PSB P3 vs PSB Alpha AM3 Comparison

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PSB P3

Passive Bookshelf | 57-21k Hz

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PSB Alpha AM3

Powered Bookshelf | 56-20k Hz

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PSB P3

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PSB Alpha AM3

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PSB P3

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PSB Alpha AM3

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PSB P3 vs PSB Alpha AM3 Speaker Comparison

In this review, we will be comparing Alpha P3 and Alpha AM3, two Bookshelf speakers by PSB. The main difference between these two speakers is that the PSB Alpha AM3 is a Powered speaker which means that it has a built-in amplifier inside the speaker body so you don't need an external power amp or an integrated amp whereas the PSB P3 is a Passive speaker so has to be matched with an amplifier to get any sound from it.

Let's have a brief look at the main features of PSB P3 and PSB Alpha AM3 first before getting into our more detailed comparison.

Key Specs	PSB P3	PSB Alpha AM3
Brand	PSB Canada · founded 1972	PSB Canada · founded 1972
Design	2-way	2-way
Built-in amplifier	—	70-watt RMS
Tweeter	0.75" Hard-Dome	0.75" Hard-Dome
Woofer	4.5" Polypropylene	4" Polypropylene
Frequency response	57-21k Hz	56-20k Hz
Sensitivity	87 dB	—
Impedance	8 ohms	—
Power range	10-80 watts	—
Max depth / sample rate	—	24-bit / 48 kHz
Bluetooth	—	Built-in 5.0
Weight	2.23kg / 4.9lbs	4.50kg / 9.9lbs
Dimensions (H x W x D)	8-3/4" x 5-3/16" x 7-5/16" 223.0 x 132.0 x 186.0mm	8.6875" x 5.1875" x 8.125" 220.7 x 131.8 x 206.4mm

Alpha P3 and Alpha AM3 are members of PSB's Alpha series of speakers. Below you can find the loudspeakers from this series.

PSB Alpha Series History

Model	Body	Frequency	Sensitivity	Impedance	Woofer
PSB P3	Bookshelf	57-21k Hz	87 dB	8Ω	1 x 4.5"
PSB Alpha T20	Floor-standing	36-21k Hz	90 dB	8Ω	2 x 5.25"
PSB P5	Bookshelf	55-21k Hz	89 dB	8Ω	1 x 5.25"
PSB Alpha C10	Center Channel	55-21k Hz	90 dB	8Ω	2 x 5.25"

The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.

Drivers

Both Alpha P3 and Alpha AM3 are 2-way speakers.

PSB P3

PSB Alpha AM3

TweeterWoofer

Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.

Driver	PSB P3	PSB Alpha AM3
Driver Setup	2-way	2-way
Tweeter	0.75-inch	0.75-inch
Midrange	-	-
Woofer	1 x 4.5-inch	1 x 4-inch

Alpha P3 features a 0.75" anodized aluminum Hard-Dome Tweeter and 1 x 4.5" Polypropylene Woofer with a Crossover frequency at 3000Hz. On the other hand, the Alpha AM3 features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4" Polypropylene Woofer.

Frequency Response

Alpha P3 has a frequency range of 57-21k Hz whereas Alpha AM3 has a frequency range of 56-20k Hz. With a minimum frequency of 56Hz, the Alpha AM3 can go slightly deeper then the Alpha P3's min frequency of 57Hz.

The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.

Low Frequency

Bookshelf Speakers

Alpha P3

Alpha AM3

Min

Average

Median

Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.

Cabinet Type and Port Position

Both Alpha P3 and Alpha AM3 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.

If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.

Physical Specs

The size of a speaker can sometimes be an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare PSB P3's and PSB Alpha AM3's external dimensions. PSB P3 has external dimensions of 223.0 x 132.0 x 186.0mm (8-3/4 x 5-3/16 x 7-5/16inch) whereas PSB Alpha AM3 has external dimensions of 220.7 x 131.8 x 206.4mm (8.6875 x 5.1875 x 8.125inch).

PSB Alpha AM3 is 0.19999999999999mm narrower and 2.3mm shorter than PSB P3 but it is also 20.4mm deeper.

Below you can see the front view size comparison of PSB P3 and PSB Alpha AM3 in scale.

Comparison image of PSB P3 and PSB Alpha AM3 Size and External Dimensions

Base Surface Area Comparison
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited. The base surface area of the PSB P3 is approximately 245.5cm² / 38.1inch² and base area of the PSB Alpha AM3 is approximately 272.0cm² / 42.2inch². The Alpha P3 requires 10% less surface area than the Alpha AM3 which gives it a small advantage on placement in tight spaces.

Here is another comparison that shows both speakers on a BDI Octave Media Cabinet, next to a standard size amplifier and turntable in scale:

Size Comparison image of PSB P3 and PSB Alpha AM3 on a Media Console

What's in the Box of PSB P3?

Here are the items that are included inside the box of Alpha P3:

2 Bookshelf loudspeakers
2 Grilles
8 Self-adhesive rubber feet
Quick Start Guide
Warranty Card

What's in the Box of PSB Alpha AM3?

