Infinity SM-152

A floor-standing studio monitor from Infinity's SM series, with adjustable drivers and high sensitivity.

Overview

The Infinity SM-152 is a floor-standing speaker in the Infinity SM (Studio Monitor) Series. It was made in the USA as a high-performance studio monitor with user-adjustable response controls. It's a 3-way design in a bass reflex enclosure, known for high sensitivity and polypropylene drivers.

Specifications

Type	3-way
Enclosure	Bass Reflex
Nominal Impedance	8 Ohm (sources conflict: some list 4 Ohm)
Recommended Amplifier Power	10 to 300 watts
Frequency Response	44Hz - 25kHz (+/-3dB)
Sensitivity	102 dB
Woofer	1 × 15″ (381 mm) polypropylene-coated low-frequency driver
Midrange	2 × 4.5″ (114 mm) polypropylene membrane drivers
Tweeter	1 × 25 mm
Special Features	2 potentiometers for tweeter and midrange driver level adjustment

Design

The SM-152 uses Infinity's polypropylene woofers. Adjustable potentiometers set the output levels of the tweeter and midrange drivers, so you can tune the speaker to the room.

Market

Owners report that the woofer surrounds need re-foaming after extended use. User groups mention it often. Spare crossover plates (J1012-112152) are available, and some units have been professionally re-foamed. Original retail price was $999 each in 1987.

Market Value

┌──────────────────────────────────────────────────────────────────────────┐
│ INFINITY SM-152                                                 Nov 2026 │
├──────────────────────────────────────────────────────────────────────────┤
│ High      $1,700                                  Latest          $1,250 │
│ Median    $1,400                                  Trend                — │
│ Low       $571                                    Volume           ~1/mo │
├──────────────────────────────────────────────────────────────────────────┤
│ $2,000 ┤                                                                 │
│        │                                                                 │
│        │.                                                                │
│ $1,357 ┤                                          .                      │
│        │                                                                .│
│        │                                                                 │
│        │                                                                 │
│   $500 ┤                               .                                 │
│        ├─────────────────────────────────────────────────────────────────│
│    vol │█                              █          █                     █│
│        └─────────────────────────────────────────────────────────────────│
│         2026-01                      2026-03                      2026-06│
└──────────────────────────────────────────────────────────────────────────┘

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