Helix PR K165.2

Helix PR K165.2 – 6.5″ 2-way premium component speaker system

The HELIX PR K165.2 is a 2-way component kit with a 165 mm (6.5″) woofer and a 25 mm (1″) tweeter from the PURE R-series, which Audiotec Fischer describes as the pinnacle of its PURE speaker range. It is designed for discerning audiophiles who expect sound quality, high-grade materials and a refined look to come together in their vehicle, and it is built to deliver clean, dynamic and detailed reproduction with strong bass and clear highs.

Its key technologies are a coated silk dome tweeter with a neodymium magnet, made to tight manufacturing tolerances, and a woofer with a stiff mica-paper composite cone, a powerful magnet system and a rigid, flow-optimized die-cast aluminum basket with extra ventilation holes. A separable Flex-Crossover with 12 dB slopes and 3-stage tweeter level adjustment completes the set and allows tweeter and woofer to be installed in different locations. The page also stresses high power handling that holds up at demanding volume levels.

Key Features

• Top of the PURE range: part of the PURE R-series, positioned as the highest tier of the PURE speakers.
• Coated silk dome tweeter: 1″ / 25 mm dome for precise, detailed and natural treble.
• Neodymium tweeter magnet: compact tweeter drive with neodymium magnet.
• Flush-mount aluminum housing: anodized aluminum housing with a solid mounting ring for a discreet, concealed tweeter installation.
• Two grille designs: standard grilles and exclusive HELIX grilles are both included and can be swapped.
• Mica-paper composite woofer cone: stiff cone for punchy bass and a balanced midrange.
• Die-cast aluminum basket: rigid, aerodynamically shaped basket supporting precise impulse response.
• Basket ventilation: additional ventilation holes improve voice coil cooling and power handling.
• Powerful magnet system: woofer motor designed for high efficiency and linear magnetic flux.
• Separable Flex-Crossover: can be split for vehicles where tweeters and woofers are mounted in different positions.
• 3-stage tweeter level: adapts the treble to the installation position.
• Optional tweeter pod: an aluminum tweeter pod (PR ATP25) is available separately.

Drivers & Construction

• Included drivers: 2 x PR T25-S tweeters and 2 x PR W165 woofers.
• Tweeter: 25 mm coated silk dome, 25 mm voice coil, neodymium magnet, anodized aluminum flush-mount housing.
• Woofer: 165 mm mica-paper composite cone, 25 mm voice coil with 12 mm winding height, die-cast aluminum basket with ventilation holes, powerful magnet system.
• Grilles: woofer grilles included; tweeters come with two interchangeable grille designs.

Acoustic Performance

• Power handling: 100 W RMS / 200 W max.
• Impedance: 4 Ω (woofer DC resistance Re 3.1 Ω).
• Sensitivity: 91 dB @ 2.83 V / 1 m; 88 dB @ 1 W / 1 m.
• Frequency response: 40 Hz – 25,000 Hz.
• Woofer T/S parameters: Fs 57 Hz, Qms 5.35, Qes 0.63, Qts 0.57, Vas 10.8 l, Cms 440 µm/N, BL 6.1 Tm, Sd 133 cm², Mms 17.9 g, Rms 1.19 kg/s, Xmax ±3 mm.
• Tweeter: impedance 4 Ω, resonance frequency 1,400 Hz.

Crossover

• Type: separate, separable Flex-Crossover (2 units per set).
• Tweeter section: 12 dB highpass with 3-stage level adjustment.
• Woofer section: 12 dB lowpass plus bandstop filter.
• Components: built with high-quality components and extensively fine-tuned slopes.

Installation Notes

• Woofer: outer diameter 166 mm, installation diameter 141 mm, installation depth 66.5 mm.
• Tweeter: outer diameter 37.7 mm, installation diameter 37.7 mm, installation depth 10.6 mm.
• Tweeter mounting: compact design with multiple mounting options; flush-mount aluminum housings and OEM spacers are supplied.
• Crossover dimensions: 121 x 107 x 31.2 mm combined; 62 x 107 x 31.2 mm per separated part.
• Accessory: optional PR ATP25 aluminum tweeter pod.

Technical Specifications

Scope of Delivery

2 x Tweeter PR T25-S
2 x Woofer PR W165
2 x Flex-Crossover
2 x Woofer grille
2 x Tweeter aluminum flush mount housing
2 x Tweeter OEM spacer
2 x Standard tweeter grille
2 x Exclusive HELIX tweeter grille
1 x Mounting material