Here are the items that come with the Alpha AM3:

Powered speaker
Passive speaker
2 Grilles
AC power adapter (attached 45-inch DC cord)
4-feet AC power cord
Remote control (PSR-1)
2 AAA batteries
8-feet Speaker cable
58-inch Stereo minijack cable
8 Self-adhesive rubber feet
Connection Diagram
Warranty Card

Reasons to choose PSB Alpha P3 over PSB Alpha AM3

Woofer Size	4.5 inches vs 4 inches	Larger woofer
High Frequency Response	21k Hz vs 20k Hz	Generates higher frequency
Base Surface Area	245cm² vs 272cm²	Takes less floor space
Price per pair*	279USD vs 449USD	costs less (*prices may change depending on the seller, location and time)

Reasons to choose PSB Alpha AM3 over PSB Alpha P3

Speaker Type	Powered vs Passive	Built-in amplifier
Low Frequency Response	56 Hz vs 57 Hz	Generates deeper bass
Height	220mm vs 223mm	Easier to fit in smaller spaces
3.5mm Connection	Yes vs No	Connection via 3.5mm AUX input

PSB P3 vs PSB Alpha AM3 Specs Table

Detailed comparison of specifications

General	PSB Alpha P3	PSB Alpha AM3
Brand	PSB	PSB
Speaker Type	Bookshelf speakers	Powered Stereo Speakers
Sensitivity	87 dB	n/a
Impedance	8 ohms	n/a
Impedance	4 ohms	n/a
Frequency Response	57-21k Hz	56-20k Hz
Amplifier
Watts RMS (Continuous)	n/a	70-watt RMS
Max Bit Depth	n/a	24-bit
Max Sample Rate	n/a	48 kHz
Drivers
Woofer Quantity	1	1
Woofer Size	4.5"	4"
Woofer Composition	Polypropylene	Polypropylene
Woofer Surround Material	Rubber	Rubber
Tweeter Size	0.75"	0.75"
Tweeter Type	Hard-Dome	Hard-Dome
Aimable Tweeter	No	No
Midrange Driver	No	No
Crossover Frequency	3000Hz	n/a
Firing Direction	rear	rear
Physical Specs
Height	223.0mm (8.8")	220.7mm (8.7")
Width	132.0mm (5.2")	131.8mm (5.2")
Depth	186.0mm (7.3")	206.4mm (8.1")
Weight	2.23kg (4.9lbs)	4.50kg (9.9lbs)
Enclosure	Bass Reflex	Bass Reflex
Finish	MDF, Wood-grain vinyl	MDF, Wood-grain vinyl
Available Colors	Walnut,Black Ash	Matte Black, Matte White
Mounting Bracket	No	No
Recommended Stand Height	28-30"	n/a
Grille	Yes	Yes
Moisture Resistancy	No	No
Connections
Biamp Inputs	No	n/a
Aux Inputs	n/a	3.5mm
USB Port	n/a	microUSB
Phone Input	n/a	Yes
Subwoofer Output	n/a	No
Digital Input	n/a	Optical
HDMI Input	n/a	No
Headphone Jack	n/a	No
Ethernet Port	n/a	No
Other
Parts Warranty	5 Years	1 Year
Labor Warranty	5 Years	1 Year

Verdict

Different kinds of product: one is active with its amplifier built in, the other passive and needs one. Judge them on how you want to own the system, not just the specs.

Area	Better	Why
Bass	evenly matched	Much the same reach (57Hz vs 56Hz).
What you buy	depends	PSB Alpha AM3 is a complete system - just add a source. PSB P3 also needs an amplifier: more money and another box, but you choose it.
Connections	depends	PSB Alpha AM3 has Bluetooth and phono built in. With PSB P3 that all comes from the amplifier you pair it with.
Upgrade path	depends	PSB P3 can be re-amped later and outlive several amplifiers; PSB Alpha AM3 ages as one unit.
Size	depends	Similar cabinet size - neither is easier to fit.
Price	A	PSB P3 is cheaper - $279 against $449, about 38% less; arguably a different class. Speakers only - an amplifier narrows that gap.

A PSB P3 B PSB Alpha AM3
depends neither is better in the abstract - it turns on your room, your system or how you will use them. Only specs published for both speakers are judged; anything missing on either side is left out rather than guessed.

Which should you choose?

PSB Alpha AM3 suits you if you want one box, ready to play, with nothing else to buy. PSB P3 suits you if you already have an amplifier, want to choose the electronics, or expect to upgrade in stages. Neither is the better speaker in the abstract. Think about the whole system, not just the speakers: the roughly $170 saved by taking the cheaper pair would buy a subwoofer or a better amplifier, and either usually does more for the sound than the difference between these two.

And remember what a spec sheet cannot show: how each looks in your room and whether the finish suits it, what dealer support and warranty are like where you live, and how they actually sound to you. If you can hear them first - ideally with your own music - that will tell you more than any number above.