Seas SP22R H9945 Passiv Membrane

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SP22R H9945

SP22R is a passive radiator intended for use as an alternative to the port in a bass reflex cabinet, together with an active woofer of similar size or smaller.

In many applications, the traditional bass reflex port may produce high speed air noise or even have poor effect due to a small port area or a large port length. In such cases, a passive radiator may bring about an improvement.

The chart below will show you the mass which has to be added to the cone of the passive radiator in order to obtain the desired Helmholtz resonance frequency in a given cabinet volume.

The passive radiator cone is equipped with an M4mm screw to which you can easily attach the added mass.

For optimum performance, the passive radiator should be mounted vertically (with horizontal cone axis). This is especially important when a significant additional mass is used.

Short data

Usage as Passive Membrane


Overall dimensions 220 mm
Baffle cutout 186.4 mm
Depth (Total) 56 mm


Resonance fs fs: 22 Hz
Equivalent Air-Volumen Vas: 138 Liter
Mech. Compliance Cms: 1.87 mm/N
Moving Mass Mms: 28 g
Membrane Area Sd: 230 cm²

Technical drawing

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.