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Plinius SB-301 Amplifier

The Plinius SB 301 is the best built amplifier we have ever seen here at Choice Audio.  It is a solid, meaty component, capable of stunning Class A or Class A/B performance. The SB-301 is a Class A/B two channel amplifier that delivers over 300 watts per channel at 8 ohms.

For the not so technically minded, that means it’s a really good stable amplifier unit, particularly with speakers that demand a lot of power to drive bass without distortion, or treble with detail and finesse. This amp can handle inefficient speakers. The standing temperature is lower than that encountered in Class A series designs because it’s a Class A/B design. If there is not a lot of room in your component cabinet, temperature is an important factor to consider. The 301 has a standby mode that keeps the amplifier cool when not being played.

The Plinius 301 occupies an audio system niche that is perfect for the audiophile that really loves big, dynamic sound when listening to movies, orchestral pieces and, of course, just playing music loud.

The physical construction of the SB-301 is based on the SA series design, so it has the same distinctive aesthetic as the Class A products and, indeed, much of the electronic topology is derived from that Class A history.

The 301 stereo amplifier delivers all the dynamics, finesse and transparency that Plinius is renowned for. Like all Plinius products, it is reliable and will rise to the challenge of difficult operating conditions time and again.

Choice Audio is Minnesota’s exclusive Plinius dealer


310 watts RMS per channel into 8 ohms.
470 watts RMS per channel into 4 ohms.
Both channels driven from 20Hz to 20kHz at less than 0.2% total harmonic distortion

Frequency Response:
20Hz to 20kHz ±0.2dB
-3dB at 70kHz

Typically <0.05% THD at rated power 0.1% THD and IM worst case prior to clipping Current Output:
100A short duration peak per channel
Fuse protected

Phase Response:
+0° at 20Hz and -14° 20kHz

Hum & Noise:
100dB below rated output 20Hz to 20kHz, A-weighted

Input Impedance:
47k ohms

RCA Inputs: 32dB
Balanced Inputs: 38dB

Power/Current Consumption:
1.6A (370W) Class AB Idle
0.2A (46W) Standby


Height: 220mm (8 3/4 “)
Width: 500mm (19 3/4″)
Depth: 455mm (18″)

Weight: 38kg (83lb)

Colors:  Silver or Black