anyone needing to correct low line-level signals or offset level loss over long cables. If you want a simple, plug-and-play solution to raise line signals without complex routing or processor setups, the multicomp PRO Stereo Line-Level Amplifier provides a compact, quiet, and adjustable boost that fits into consumer and semi-pro systems.