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Infinity Quantum 2

Four Way Loudspeaker System (1977)

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Infinity Quantum 2


Your ears may not know the difference between this superb speaker and its progenitor, the Quantum Line Source - until you hear the price.

In the Quantum Line Source, the range of the Infinity Watkins Dual Drive Woofer extends down
to 18 Hz. Here in the closest competitor, the Quantum 2, it reaches 24 Hz - but you get an extra 2dB of efficiency.

Our Quantum Line Source stacks its Electromagnetic Induction Tweeters (EMITs) eight high. The more compact Quantum 2 uses the same tweeters, but not quite so lavishly.

Same high definition 3.8 centimetre dome midrange driver; same transmission line midbass coupler; same scrupulous attention to phasing and crossover technology.

Hear Quantum 2. Its resemblance to the Infinity Quantum Line Source is striking. Except around
the price tag.


Type: 4 way, 7 driver loudspeaker system

Frequency Response: 24Hz to 32kHz

Recommended Amplifier: 60 to 350W

Crossover Frequency: 200, 600, 4000Hz

Bass: 1 x 300mm dual voice coil

Midbass: 1 x 100mm coupler

Midrange: 2 x 38mm ventilated dome

Tweeter: 3 x EMIT

Dimensions: 1240 x 460 x 330mm

Weight: 60kg

Year: 1977


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Reviewed Jan 03rd, 2019 by Gunnar B

This is a superb loudspeaker with a neutral sound and a beautiful 3D sound picture completed with detailed sound depth. The bass is also superb even in the infra-sub tones. Do note that they need a powerful amp, not in Watts but with a minimum of 15 Ampere. The best combo is to use the bi-amp connectors and use transistors for the woofer and tubes or transistors for the mid-bass/midrange/treble.
There is only one negative thing to note: The surrounding woofer suspension ring made of foam plastic gets cracked after approx 15 years. However, this is solved by me after having some calls with the manufacturer Peerless who had a replacement part made of long-term rubber without damage of the specs and sound. The suspension was of resonable price too.
I have also completed the speakers with a smaller EMIT tweeter a the back side to get the sound depth picture even more detailed (by recommendation of engineers at Infinity).
I recommend the Quantum 2 for those that listen to both classical and modern music including pop, disco and metal!



This website is not affiliated with or sponsored by Infinity. To purchase Quantum 2 spares or accessories, please contact the company via their website or visit an authorised retailer.