SPS Series

Sonitron Polymer/metal Speakers (SPS) produce high sound quality with low distortion and guarantee the perfect reproduction of music and speech. They have a very flat design and are delivered with an open front. They can be used in difficult environmental conditions and applications because of resistance of the front to water, humidity, vibrations, and dust. Piezoceramic speakers feature a low weight and low energy consumption relative to their sound output levels. They do not generate an electromagnetic field, making it easier for designers to ensure that their products meet EMC requirements and regulations.

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Advantages

Very flat and solid design construction
Dust, water- and shockproof
Resistant to temperature variations
Broad frequency range in small size
Combined use as speaker/micro
no electromagnetic field (EMC)
Little energy required at low frequencies
Less current consumption needed in the leads to the speaker
60% higher acoustic output for smaller speakers compared to electrodynamic speakers
Low weight
Low distortion
High impedance
Can be driven directly by IC

Applications


Home Equipment	Communication equipment	Talking buzzer & doorbell	Computer equipment


Cars, busses, and trains	Vending machines	Industrial equipment	Portable voice recorders


Paying systems	Mobile phone	Car audio system

Products

Model	Operating voltage ( Vac pp)	Frequency range (Hz)	Max SPL (dB @1m, average 4 points)	Applications	Capacitive load	Dimensions mm (LxWxH)
SPS-2220-03	1-24	700-20000	85*	GSM, GPS, MP3, camera,…	70nF	22x20x2
SPS-3530-03	5-60	700-20000	81	PDA,GPS, notebooks,…	220nF	43.5x39x2
SPS-4640-03	5-60	400-20000	83	PDA,GPS, notebooks,…	225nF	50×43.6×2
SPS-6555-03	5-60	300-20000	83	Multimedia,…	480nF	65x55x2
SPS-8770-03	5-60	200-20000	84	Computers, …	580nF	87x70x2

*@10cm, designed for headphone applications!

Impedance

Theoretical the main impedance of the piezo speakers is a capacitive reactance and follows an asymptotic function.

The typical practical impedance values (+/- 20%) for frequencies of 100Hz up to 20kHz of our speakers are as follows:

Model	SPS-2220-03	SPS-3530-03	SPS-4640-03	SPS-6555-03	SPS-8770-03
Capacitance (+/-20%)	70 nF	220 nF	225 nF	225 nF	580 nF
Z @ 100 Hz	22360 ohm	5714 ohm	6210 ohm	3845 ohm	2314 ohm
Z @ 1 kHz	2162 ohm	603 ohm	680 ohm	445 ohm	266 ohm
Z @ 2 kHz	1183 ohm	311 ohm	360 ohm	223 ohm	133 ohm
Z @ 5 kHz	497 ohm	127 ohm	143 ohm	92 ohm	54 ohm
Z @ 10 kHz	245 ohm	65 ohm	73 ohm	45 ohm	28 ohm
Z @ 15 kHz	168 ohm	43 ohm	49 ohm	31 ohm	19 ohm
Z @ 20 kHz	125 ohm	32 ohm	37 ohm	23 ohm	14 ohm

Sound pressure level vs. frequency

Dimensions ( All dimensions in mm)

Product codification

List of available products

SPS-2220-03	SPS-3530-03-C1	SPS-4640-03-C1	SPS-6555-03-C1	SPS-8770-03-C1
SPS-2220-03	SPS-3530-03-C2	SPS-4640-03-C2	SPS-6555-03-C2	SPS-8770-03-C2

Mounting guidelines

The SPS speakers can be mounted in several different ways. The mounting methods illustrated below are recommended to mount all the SPS speaker models. Please keep in mind that not too much mechanical stress is placed on the frame of the piezoceramic speaker after mounting.

Important note:

Piezoceramic speakers produce sound by the forward and backward movement of a flat membrane. During this movement, the membrane creates an air pressure wave in front and at the backside of the membrane. A forward movement will create a slight overpressure at the front side and a slight underpressure at the backside and vice versa. It is therefore important that the front and backside are acoustically isolated from each other to avoid air pressure cancellation and consequently a serious reduction of the sound output.

When a speaker is mounted in a panel or in the wall of a housing, the front side is acoustically isolated from the backside.