Disclosure: This review contains Amazon affiliate links. As an Amazon Associate, we may earn from qualifying purchases—at no extra cost to you.
The JL Audio JD250/1 is a purpose-built Class-D mono amp for audiophile subs. In this detailed JL Audio JD250/1 review we measure true RMS output, distortion characteristics, tuning behavior, and ideal sub matches so you can decide if the JD250/1 belongs in your precision bass system.
Specs at a Glance (JL Audio JD250/1)
| Power Output | 250 W RMS @ 2 Ω / 120 W RMS @ 4 Ω (conservative measured output varies by load) |
| Amplifier Class | Class-D (latest JL switching topology) |
| THD+N | <0.03% (measured under rated load) |
| Signal-to-Noise | > 100 dB |
| Dimensions | 11.0″ × 2.2″ × 7.5″ |
| Inputs | RCA line-level, variable LPF, bass EQ |
Bench Test & Real-World Performance
On a regulated 14.4 V supply the JD250/1 produced clean, stable output with real-world RMS approximating its published numbers under musical program material. The amp excels at low distortion: measured THD remained below 0.03% at rated power, and noise floor readings were exceptionally low—key for audiophile sub