Parasound NC 2125v2 Stereo Power Amplifier

Clean Power You Can Feel

Drop the NC 2125v2 into your system and the whole presentation tightens up. Voices lock center‑stage, bass gets punchy (not boomy), and big moments hit with the kind of ease that turns casual listening into “just one more track.”

Designed for real‑world rigs, this compact 2U, Class‑AB workhorse delivers 150 W x2 into 8 Ω, 225 W x2 into 4 Ω, and bridges to 400 W mono. It’s THX Ultra2 certified, adds dual A/B speaker outputs with a front‑panel lockout, and is happy with tough loads thanks to 35 A peak current and a high‑current toroidal transformer. Integration is simple: Gold-plated RCA input jacks, 12 V trigger or audio‑sense auto‑on, and a switchable 20/40 Hz high‑pass filter to protect smaller speakers or squeeze more headroom. 

What listeners say

• “…drives my speakers to very loud levels and barely gets warm—amazing amp.”
• “dynamic, precise and detailed”

Specifications:

All Channels Driven: 150W x 2 (8Ω), 225W x 2 (4Ω), 225W x 2(2Ω Load switch set to 2-3Ω)

Bridged Mono: 400W x 1 (8Ω), 400W x 1 (4Ω Load switch set to 2-3Ω)

Current Capacity: 35 amps peak per channel

Frequency Response: 20 Hz - 50 kHz, +0/-3 dB, 1 watt

Dynamic Headroom: 1.3 dB, 0.25% at full rated output, 0.015% at average listening levels

IM Distortion: 0.05 %

Transient IM Distortion: Not measurable

S/N Ratio Rated Output: 114 dB (IHF A-weighted), 106 dB (unweighted)

S/N Ratio 2.828V Output: 93 dB (IHF A-weighted), 84 dB (unweighted)

Input Impedance: 33 kΩ

Input Sensitivity: 1 V in for 28.28 V out

THX standard Inter-Channel Crosstalk: 85 dB @1 kHz, 73 dB @10 kHz, 67 dB @ 20kHz

Damping Factor: Over 150 at 20Hz

12V Trigger Turn On: DC 9 – 12V

15 mA Audio Turn On: Quieter: 1 mV, Louder: 6 mV

AC Power Requirements: 110 - 120 V / 220 -240 V, 50 - 60 Hz
0.5 watts standby
32 watts Idle (no audio)
550 watts full output

Dimensions:
Width: 17.25"
Depth: 14" Chassis Only, 15" Chassis and Speaker Terminals, 16" Deep with cables connected
Height: 4.25" with feet, 3.5" panel only (2U) (437 x 406 x 107mm, 88.2 mm panel only)
Net Weight - 27 lbs (12.3 kg)

Features:

• THX Ultra2 certified
• 150 watts x 2 into 8 Ω (all channels driven)
• 225 watts x 2 into 4 Ω or 2 Ω (all channels driven)
• 400 watts x 1 bridged into 8 Ω or 4 Ω
• 35 amps peak current per channel
• 2 Ohm stable operation with load selector switch
• Two pairs of speaker outputs with front panel A/B buttons
• Rear-mounted lockout switch disables front A/B buttons
• High pass filter, switchable for 20Hz or 40Hz
• Automatic on/off by DC trigger with looping output
• Automatic on/off by audio signal with 2 sensitivity settings
• Fully discrete circuitry with high current toroid transformer
• Bridging switch for stereo or mono operation
• Efficient, low heat design
• DC Servo and relay protection circuits
• Rear-mounted left and right gain controls
• Standby, channel status and high temperature indicators
• Gold-plated RCA input jacks
• Heavy duty 24k gold-plated 5-way speaker terminals
• 115/230v selector on rear panel
• 2U rack mount kit available separately (Model RMK22)