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From our technical experts

Certikin Under Water Speaker


  • Under Water Speaker
  • Rated power Impedance 8ohms 20W
  • Designed to fit inside a Certikin light niche


Certikin Under Water Speaker

Certikin Under Water Speaker. These 20W underwater speakers have been designed to fit inside a Certikin light niche (in place of light guts). They have a rated power impedence of 8 ohms. Comes with a 10m cable.

An isolating transformer should be used with each speaker.

The speakers should be driven by an amplifier of a suitable size. Please consult a hi-fi specialist to ensure correct sizing.

Product Code SL600UC


The speaker guts SL600UC contains a 20-watt loud speaker of 8 ohms, to be installed under water in our standard niche (pu9). The main working part is completely encased in rubber, which eliminates corrosion and electrolysis damage.

Because water is denser than air, sound travels well but does require a little more power to move the water. Care must be taken not to overpower the unit as damage may occur.

As most amplifier systems require two speakers for stereo reproduction, two speakers must be connected to prevent amplifier damage.

Each underwater speaker must be isolated from the amplifier unit by means of the isolation transformer (SL600TC). Each speaker unit comes with a length of waterproof double insulated cable embedded into the rubber housing, this can be extended if required. A pools side junction deck box (PU10N) is recommended for ease of future access.

The Speakers should be installed to a depth of at least 1 metre, to avoid sound disruption by surface currents. Two loudspeakers will be sufficient for a swimming pool of 20m x 10m.

These Speakers are not designed for out of water use, if used out of water over heating may occur.

Excessive bass frequencies will damage this unit, therefore do not apply bass boost also over-driving these speakers will void any warranty.

Please ensure these speakers are connected to the correct power source – LOW IMPEDANCE AMPLIFIER ONLY via the isolation transformer.

20 watts
8 Ohms
Frequency 250Hz -14KHz

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Returns Policy

Your rights to return goods are protected under the EU Distance Selling Directive.

You are entitled to cancel your order and return the goods within 7 working days for a full refund not including the cost of delivery. Do this by contacting us by email or telephone and quoting the order number supplied to you. Your refund will be paid within 30 days. You are responsible for the cost and risk of loss or damage when returning the goods, so you should take out enough postal insurance to cover their value. This cancellation policy does not affect your rights when we are at fault - for example, if goods are faulty or incorrectly-described.

Exclusions: Bespoke items (made to measure items) are not included and cannot be returned. If a bespoke item is faulty then the product warranty /guarantee will take effect.

Any goods returned should be in saleable condition.

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