part-no. - Jehnert Sound Design

JEHNERT 

Sound 

D E S I G N 

Inst.Instr.part-no 65125/31/FH07/03 

Installation instructions 

part-no. 65125 / 

65131 (P-MHT) 

Production Jehnert Sound of Design 

Car-Audio-Systems 

development and 

production of 

Porsche Car-Audio-Systems 

Str. 15 

70794 Filderstadt 

Heinrich-Hertz-Str. 11 

Tel. 00 49 71 58 / 9 56 99-0 

70794 Filderstadt 

Fax 00 49 71 58 / 9 56 99-10 

e-mail: sounddesign@jehnert.de 

Tel.0049-711-77 97 87-87 

www.jehnert.com 

Fax: 0049-711-77 78 921 

e-mail: sounddesign@jehnert.de 

www.jehnert.com 

»Exclusive-Edition« 

Porsche Boxster / 996 Coupé / convertible 

Porsche 986 Boxster / 996 Coupé/Convertible

C o n t e n t s 

page 

Packing list. ......................................................................... 2 

1. Disassembly of the door lining .............................................. 3 

2. Removal of the Tweeter-midrange-module / bass tank ............... 4 

3. Installation Loudspeaker cables / Tweeter-midrange-module...... 5 

4. Cut-outs in door lining........................................................... 6 

5. Insulation / Installation of the door lining........................... .... 7 

6. Panel alignment/ reference points........................................... 8 

7. Panel installation/ fastening ................................................... 9 

8. Crossover circuit - Speaker connection.................................... 10 

Loudspeaker wiring diagram......... ........................................ 11 

9. Installation of the speakers - grill............. ............................. 12 

Technical information........................................................... 13 

Service / fault diagnoses......................................................... 14 

Guarantee ........................................................................... 15 

Please follow the installation instructions 

“step by step” 

and check the package contents. 

Particularly important notes contain the following remarks: 

 

65125 / 131 Porsche Boxster / 996 - 1 - © JEHNERT SOUND DESIGN

p a c k i n g l i s t 6 5 1 2 5 / 6 5 1 3 1 

p a c k i n g l i s t 6 5 1 2 5 / 6 5 1 3 1 

packing unit 

Check list 

door panel, covered (right/left) with metal-grill 

2 

packing unit 

Check list 

Tweeter 26 mm 2 

(each mounted with 4 x 8 hex screw plus oblong hole) 

Midrange door panel, 100 covered mm 2 

(each (right/left) mounted with four metal-grill M4 x 16 screws) 

tweeter-midrange Tweeter 26 mm (each module mounted with 4 acoustics x 8 hex screw fabrics plus oblong grill 

2 

hole) 

installation Midrange 100 kit mm incl. (each template 2 

mounted with (right/left) four M4 x 16 screws) 

Subwoofer tweeter-midrange 160 mm module 

4 

(each mounted with on acoustics the panel fabrics with two grill metric screws) 2 

crossover installation (right kit / incl. left) template (right/left) 

2 

Subwoofer 160 mm 4 

Hardware bag: (each mounted on the panel with two metric screws) 

crossover (right / left) 

flat head screws, M 4 x 30 

Hardware flat head bag: screws, M 4 x 40 

2 

flat head screws, 30 

2 

flat head screws, M 4 x 50 

Spax flat head screws, screws, 4,2 x M 60, 4 x black 40 

42 

Spax flat head screws, screws, 4,2 x M 70, 4 x black 

2 

50 

Hex-nut Spax screws, M 4 4,2 x 60, black 

64 

Spax screws, 4,2 x 70, black 

2 

Sheet metal nut 4,2mm 

6 

Hex-nut M 4 

washer Ø 20mm 6 

(f.metric screws) 

Sheet metal nut 3,9 4,2mm 

6 

flat head screws, M4 x 20 (for woofer) 

8 

washer Ø 20mm 6 

(f.metric screws) 

Porsche flat head Signet screws, M4 x 20 (for woofer) 

28 

2 

Preassembled hardware: 


Preassembled hardware: 

The product was carefully packed and checked for its completeness. If you find anything missing. 

damaged or defective, please notice our guarantee services on the back of these assembly instructions. 


8 

8 

The product was carefully packed and checked for its completeness. If you find anything missing. 

damaged or defective, please notice our guarantee services on the back of these assembly instructions. 

65125 / 131 Porsche Boxster / 996 - 2 - © JEHNERT SOUND DESIGN 


1. Disassembly of the door lining 

A 

C 

B 

E 

D 

F 

Disassembly of the door lining with 

or without Porsche soundpackage 

is identically. 

1.1. Roll down window completely. 

1.2. Lever off the mirror triangle panel ( A) starting from the bottom edge and pull it off 

upward. 

