Усилители мощности стерео — Parasound NC 2125v2

The Parasound NC 2125v2 is a NewClassic two-channel amplifier, built as a compact 2U Class-AB design. THX Ultra2 certification applies. It costs USD 1,250, and the warranty on parts and labor lasts two years.

Key specs that matter

Rated with two channels loaded, output is 150 W per channel into 8 ohms and 225 W into 4 ohms. Bridged into 8 ohms, the amplifier delivers 400 W as a mono unit. A high-current toroidal transformer supports 35 A peak current per channel. Frequency response is 20 Hz to 50 kHz at plus 0 and minus 3 dB measured at 1 W. Dynamic headroom is 1.3 dB, and IM distortion is 0.05%. Damping factor exceeds 150 at 20 Hz, while signal-to-noise is rated at 114 dB IHF A-weighted. Input sensitivity is 1 V for 28.28 V at the output, and input impedance is 33 kilohm.

Engineering and use context

The chassis measures 438 mm wide, 108 mm tall and 406 mm deep including cables, and weighs 12.3 kg. It fits a 2U rack space, with a rack kit sold separately. Mains input can be set for 110 to 120 V or 220 to 240 V at 50 to 60 Hz. Power consumption is 0.5 W in standby, 32 W at idle and 550 W at full output. A switchable high-pass filter at 20 Hz or 40 Hz is provided, which Parasound describes as a way to protect smaller speakers. Left and right gain controls are mounted at the rear, and indicator lights show standby, channel status and high temperature. Fully discrete circuits are guarded by a DC servo and relay protection. Two sets of speaker outputs, A and B, are chosen with front-panel buttons, and a lockout function stops those front-panel settings from being changed.

Pairing

Line-level signals arrive through gold-plated RCA input jacks, and a stereo RCA loop output feeds a further amplifier. Speaker cables attach to heavy-duty 24k gold-plated 5-way terminals. It can switch itself on and off through a DC trigger with a looping output, or by sensing an incoming audio signal with two sensitivity settings, which lets it follow a preamplifier, AV receiver or processor automatically. The A and B outputs let one amplifier feed two pairs of speakers, for example in two rooms, and bridged mode turns a single chassis into one mono channel for a larger load.

Alternatives

The Parasound NC 2250v2 is a 3U NewClassic stereo amplifier rated at 275 W per channel into 8 ohms and 750 W in bridged mono.