Pure PRK165.2 - Pregnant Helix - Free user manual and instructions

Type	Component Speaker System
Model	Pure PRK165.2
Brand	Helix
Speaker Size	165 mm (6.5 inches)
Impedance	4 Ohms
Power Handling (RMS)	60 Watts
Power Handling (Peak)	120 Watts
Sensitivity	91 dB (2.83V/1m)
Frequency Response	50 Hz - 25 kHz
Magnet Material	Neodymium
Woofer Cone Material	Polypropylene with rubber surround
Tweeter Type	Textile dome, 25 mm (1 inch)
Crossover Type	External 12 dB/octave
Mounting Depth	65 mm
Cutout Diameter	142 mm
Weight (per speaker)	Approx. 0.45 kg
Recommended Amplifier Power	30 - 120 Watts RMS per channel
Protection	Overload, short-circuit, thermal protection
Installation	Car door or custom enclosure, use included mounting hardware
Warranty	2 years
Manual Languages	DE, EN

Frequently Asked Questions - Pure PRK165.2 Helix

What is the recommended amplifier power for the Helix Pure PRK165.2?

The recommended amplifier power is between 30 and 120 Watts RMS per channel for optimal performance.

Can I install these speakers in any car?

The PRK165.2 is a 6.5-inch component system designed for universal fit. Check mounting depth (65 mm) and cutout diameter (142 mm) before installation.

What is the difference between RMS and peak power handling?

RMS (60W) is the continuous power the speaker can handle, while peak (120W) is the maximum short-term burst. Use RMS as the reference for amplifier matching.

Is a crossover included?

Yes, the system includes an external 12 dB/octave crossover to split frequencies between woofer and tweeter.

How do I clean the speakers?

Wipe gently with a dry, soft cloth. Do not use water, solvents, or abrasive cleaners to avoid damaging the cone and surround.

What is the sensitivity rating of the PRK165.2?

Sensitivity is 91 dB (2.83V/1m), meaning it produces decent volume with moderate amplifier power.

Can I use these speakers without an amplifier?

While possible with a head unit, a dedicated amplifier is recommended to fully utilize the speaker's performance and avoid distortion.

Are installation instructions included?

Yes, the package includes a user manual with installation steps, wiring diagram, and safety precautions.

What is the warranty period?

Helix provides a 2-year warranty against manufacturing defects. Keep your purchase receipt.

How do I ensure proper polarity when connecting?

Connect positive (+) to positive and negative (-) to negative. Incorrect polarity causes phase cancellation and poor bass response.

USER MANUAL Pure PRK165.2 Helix

2-way premium component kit

PR K165.2

Product display of a speaker with exposed internal components and fan cover (no text or symbols visible)

User Manual

Bedienungsanleitung

Diagram showing two mechanical components: a cylindrical housing and a dome-shaped component with a downward arrow indicating motion (no text or symbols)

Technical line drawing of a mechanical component with a curved tool inserted, showing internal structure and no text or symbols.

Variante b:

versenkter Einbau

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Variante c:

Exploded view diagram of a mechanical device showing internal components and assembly (no text or labels)

Pure electrical circuit lines without any symbols

Pure electrical circuit lines without any symbols

Close-up of a camera module with visible components and a red box highlighting a section (no readable text or symbols)

Congratulations on your purchase of this high-quality HELIX speaker system.

This system highlights best quality, excellent manufacturing and state-of-the-art sound quality.

Thanks to more than 30 years of experience in research and development of audio products this

speaker system generation sets new standards.

We wish you many hours of enjoyment with your new HELIX speakers.

Yours

AUDIOTEC FISCHER Team

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General instructions

General instructions for installing a HELIX speaker system

To prevent damage to the speakers and possible injury, read this manual carefully and follow all installation instructions. This product has been checked for proper function prior to shipping and is guaranteed against manufacturing defects.

For a proper performance and to ensure full warranty coverage, we strongly recommend to get this product installed by an authorized HELIX dealer. If you choose to perform your own installation read the following information and precautions carefully.

Failure to follow the stated precautions may result in personal injury and / or damage to the audio system or vehicle.

1. Always make sure that the speaker will fit into the intended mounting location and that there is adequate depth for the magnet system.
2. Check for adequate space between speaker and window, window crank, power window mechanism, seat, rear deck torsion bars, and other items which may interfere with the speaker's mounting. This is very important if any hole cutting is required. Detailed size information is indicated in the dimension section of this manual. Take care that the mounting surface is flat and free from all obstructions.

3. Ensure that the loudspeakers are correctly connected (phase), i.e. plus to plus and minus to minus. Exchanging plus and minus may result in significant loss of sound quality.

4. Make sure that the crossovers are mounted properly.

5. Do not mount the speakers and crossovers where water may splash on them.
6. The quality of the installation has a significant effect on the overall performance of the speaker system. Treat each installation step with a high degree of attention.
7. Avoid low frequency cancellation caused by air leakage between the speaker basket and the mounting surface (e.g. mounted on a bended or uneven surface or mounted in an oversized hole).
8. Mounting panel reinforcement may be necessary in some cases in order to ensure a stable, torsion-free and even surface. This can be achieved by mounting the speaker on a metal or wooden sub-baffle behind the body or door panel. Consult an installation specialist for further advices.
9. In most cases you can use the original speaker mounting locations in the doors, body panels or the rear deck. If these are not available you have to prepare your own secure installation place. Due to their structural integrity and accessibility the precut mounting holes should be used whenever possible. Information on a proper mounting can be found in the section "Installation" of this manual.

