In this review, we will be comparing Alpha AM3 and LS50 Wireless, two Powered Bookshelf speakers from PSB and KEF. Being Powered speakers, they both have built-in amplifiers so you don't need an external power amp or an integrated amp to power them. Let's have a brief look at the main features
of PSB Alpha AM3 and KEF LS50 Wireless first before getting into our more
detailed comparison.
In the following sections, we will get into more detail in order to better understand how the PSB Alpha AM3 and KEF LS50 Wireless compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
Both Alpha AM3 and LS50 Wireless are 2-way speakers.
Driver |
PSB Alpha AM3 |
KEF LS50 Wireless |
Driver Setup
|
2-way
|
2-way
|
Tweeter
|
0.75-inch
|
1-inch
|
Midrange
|
- |
- |
Woofer
|
1 x 4-inch
|
1 x 5.25-inch
|
Alpha AM3 features a 0.75" Aluminum Hard-Dome Tweeter and 1 x 4" Polypropylene Woofer . On the other hand, the LS50 Wireless features a 1" Aluminum Hard-Dome Tweeter and 1 x 5.25" Magnesium/aluminum alloy Woofer .
Frequency Response
Alpha AM3 has a frequency range of 56-20k Hz whereas LS50 Wireless has a frequency range of 79-28k Hz. With a minimum frequency of 56Hz, the Alpha AM3 can go significantly deeper on the low side and provide stronger bass compared to the LS50 Wireless's min frequency of 79Hz.
Below graphs depict how these two speakers compare with the max, min and average values of the Min and Max Frequencies of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Cabinet Type and Port Position
Both Alpha AM3 and LS50 Wireless 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
Size of a speaker can sometimes become 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 Alpha AM3's and KEF LS50 Wireless's external dimensions. PSB Alpha AM3 has external dimensions of 220.7 x 131.8 x 206.4mm ( 8.6875 x 5.1875 x 8.125inch) whereas KEF LS50 Wireless has external dimensions of 301.6 x 200.0 x 336.5mm ( 11.875 x 7.875 x 13.25inch) .
KEF LS50 Wireless is clearly the larger of the two speakers. Its body is 68.2mm wider, 80.9mm taller and 130.1mm deeper than PSB Alpha AM3.
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 Alpha AM3 is approximately 272.0cm2 / 42.2inch2 and base area of the KEF LS50 Wireless is approximately 673.0cm2 / 104.3inch2. The Alpha AM3 requires 60% less surface area than the LS50 Wireless which gives it a small advantage on placement in tight spaces.
Weight Comparison The weight of a loudspeaker can become an important factor if you need to move and reposition the unit often. Weight of a speaker can also "sometimes" be an indicator of the rigidity of the enclosure and the quality of the internal components used. The PSB Alpha AM3 weighs 4.50kg / 9.9lbs and the KEF LS50 Wireless weighs 10.00kg / 22lbs. This makes the LS50 Wireless 122% heavier than the Alpha AM3.
Here is a comparison of how Alpha AM3 and LS50 Wireless's weights compare with the average, max and min weights in Powered Bookshelf class.
Weight
All Bookshelf Speakers
What's in the Box of PSB Alpha AM3?
Here are the items that are included inside the box of 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
What's in the Box of KEF LS50 Wireless?
Here are the items that come with the LS50 Wireless:
Wireless powered speaker (Right)Wireless powered speaker (Left)Two 6.5-feet AC power cords10-feet Cat-6 interconnect speaker cable6.5-feet USB-B to USB-A cable42
Low Frequency Response |
56 Hz
vs
79 Hz
|
Generates deeper bass |
Height |
220mm
vs
301mm
|
Easier to fit in smaller spaces |
Base Surface Area |
272cm2 (131x206mm)
vs
673cm2 (200x336mm)
|
Takes less floor space |
3.5mm Connection |
Yes
vs
No
|
Connection via 3.5mm AUX input |
Phono Input |
Yes
vs
No
|
Connect your turntable directly |
Woofer Size |
5.25 inches
vs
4 inches
|
Larger woofer |
High Frequency Response |
28k Hz
vs
20k Hz
|
Generates higher frequency |
App-Based Control |
Apple iOS, Android
vs
None
|
Control the speaker via an app |
Ethernet Connection |
Yes
vs
No
|
High quality streaming over Ethernet |
USB Port |
USB-B
vs
No
|
USB port adds flexibility |
RCA Connection |
Yes
vs
No
|
Connection via RCA input |
Subwoofer Output |
Wired
vs
No
|
Pair your speakers with external subwoofer |
General |
PSB Alpha AM3 |
KEF LS50 Wireless |
Brand |
PSB |
KEF |
Speaker Type |
Powered Stereo Speakers |
Powered Stereo Speakers |
Frequency Response |
56-20k Hz |
79-28k Hz |
Amplifier |
|
|
Watts RMS (Continuous) |
70-watt RMS |
230-watt RMS |
Max Bit Depth |
24-bit |
24-bit |
Max Sample Rate |
48 kHz |
192 kHz |
Drivers |
|
|
Woofer Quantity |
1 |
1 |
Woofer Size |
4" |
5.25" |
Woofer Composition |
Polypropylene |
Magnesium/aluminum alloy |
Woofer Surround Material |
Rubber |
Rubber |
Tweeter Size |
0.75" |
1" |
Tweeter Type |
Hard-Dome |
Hard-Dome |
Aimable Tweeter |
No |
No |
Midrange Driver |
No |
No |
Firing Direction |
rear |
rear |
Physical Specs |
|
|
Height |
220.7mm (8.7") |
301.6mm (11.9") |
Width |
131.8mm (5.2") |
200.0mm (7.9") |
Depth |
206.4mm (8.1") |
336.5mm (13.2") |
Weight |
4.50kg (9.9lbs) |
10.00kg (22lbs) |
Enclosure |
Bass Reflex |
Bass Reflex |
Finish |
MDF, Wood-grain vinyl |
n/a |
Available Colors |
Matte Black, Matte White |
n/a |
Mounting Bracket |
No |
No |
Grille |
Yes |
n/a |
Moisture Resistancy |
No |
No |
Connections |
|
|
Aux Inputs |
3.5mm |
RCA |
USB Port |
microUSB |
USB-B |
Phone Input |
Yes |
No |
Subwoofer Output |
No |
Wired |
Digital Input |
Optical |
Optical |
HDMI Input |
No |
No |
Headphone Jack |
No |
No |
Ethernet Port |
No |
Yes |
Other |
|
|
Parts Warranty |
1 Year |
1 Year |
Labor Warranty |
1 Year |
1 Year |