1.3. Carefully push the faceplate of the door latch lever (B), out from the catch starting 

from the tapered side and pull away upward: 

open door latch and remove the multipoint head cap screw underneath. 

1.4. Remove screw (C) on upper end of door handle. 

1.5. Open lid of door tray and remove the plastic expansion screw (D) 

1.6. Pull off faceplate ring (E) from the handle and remove the Toxy screw underneath. 

1.7. Unclip the airbag faceplate (F). Remove the Phillips screws underneath. 

1.8. Pull door handle 

forward and off: 

C 

D 

E 

1.9. Carefully squeeze the door panel away from the plastic clips at the lower and 

lateral edges (danger of breaking!). 

1.10. Lift the door panel out of the sealing above and simultaneously move it 

horizontally and forward away from the inner door metal. 

1.11. Unhook door lock Bowden pull wire and unplug power cable for the 

entrance light. 


2 . Removal of the Tweeter-Midrange-Module in the instrument panel / 

vehicles with Porsche sound package: bass tank in the doors 

Instrument panel: 

2.1. Removal of the original installed Tweeter-Midrange-Module: 

Dismount both original Tweeter-Midrange-Modules from the instrumentpanel 

and unplug the cables. Retrain the screws for later assembly. 

(The standard tweeter module and connector will not be needed anymore.) 

 

Car doors: 

Only for vehicles with installed Porsche sound package: 

2.2. Removal of bass tank: 

2.2.1. Disconnect all original loudspeaker plugs (A). 

(They will not be needed anymore.) 

2.2.2. Loosen the four screws (B) that hold the bass tank and remove ist. 

(It will not be needed anymore.) 

(B) 

(A) 


3. Installation of loudspeaker cables/Tweeter-Midrange-Module 

3.1. Loudspeaker cable into the doors and to the instrument panel 

3.1.1. Carefully pull off the moisture protection foil. 

In vehicles with installed sound package there is no moisture protection 

foil behind the bass tank. Important! (see point 3.1.4.) 

3.1.2. Installation of loudspeaker cable: 

• Lead one speaker cable into the door : 

through original compact connector; open it and make sure it is 

absolutely sealed again. 

• Lead two speaker cables to the Tweeter-Midrange-Module in the 

instrument panel. (Crossover circuit is installed behind the middle console.) 

3.1.3. Reinstall moisture protection foil to fit precisely. 

3.1.4. Only for vehicles with Porsche sound package: 

For protection against moisture and damage to the loudspeakers through 

 

humidity: use adhesive spray or tape to attach a normal plastic foil/bag 

sized to the opening of the bass tank on the car door. 

Vehicles with Porsche sound package: 

under all circumstance cover the bass tank 

cut-out in the car door with a moisture 

protection foil. 

3.2. Tweeter-Midrange-Module 

3.2.1. Insert the midrange-tweeter module into the original cut-outs and wire 

them up. 

3.2.2. Fasten them with the original screws. 

fig.: Tweeter-Midrange-Modul 

without grill 

65125 / 131 Porsche Boxster / 996 - 5- © JEHNERT SOUND DESIGN

4. Cut-outs in door lining 

4.1. Place door lining on a plane surface. 

For vehicles with factory installed Porsche sound system: dismount the grills. 

4.2. Dismount the loudspeakers attached to the panel for transport protection. 

Retain the screws for later assembly. 

4.3. place the mounting template enclosed onto the backside of the doorlining 

align and fit it - please keep to the marks on the template. 

4.4. transfer the cutting lines from the template to the doorlining. 

4.5. take away the panel and cut out the door lining along the marks carefully 

 

fig.: mounting template on the backside of the doorlining 

IMPORTANT !!! 

please do not remove the fastening clips of the door lining (A+B). The 

Original fastening points 1 + 2 (see fig.3) of the car door have to be 

visible in the cut-out. 

fig. car doors without 

doorlining 

Do not remove the mounting clips! 

1 

2 

A 

B 

fig.2: cut-outs door lining 

fig.3: original mounting point 


5. Insulation of the car lining / 

Installation of the car lining onto the doors 

 

Important tip: 

Vibrations from 2 x 160mm subwoofer / each side can lead to annoying 

rattle noises in the car door. 

5.1. Insulation of the car lining/backside: 

5.1.1.self-adhesive vibration suppressing insulation fleece (order.no. 27000) onto 

the backside of the car lining 

 

I m p o r t a n t: 

leave out cut-outs for door-airbag, loudspeakers and door bolts. 

5.1.2. fix a hole for the installation clip (A). 

fig.: backside of the door lining - insulation 

! 

 

attention / danger !!! 

