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Infinity Quantum 3

Four Way Loudspeaker System (1977)

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Infinity Quantum 3


What made a company stop production of the best selling speaker in its price class? The astounding sound of Quantum 3.

We know. The company was Infinity. And the speaker we decided to phase out was our own critically praised, hugely successful Monitor IIa.

Why? Because the same Dual Drive Woofer, the same EMIT, and other electro acoustic advances in our Quantum Line Source are used in this compact Quantum 3 as well.

And the technology that goes into our Quantum Series - and the musical revelations that come out - really do stamp Obsolete across every previous speaker system, including our own.

For proof, just listen and discover that a pair of Quantum 3 speakers let you hear every instrument not only in its own voice, but in its own position front to back, as well as left to right.

Quantum 3 may well be the third best speaker in the world. For overall value, perhaps you'll rank it somewhat higher.


Type: 4 way, 5 driver loudspeaker system

Frequency Response: 28Hz to 32kHz

Recommended Amplifier: 60 to 250W

Crossover Frequency: 200, 600, 4000Hz

Bass: 1 x 300mm dual voice coil

Midbass: 1 x 100mm coupler

Midrange: 1 x 38mm ventilated dome

Tweeter: 2 x EMIT

Dimensions: 1020 x 460 x 330mm

Weight: 50kg

Year: 1977


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This website is not affiliated with or sponsored by Infinity. To purchase Quantum 3 spares or accessories, please contact the company via their website or visit an authorised retailer.