Vintage Boutique Tour
Liam will walk you through the Infinity Quantum 5.
A narrated 4-scene walk-through by your host — quirks, sound, and fair value.
Know someone chasing this sound?
Send them the Infinity Quantum 5 match.
Sponsored · eBay
Hand-picked vintage speakers on eBay
ACOUSTIC RESEARCH AR-10π Vintage Speaker Pair Super Rare Free shipping
Klipsch Heresy II Vintage Speakers Pair – Restored – 1-Year Warranty
Acoustic Research AR-3 Speakers PAIR Vintage Original
As an eBay Partner, SoundMatch earns from qualifying purchases.
Premium AI Voice Guide
PROLiam's bench-side rundown of the Infinity Quantum 5.
Real-time streaming voice — specs, history, restoration pain points, market value.
Sonic Similarity Analysis
Both speakers use planar magnetic technology to achieve extraordinary speed, transparency, and detail resolution beyond conventional cone drivers. The Quantum 5 pioneered this approach with EMIT/EMIM drivers; the LRS+ continues the tradition with modern Magnepan quasi-ribbon panels. Both deliver effortless imaging and natural timbre with minimal cabinet resonance, though requiring powerful amplification.
Infinity Quantum 5
vs.
Magnepan LRS+
88 dB
Sensitivity
86 dB
4–4 Ω
Impedance
4–4 Ω
30–150W
Power Handling
50–200W
4-way
Driver Count
2-way
EMIT planar tweeter, 2x EMIM planar midrange, 10in woofer
Driver Config
True ribbon tweeter, quasi-ribbon planar magnetic woofer/mid
Sealed
Enclosure
Open-baffle
Floorstander
Size
Floorstander
35Hz – 32kHz
Frequency Response
45Hz – 25kHz
60 lbs
Weight
24 lbs
Vintage (used avg)
$1,200
Modern (new)
$995
Difference
$205less new
Cross-Match Engine · Pro
What pairs with this?
Reverse-match works both ways. Point us at a receiver and we surface compatible vintage speakers and turntables — matched on power, impedance, and era. Point us at a pair of speakers and we surface receivers with enough headroom to drive them cleanly. Available on Pro and Flipper Pro.
Don't want to pay $1,200?
Get an email when this Infinity Quantum 5 drops on eBay.
Set your target price — we'll watch listings and ping you the moment one hits it. Free, no spam.