IMPORTANT: Never cut any metal that is an integral part of an automobile's safety or structural car body.

General instructions for connecting HELIX speaker systems

We strongly recommend that you operate the complete audio system at low volume before final installation. So you can check whether each speaker is working before securing the loudspeakers into their mounting locations.

Make sure that all speaker wiring is fully protected from cutting or wear at sharp edges, which can lead to short circuits that may damage your head unit, amplifier and/or speaker system.

Make sure that all speaker wires are long enough in order to avoid any mechanical stress on the wires or the connectors.

Attention: Ensure that the loudspeakers are correctly connected (phase), i.e. plus to plus and minus to minus. Exchanging plus and minus will result in a significant loss of sound quality.

The positive leads of the loudspeaker system are marked with a white lettering.

Option 2: Connecting the crossovers in vehicles with separate mounting positions of tweeter and woofer, e.g. tweeter in the A-pillar and woofer in the car door.

For further information regarding the connection of the crossovers see section "Connecting the Flex-Crossover" in this manual.

General instructions for connecting the HELIX "Flex-Crossovers"

The crossover of the PR K165.2 component kit offers two configuration options.

Option 1: Connecting the crossovers in vehicles with mounting positions of tweeter and woofer close to each other, e.g. in the car door.

PR W165

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PR T25-S

Without housing With housing for OEM mount With housing for flush mount

Flex-Crossover

Separated installationCommon installation

Tweeter mounting

Option a:

OEM integration

1. Preparing the tweeter

2. Fix the tweeter in original mirror triangle, e.g. with an appropriate adhesive or sealant

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Option b:

flush mount

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Option c:

angled mounting with optionally available mounting pod PR ATP25

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Attention: The OEM spacer is very precise fit and therefore difficult to remove again. Please check carefully before mounting whether this installation pod should be used.

Woofer mounting

Option 1: Mounting positions within close proximity

Connecting the crossovers in vehicles with mounting positions of tweeter and woofer close to each other, e.g. in the car door.

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Option 2: separate mounting positions

Connecting the crossovers in vehicles with separate mounting positions of tweeter and woofer, e.g. tweeter in the A-pillar and woofer in the car door.

1. Press the acrylic covers together with slight pressure and pull them off towards the top.

2. Remove the two jumpers and the 4 screws (red marked). Then fold the circuit board in the middle into two parts.

3. Pull the carrier plate apart to the side.

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Pure electrical circuit lines without any symbols

1. Reinsert the circuit boards in the carrier plate and screw them back in place with the previously loosened screws. Then connect the loudspeakers and signal source.

1. At least, reinstall the acrylic covers. Do not install the circuit boards without the housing. Risk of circuit!

Tweeter level adjustment:

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The crossover allows to optimize the level of the connected tweeter internally by repositioning the tweeter level jumper.

Therefore remove the acrylic cover of the tweeter crossover, pull the jumper straight upwards and reinsert it to the desired position.

0 dB: The tweeter has the optimum level for most applications.

-3 dB: The level of the tweeter is reduced by 3 dB.

-6 dB: The level of the tweeter is reduced by 6 dB.

Warranty Disclaimer

The warranty service is based on the statutory regulations. Defects and damage caused by overload or improper handling are excluded from the warranty service. Any return can only take place following prior consultation, in the original packaging together with a detailed description of the error and a valid proof of purchase. Technical modifications, misprints and errors excepted! For damages on the vehicle and the device, caused by handling errors of the device, we can't assume liability. All HELIX speakers are tagged with a CE-Certification mark. Thereby these devices are certified for the use in vehicles within the European Community (EC).

		PR K165.2
Power handling RMS / Max. P100 / 200 Watts
Frequency response 40 Hz - 25,000 Hz
Impedance Z4 Ω
Sensitivity SPL		91 dB @ 2.83V / 1m88 dB @ 1W / 1m
Outer diameter (more data page 11)	∅Tweeter:	37.70 mm / 1.48"Woofer: 166 mm / 6.54"
Installation diameter (more data page 11)	∅Tweeter:	37.7 mm / 1.48"Woofer: 141 mm / 5.55"
Installation depth (more data page 11)		Tweeter: 10.6 mm / 0.42"Woofer: 66.5 mm / 2.62"
Dimensions crossover		Total: 121 x 107 x 31.2 mm /4.76 x 4.12 x 1.23"Separated (each): 62 x 107 x 31.2 mm /2.44 x 4.12 x 1.23"
Woofer
Impedance Z4 Ω
DC resistance Re 3.1 Ω
Resonance frequency	Fs	57 Hz
Mechanical Q factor	Qms	5.35
Electrical Q factor	Qes	0.63
Total Q factor	Qts	0.57
Compliance	Cms	440 μm/N
Equivalent air volume	Vas	10.8 L
Force factor	B*I	6.1 Tm
Cone area	Sd	133 cm2
Moving mass	Mms	17.9 g
Mechanical resistance	Rms	1.19 kg/s
Voice coil diameter	∅	25 mm
Voice coil winding height		12 mm
Max. linear excursion	Xmax	+/- 3 mm
Tweeter
Impedance Z4 Ω
Resonance frequency	Fs	1400 Hz
Voice coil diameter	∅	25 mm
Features
Tweeter		Coated silk dome, neodymium magnet and aluminum housing with two different grilles
Woofer		Mica-Paper composite cone
Crossover		Tweeter: 12 dB highpass with 3-stage tweeter level adjustmentWoofer: 12 dB lowpass and bandstop filter

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AUDIOTEC

FISCHER