OX1.5KM vs OX3KD: Which Amplifier Powers Your System?
By BOSS Audio Systems | Life at Full Volume | Published: 2026-10-23
Category: Comparisons
Compare the BOSS Audio OX1.5KM and OX3KD monoblock amplifiers. Learn which Class A/B or Class D topology fits your car audio setup based on impedance, features, and budget.
Quick Answer
Choose the OX1.5KM for a classic full-range Class A/B sound with 2-ohm stability, or the OX3KD for deeper bass flexibility with 1-ohm stability, subsonic filter, and strapping capability.
Class A/B vs Class D Topology
The OX1.5KM uses a Class A/B design, which delivers full-range audio with a warmer, more linear sound signature. This makes it a strong choice if you value tonal accuracy across frequencies.
The OX3KD employs Class D topology, which is inherently more efficient and runs cooler. It is optimized for subwoofer duty, especially when you need high power output at low impedance.
Impedance Stability and Power Delivery
The OX1.5KM is 2-ohm stable, meaning it can handle a standard subwoofer load without excessive heat buildup. It is a safe bet for most single-voice-coil setups.
The OX3KD is 1-ohm stable, allowing you to wire multiple subwoofers or use a dual-voice-coil driver at its lowest impedance. This unlocks more potential output from your system.
Trade-Offs at a Glance
- Sound Character: OX1.5KM delivers full-range Class A/B warmth; OX3KD focuses on efficient, deep bass via Class D.
- Impedance Flexibility: OX1.5KM is 2Ω stable – simpler wiring for standard loads. OX3KD is 1Ω stable – allows lower-impedance subwoofer configurations.
- Advanced Features: OX3KD adds subsonic filter, phase control, and strapping capability. OX1.5KM keeps it straightforward with essential controls. If you plan to daisy-chain amplifiers or fine-tune subwoofer phase, the OX3KD is the necessary choice.
Product Facts at a Glance
- OX1.5KM: Full-Range, Class A/B, 2Ω Stable, PWM MOSFET Power Supply, Low Pass Filter, Bass Boost, Remote Subwoofer Control, LED Illumination You get a versatile amplifier that can drive both midrange and subwoofer duties with a classic sound, plus convenient remote control for bass adjustments.
OX1.5KM - OX3KD: Class D Topology, 1Ω Stable, PWM MOSFET Power Supply, Low Pass Filter, Subsonic Filter, Bass Boost, Phase Control, Remote Subwoofer Control, Strapping Capable, LED Illumination The strapping capability and 1-ohm stability let you pair two OX3KD units for massive output, while the subsonic filter protects your subwoofer from ultra-low frequencies.
OX3KD
Which One Fits Your System?
Best For
- OX1.5KM: Listeners who want a full-range amplifier with a natural sound and don't need extreme low-impedance loads.
- OX3KD: Bass enthusiasts who run 1-ohm subwoofer setups or plan to strap two amplifiers for maximum output.
Not For
- OX1.5KM: Not ideal if you need 1-ohm stability or advanced subwoofer controls like subsonic filter and phase adjustment.
- OX3KD: Not the best pick if you prefer a full-range amplifier for both midrange and subwoofer duties.
