Wavecor PR178WA01 Passiv-Membran

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Wavecor PR178WA01 Passiv-Radiator

PR178WA01 is a passive unit designed for dedicated subwoofer applications - as a partner to our active subwoofer units. Due to low mechanical losses PR178WA01 masters equally well low level details and extreme dynamic requirements. For demanding subwoofer applications using a passive unit is usually the only real alternative to sealed enclosures with active bass boost.
To make experimenting and individual tuning convenient and easy, the PR178WA01 is delivered with three separate extra loads that are easily applied onto a threaded rod on the rear side of the cone (see picture below).

Adding mass:
Extra mass is easily added on the rear (see picture above). Either one, two or all three included mass loads can be added, or any custom mass object can be added simply using an M8 nut for fastening. The loads included with PR178WA01 do not require any nuts as they are made with M8 threaded center holes.
For experiments trying out different values of moving mass for different tunings, it is usually sufficient just to tighten the loads/nut by hand.
Once the final mass has been determined it is recommend to add some adhesive to secure the loads from coming loose during operation.

Key features:
  • Extremely rigid aluminium cone for precise transient response
  • Very low mechanical losses
  • Rear M6 threaded rod for trouble-free and rigid addition of extra mass
  • Delivered with three separate mass loads for easy custom tuning

Short data

Usage as Passive Membrane


Overall dimensions 178 mm
Baffle cutout 141 mm
Depth (Total) 42 mm
Frame Material Steel plate
Membrane Surround Rubber


Mechanical Q Qms: 24
Equivalent Air-Volumen Vas: 17 Liter
Mech. Compliance Cms: 0.70 mm/N
Moving Mass Mms: 50 g
Max. Excursion +/- Xmax: 14 mm
Membrane Area Sd: 131 cm²

Technical Dimensions

PDF-Product information

You receive a 2 year warranty from the date of purchase for all of our high quality hifi-products.

If you observe any problem while using the product, you have the possibility to contact our friendly service team.

You can also easily manage your guarantee concern – without being obliged to – under the section My Account.