Precision Power MAS.524 – 5.25" 4-Ohm Motorcycle Speakers

What's Inside the MAS.524

The cone is UV-resistant polypropylene, co-moulded with a low-density Santoprene surround through a chemical bonding process – not mechanical joining. Polypropylene is impermeable: road spray, humidity, and condensation do not affect its acoustic properties or structural integrity. Santoprene holds its compliance across the temperature extremes a fairing or Tour-Pak pod creates – from cold morning starts to sustained summer heat – without the degradation that affects foam surrounds over time. On the road: the speaker's acoustic behaviour in rain or summer heat is the same as on a dry winter morning. No compliance shift, no cone sag – consistent response across the seasons.

The 1.25" (31.75mm) oxygen-free copper voice coil is wound on a thermally absorbent aluminium former. Aluminium conducts heat away from the voice coil windings faster than paper or Kapton – transferring it to the air gap and basket, where it can dissipate. In an amplified build, the speaker is receiving more power and generating more heat than in a factory-radio system. The neodymium motor delivers a high magnetic flux density in a low-mass package – the field strength needed for 92 dB sensitivity without the bulk and weight of a ferrite motor. On the road: at sustained amplified volume in an enclosed fairing on a hot day, the aluminium former keeps voice coil temperature in check – maintaining consistent power handling and output across long riding sessions.

The tweeter is a 1" titanium dome – rigid, low-mass, and thermally stable. Titanium moves quickly and accurately at high frequencies without the breakup modes that limit softer dome materials. It resists UV degradation, moisture, and temperature cycling better than fabric domes – which soften in the heat and exposure of a motorcycle fairing over time. An integrated 6dB high-pass crossover rolls off low frequencies before they reach the tweeter, protecting it from excursion damage at the higher output levels an amplified build delivers. On the road: the titanium dome handles the power levels an amplified build puts into it and maintains its acoustic character through weather and seasons. The clarity you hear on the first amplified ride is the clarity you get three summers later.

The glass fibre-reinforced ABS basket provides the structural rigidity to handle vibration transmitted through the fairing and Tour-Pak pod directly into the speaker frame – keeping the motor and cone assembly aligned across extended high-volume riding.

Sensitivity and Impedance

At 92 dB (1W/1m), the MAS.524 converts amplifier power to acoustic output efficiently. In an amplified build, sensitivity and amplifier output work together: a higher-sensitivity speaker produces more volume from the same watt than a lower-sensitivity alternative. The 4Ω impedance is the design operating point for most external motorcycle amplifiers in stereo – it provides the correct load for the amplifier's output stage and gives better thermal margin than a 2Ω load at the same power level.

4Ω – What It Means for Your System

External amplifiers are designed around an output impedance that their output stage drives efficiently and safely. Most quality motorcycle amplifiers are rated at both 4Ω and 2Ω in stereo, and for a minimum 4Ω speaker load in bridged mode. The 4Ω stereo operating point produces less heat and draws less current from the electrical system than 2Ω – giving the amplifier more thermal headroom for sustained operation. In bridged mode, a 4Ω speaker is the minimum rated load for the bridged configuration – across a bridged channel pair, each channel effectively works into 2Ω, the safe lower limit that keeps the amplifier out of thermal protection under sustained use. Running a 2Ω speaker in bridged mode would put each channel at about 1Ω – below the rating of most amplifiers. The MAS.524 is the correct fairing speaker for any bridged-amp configuration. For factory-radio builds, see the MAS.522 (2Ω).

Fitment

The MAS.524 drops straight into factory 5.25" speaker mounting positions on Harley-Davidson Touring models – no modification or adapters required. Confirm your fairing pod accepts a 5.25" driver before ordering; some Touring models use 6.5" fairing positions.

Technical Specifications

In the Box

• Precision Power MAS.524 5.25" 4Ω coaxial speakers – pair