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Crédit photo: .Kartesian company

Cox135_vPA-S is a high quality coaxial loudspeaker with low-midrange and tweeter dedicated to demanding compact application.

Thanks to the advanced pole pieces geometry and specific membranes, it provides clear and neutral sound reproduction from 180Hz to 20 000Hz, and very low THD.

We suggest a crossover point around 4000Hz, 12dB/Oct between low-midrange and tweeter.

T&S parameters


Fs : 158Hz

SPL : 91dB /2,8V /1m

Re : 6.5Ω

Qms : 2.36%

Qts : 0.59%

Bl : 8.78N/A

VAS : 1.38L

Mms : 9.4g

Sd : 95cm²

Frequency responses

On IEC baffle

Pink noise

Distance: 1m

Signal input: 2,83V

Dash curves: 30° & 60°

Protection HPF applied on Tweeter : 1500Hz - 12dB/Oct

Curve below 120Hz is simulated in 3L sealed enclosure, Fc = 180Hz

Blue :Low-Midrange/ Yellow : Tweeter

Smoothing: 1/12 Octave

Impedance measured in free air

Cox135_vPA-S_Official Response.PNG
Cox135_vPA-S_Official Drawing_edited_edi

Mechanical drawing

Unit: [mm]

Advanced design

Crédit photo: .Kartesian company


Pressed and treated paper

"M" roll damped fabric surround
Polyester / cotton spider

Ø38.5mm, CCA Wire, Glass fiber former

High grade Fe magnet, Cooper ring

Injected aluminum, vented spider



Treated aluminum dome

Ø25mm, CCA Wire, KSV former

NdFeB magnet, 14600 Gauss

Aluminum, heat sink integrated

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Advanced measurements

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Note: We improve continually our products. No contractual data.
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