No insulation behind 

the side-airbags 

(fig. “B”) 

I 

Important: 

no insulation-material behind 

- loudspeakers 

- door bolts 

- hole for the installation clip 

(fig.”A”) 

5.2. Installation of the car lining onto the car’s door 

Set the door lining - without mounted panel - onto the car’s door 

and fit it again in contrary order of succession we described on page 3. 


6. Panel alignment/reference points 

Place the door panel on the mounted door lining onto the car door. 

Rerference point for fitting 

 

Only precise alignment of the panel with the 

door lining warrants optimal fit 

6.1. Reference point 1: 

the two most important reference points are the original 

fastening points in the car door (see fig. 1+2) 

• Check the proper fit of the original sheet metal screws for fastening the 

doorlining and panel (1 + 2 as shown in fig.). If necessary clip in the 

supplied new sheet metal nuts 

• Vehicles without installed Porsche sound package: 

addionally clip a sheet metal nut for fastening the panel to the “staysheet” 

at the car door (3 as shown in fig.) 

• Affix the panel with the two Spax screws (1+2) through the door lining 

exactly into the original fastening points and screw only hand tight. 

fig.: ref.point 1 

1= Spax 5,0 x 60 

1 

2= Spax 5,0 x 60 3 

2 

6.2. Reference point 2: 

realign panel again precisely as shown on page 6 

Upper panel edge partly overlaps the separating line between leather and 

carpet. The carpet edge ist not a reference point. 

 

The upper panel edge must fit snugly without gap. 


7. Panel installation - Fastening 

7.1. Use the precisely aligned panel as pattern for the position of the fastening 

points 3-6. Fasten all screws only hand tight: 

• Screw 1 + 2: screw into original fastening point (see page 8) 

• fastening points 3-6: (drill howles are already in the panels) 

use a thin awl to set the marks on the door-lining and 

use a 6mm drill for the screws according to the marks set before 

Notice: please take care that the inner door parts of the panel edge 

will not be damaged by the drill head 

• Screw 3 : screw carefully into door lining: 

Caution! Window lifter motor underneath. 

• Screw 4 : screw through door lining into door metal. 

• Screw 5 -6 : screw into door lining. 

7.2. Check again for proper fit and tighten all screws securely. 

 

 

All cutting edges of the panel must fit the door lining snugly all 

around without gap. 

7.3. Secure the Spax screws with sheet metal nuts. 

Fasten metric bolts with washers and nuts. 

! 

Observe: 

window lifter-motor! 

3 = M4 x 40 

fig.: fastening points 

1 = Spax 5,0 x 60 

5 = M4 x 30 

6 = M4 x 50 

2 = Spax 5,0 x 60 

4 = Spax 5,0 x 70 

description fastening point 1+2 installation see page 8 


8. Crossover circuit - Speaker connection 

8.1. Place crossover circuit behind the middle console. 

8.2. To boost the sound volume create a cut-out in the original door foam foil 

of approx. 20 cm width in length of the pocket and 2 cm in height. 

If a moisture foil was installed as described on page 5 a 20cm long cut in 

the foil is sufficient. 

cut-out the door foam foil 

20cm lenght/2cm height 

8.3. Install subwoofers 

8.4. Wire the subwoofers in parallel to the crossover circuit (see wiring diagram 

on page 11) 

Notice: You you should check the polarity of all subwoofers after before having 

connecting 

connected them to the them crossover to the circuit crossover (cc) circuit with a with 9 volt a battery. 9 volt battery 

(input cable on the side of the amplifier). 

pole of the cc input ✚ 

to ✚ 

of a 9 volt battery 

pole of the cc input to of a 9 volt battery 

 

All subwoofers must move uniformly! 

Wrong polarity of a subwoofer can totally equalize 

the bass sound! 


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Loudspeaker wiring diagram 

Connect all loudspeakers and crossover circuits: 

Circuit diagram of 3way crossover / 2x subwoofer 

Verstärker 

100-200 empfohlene Watt RMS Leistung 

/ 2 Ohm 

100-200 recommended Watt RMS power 

/ 2 Ohm 

amplifier 

Porsche Boxster / 996 

Art.Nr. 60025 3-way crossover circuit 75025/031 

JEHNERT 


D E S I G N 

subwoofer 

tweeter 

frei 

frei 

input 

midrange 

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S p e a k e r 

M A D E I N G E R M A N Y 

T w e e t e r 

JEHNERT 


D E S I G N 

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S p e a k e r 


M i d r a n g e 

JEHNERT 


D E S I G N 

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observe 

2 Ohm-system! 

H 

W O O F E R 

JEHNERT 


D E S I G N 

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S p e a k e r 

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W O O F E R 

JEHNERT 


D E S I G N 

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9. Installation of the speaker’s - grill 

• Press the grill to the panel with the 4 bending brackets into the relative 

relief. 

