Parasound NewClassic 2125 v.2 Two-Channel Power Amplifier - Black

THX-Certified Power, Built for the Long Haul

The Parasound NewClassic 2125 v.2 delivers 150 watts per channel into 8 ohms. That climbs to 225 watts into 4 ohms.

Bridge it to mono and it puts out 400 watts into a single speaker. That's serious headroom for a demanding center channel or a stubborn pair of towers.

A high-current toroidal transformer backs up that power with 35 amps of peak current per channel. The amp stays stable down to a 2-ohm load, well below what many speakers ever demand.

THX Ultra2 certification means Parasound tested it against strict benchmarks for power, distortion, and crosstalk. Fully discrete circuitry, rather than an integrated chip, handles the amplification itself.

Frequency response stretches from 20Hz to 50kHz. That's a wider window than most music or movie soundtracks actually use, giving the amp room to spare.

Protection and Flexibility Built In

DC servo and relay protection circuits guard your speakers and the amp itself. IM distortion measures just 0.05%, and signal-to-noise ratio reaches 114dB, IHF A-weighted.

A switchable high-pass filter, set at 20Hz or 40Hz, can relieve the amp and your speakers of bass duties you'd rather send to a subwoofer.

The 2125 v.2 turns on automatically. It responds to a 12V trigger signal or simply senses an incoming audio signal on its own.

Dual sets of gold-plated speaker terminals support A/B speaker switching, with a front-panel lockout to prevent accidental changes. At 27 pounds, it fits a 2U rack space, with an optional rack-mount kit sold separately.

A damping factor above 150 at 20Hz gives it firm control over woofer movement. That translates to tighter, more controlled bass instead of a loose, boomy low end.

Who Is This Amplifier Best For?

• Home theater owners driving power-hungry front or center channels. THX Ultra2 certification confirms it can handle demanding surround content.
• Two-channel listeners who want clean power without excess. Fully discrete circuitry and low distortion keep the signal honest.
• Anyone running speakers with a dip below 4 ohms. The 2125 v.2 stays stable down to 2 ohms.
• Owners of a rack-mounted or multi-room system. Automatic on/off and 2U sizing make it easy to integrate.
• Not the right fit if you need a built-in DAC or streaming. This is a dedicated power amp; you'll need a separate preamp or processor as a source.

How Does It Connect to Your System?

Gold-plated RCA inputs accept a line-level signal from a preamp, receiver, or processor. A loop-out RCA lets you pass that same signal to another amplifier.

Connect speakers to either set of gold-plated five-way binding posts, and use the front panel to switch between them. For bridged mono operation, follow Parasound's wiring instructions to combine both channels into one high-power output.

A 12V trigger input lets it power on and off with the rest of your system automatically, so you're not reaching for a separate switch. It runs on either 110-120V or 220-240V power, switchable for use outside the US.

Pairs Well With

Building your system? Here are some great companions for the Parasound NewClassic 2125 v.2:

• Preamplifiers to feed it a clean line-level signal
• Floorstanding speakers that can make use of its power reserves
• Speaker cables to connect to its gold-plated binding posts
• Interconnect cables to run from your preamp's RCA outputs
• Audio racks sized for its 2U rack-mount profile

Frequently Asked Questions

What does THX Ultra2 certification actually mean?

It means the amplifier passed THX's own testing for power output, distortion, and channel separation. It's an independent benchmark, not just a marketing label.

Can it be bridged to mono for a subwoofer or center channel?

Yes. Bridged mono operation delivers 400 watts into a single 8 or 4-ohm load, following the wiring steps in the owner's manual.

Does it need a separate remote or app to control it?

No. It's designed to turn on automatically, either from a 12V trigger or by sensing an incoming audio signal, so day-to-day use needs no remote at all.

Can it be rack-mounted?

Yes, in a standard 2U rack space. Parasound sells a rack-mount kit separately for anyone building a rack-based system.

What's the warranty?

Parasound covers the NewClassic 2125 v.2 for two years, parts and labor.

See It in Action

OldTrades walks through the 2125 v.2's features and sound in a full review:

OldTrades also unboxes the amp, showing what's in the box and its build up close:

Why Audio Advisor?

• 40+ Years of Expertise — Since 1981, we’ve helped over a million music lovers find the right gear.
• 60-Day Money-Back Guarantee — Take your time. Listen, enjoy, and make sure it’s right for you.
• Real Experts, Real Help — Our team is here to answer your questions at 800-942-0220, weekdays 9am–6pm EST.
• Free Shipping — On orders over $49, delivered to your door.
• Flexible Payment Options — Financing available so you can start listening now.

Learn More

Want to learn more about matching a power amp to your speakers, THX certification, or building a rack-mounted system? Visit our Learning Center for guides, tips, and expert advice.