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JCM250 (Single Monoblock)

Name: JCM250 (Single Monoblock)
Brand: Parasound
SKU: PARASOUND-JCM250-SINGLE-MONOBLOCK

Model AJCM250 · Series John Curl

High-performance 250W monoblock with dual-mono design, Class A/AB drive, and ByBee filtering—ideal for demanding speakers and tight spaces.

At a glance

All specifications

Weight: 19.1 kg
Cla: ss A Power Output
IM Distortion: < 0.03 %
TIM: Unmeasurable
DC Trigger Requirements: +9 Vdc to +12 Vdc, 5 mA
Net Weight: 42 lbs (19.1 kg)

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Overview

Compact Power with Deep Musicality

The JCM250 is a high-performance monoblock amplifier designed for listeners who want serious power without excessive size. Whether you’re driving demanding full-range speakers or crafting a powerful home theater front-end, it delivers authority and finesse—even when the music gets intense.

Designed by John Curl, the JCM250 runs high-bias Class A/AB with up to 8 W in pure Class A (High Bias; 4 W in Low Bias) and delivers 250 W into 8 Ω, 450 W into 4 Ω, and 800 W into 2 Ω with 100 A peak current. The circuit is direct-coupled (no capacitors in the audio path) with a JFET input stage and MOSFET driver stage, plus XLR/RCA inputs and loop-outs for effortless bi-amping. Integration is simple with 29 dB / 23 dB gain options, 12 V trigger or audio-sense auto-on, and a 2U chassis that’s easy to rack. Parasound also equips the input stage with Bybee Music Rails™ high-frequency filters.

The Absolute Sound Editors’ Choice 2026 Winner

Read the Editors’ Choice Review

What reviewers say

“…excellent in pitch and rich in harmonics.” — The Absolute Sound (Robert Taylor, Mar 14, 2024).

“Tight, controlled bass with pitch definition. Lifelike, accurate, rich tonality… vocals with exceptional dimensionality.” — The Absolute Sound, Editors’ Choice 2026.

Highlights

Circuitry designed by legendary John Curl
Ultra-high bias Class A/AB operation
Stable with speaker impedance dips below 1Ω
Bybee Music Rails™ - active high frequency filters for input stage
John Curl driver stage employs a cascode circuit for greater open loop bandwidth & superior linearity
Gain switch to select 29 dB or 23 dB gain for optimum compatibility with high gain preamps or extremely efficient speakers
CHK Infinium, custom 5-way speaker binding posts for easy bi-wiring
Neutrik locking XLR balanced input & loop output jacks
Vampire 24k gold-plated RCA input & loop output jacks
Direct-coupled signal path, no capacitors or inductors in the audio path
JFET input stage, MOSFET driver stage
16 beta-matched 15 ampere, 230V, 60 MHz bipolar output transistors
Independent power supplies for input stage & driver stage
Full power is rated all the way down to 2Hz for unrestricted low-end bass
Harris hyper-fast soft-recovery bridge diode rectifiers
REL & Nichicon Muse capacitors
DC servo & relay protection circuits
AC turn-on inrush surge protection with relay bypass
Automatic turn-on by 12 V trigger or audio sensing
2 rack space chassis with rear carry handles
Available in black