• Screw the sheet metal screw into the relief for the Porsche-Signet and 

affix the grill to the panel. 

• Clean the adhesive surface of the Porsche-Signet and the upper fastening 

point of the relief from the grill (use Acetone/Detergent). Let the adhesive 

surface get try and stick the Porsche Signet to the grill (ambient temperatur) 

relief to install the grill 

relief to install the grill 

brackets to install the grill 

brackets to install the grill 

fig.: backside of the grill with fleeece 


T e c h n i c a l i n f o r m a t i o n 

Equipment: 

electric window control 

Model/ year : 

986 Boxster / 996 convertible, Coupé, Targa 

Insulation: 

insulation is maningful for the door lining 

- see page 7 

Note about setting: 

To obtain optimal stereoscopic sound, all settings 

on the radio (bass, treble, loudness etc) should be 

set to zero or neutral. 

Recommended 

amplifier power : from 2x 100 - 200 Watt sinus / 2 Ohm 

Metal cutwork : 

not necessary 

Cut-outs for loudspeaker/ 2 x 144mm (max.outer dimensions subwoofer 165 mm) 

each side (max.installation depth subwoofer 80 mm) 

EURO-Norm standard basket 6” 

Sound-System: 

3-ways 

2 x 160 mm subwoofer/ side 

1 x 100 mm midrange / side 

1 x 26 mm tweeter / side 

car-customized crossover network 

Stability time/ music: 2 x 150/200Watt 

Transmission: 

48-22.000 Hz 

Impedance: 

2 Ohm 

Time for Installation 

car hifi-specialist: 3 hours 

We reserve the right to make technical changes, as well as development. 


We have taken great care to explain the procedures in our installation instructions 

more detailed and “step by step”. 

Your hints and suggestions help us for the future to eliminate uncertainties and 

misinterpretation. Therefore, please inform us. what you would like to be improved 

Technical questions: Hotline: 0049-711-77 5897 / 987-87 

56 99-0 

or what we should still change. 

We thank you for your support! 

It is our pleasure to help you! 

Self-help and fault diagnosis 

The following notes serve to help troubleshoot and eliminate faults or malfunctions 

on your own. If the following measures are not effective, please call us. 

What can it be if ... 

..it doesn’t sound right. wrong polarity on the subwoofers ( page 10) 

crosover circuit attached wrong ( page 11) 

Mirko Schwarz Steffen Kretzschmar Marc Sitter 

Doorlining and moisture protection foil 

Development / Quality Saddlery / Completion 

Export / Service 

not cut out ( page 5+10) 

No: - 67 

No: - 69 

No: - 68 

ampilifier doesn’t have enough power( page 13) 

Dear customer, 

...it We doesn’t have taken fit correctly. great care to explain door panel the procedures customization in our ( installation page 8) instructions 

more detailed and “step by step”. 

installation of the panels on the door lining (page 9) 

Your hints and suggestions help us for the future to eliminate uncertainties and 

.....grills misinterpretation. do not hold. Therefore, please observe inform notes us. on what page you would 12! like to be improved 

or what we should still change. 

vibrations insulation, see notes on page 7 

We thank you for your support! 

possible cause/ solution 

 

amplifier connection 

 

 

 

 

 

 

 

65125 Self-help / 131 Porsche and Boxster fault / 996 diagnosis- 14 - © JEHNERT SOUND DESIGN 

The following notes serve to help troubleshoot and eliminate faults or malfunctions 

on your own. If the following measures are not effective, please call us. 

What can it be if ... 

possible cause/ solution 

..it doesn’t sound right. wrong polarity on the subwoofers ( page 10) 

crosover circuit attached wrong ( page 11) 

Doorlining and moisture protection foil 

not cut out ( page 5+10) 

ampilifier doesn’t have enough power( page 13) 

amplifier connection 

...it doesn’t fit correctly. door panel customization ( page 8) 

installation of the panels on the door lining (page 9) 

.....grills do not hold. observe notes on page 12! 

vibrations insulation, see notes on page 7 

 

 

 

 

 

 

 

 


G u a r a n t e e 

We grant a manufacturers guarantee of 2 years starting from the date of purchase 

of the door panels or sound system from the dealer. 

Within this guarantee period to our choice we either repair or replace free of 

charge all defects due to material or workmanship. 

Exempt from this guarantee are damages due to improper use, wear and tear or 

damages which have to be led back on wear or interventions by third parties. 

The guarantee does not cover subsequent damages or such defects that only 

insignificantly impair the value or the usability of the panels/sound system. 

The guarantee does not cover damages due to external influences. 

Panels with additional or wrong assembly drill holes cannot be returned. These 

are damages to the panel which cannot be repaired again. 

2003/by.aj/FH - 15 -

part-no. - Jehnert Sound Design

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