Line Magnetic LM-300IA 300B Integrated Amplifier

The Line Magnetic LM-300IA is a single-ended integrated amplifier in pure Class A with 300B output tubes and 2×10 watts of output power.

Why the LM-300IA?

Among tube lovers, the 300B is considered one of the most musical output tubes there is. The LM-300IA runs it in pure Class A, can also be used as a pure power amp thanks to a subwoofer output, and brings along a piece of tube tradition with 274B rectifier tubes.

What you hear

Ten watts sounds like little, but with the right speakers it isn't: Class A 300B delivers fine resolution and a warm, organic tone that makes many solid-state amplifiers look old-fashioned.

Who is the LM-300IA for? (and who it isn't)

For listeners with highly efficient speakers – horn or full-range systems – in moderately sized rooms. Straight talk: with normal speakers at around 85 dB sensitivity in a large living room, 10 watts gets tight – check your speakers' sensitivity beforehand, we're happy to help.

Our verdict

An amplifier for connoisseurs who know what a few, but good, watts are enough for.

Technical specifications

• Circuit design: tube integrated amplifier, single-ended, pure Class A
• Output power: 2× 10 W
• Tube complement: 2× 300B, 2× 12AT7, 1× 6SL7, 2× 274B (rectifier)
• Frequency response: 20 Hz – 50 kHz (-1.5 dB)
• THD: 2% (1 kHz)
• Signal-to-noise ratio: 87 dB
• Input sensitivity: 200 mV
• Input impedance: 100 kΩ
• Speaker outputs: 4 Ω / 8 Ω / 16 Ω
• Subwoofer output: yes
• Inputs: 3× RCA (line)
• Dimensions (W×H×D): 430 × 217 × 365 mm
• Weight: 34 kg

Frequently asked questions

Is the LM-300IA enough for normal speakers?

We recommend it without reservation only for high sensitivity from about 90 dB upward. At lower sensitivity, we'd rather advise you toward a more suitable model.

Can I use the LM-300IA as a pure power amp?

Yes, using an external preamp and the corresponding input, it can also be run as a power amp.

Does the LM-300IA have a subwoofer output?

Yes, a dedicated output for an active subwoofer is provided.

Does the LM-300IA have a headphone output?

No.

Why buy the LM-300IA at HD Zürisee?

We check together with you whether your speakers match the LM-300IA's low wattage needs – honestly, even if the answer is sometimes a different model.

Pairs well with

You'll find high-sensitivity models in our speaker collection – ask us specifically about horn or full-range speakers.