In this review, we will be comparing Radius 390 and Radius 380, two Powered Subwoofer speakers by Monitor Audio . Being Powered subwoofers, 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 Monitor Audio Radius 390 and Monitor Audio Radius 380 first before getting into our more detailed comparison.
In the following sections, we will get into details in order to better understand how the Monitor Audio Radius 390 and Monitor Audio Radius 380 compare and hopefully end up with enough arguments to decide which one of these subwoofers 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
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Both Monitor Audio Radius 390and Monitor Audio Radius 380 have a single woofer setup however the Monitor Audio Radius 390's woofer is 10-inch whereas the Monitor Audio Radius 380 features a 8-inch woofer.
Frequency Response
Radius 390 and Radius 380 has exactly the same frequency range of 30-120 Hz.
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 Subwoofer class in our database.
Low Frequency
Subwoofer Speakers
High Frequency
Subwoofer Speakers
Cabinet Type
Both Monitor Audio Radius 390 and Monitor Audio Radius 380 have Passive Radiator type cabinets. Passive Radiator type subwoofers sports a non-powered cone that moves in response to the main woofer to move air out in order to generate stronger bass in a smaller body compared to ported or sealed designs.
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 Monitor Audio Radius 390's and Monitor Audio Radius 380's external dimensions. Monitor Audio Radius 390 has external dimensions of 348.0 x 331.0 x 385.0mm ( 13-11/16 x 13 x 15-1/8inch) whereas Monitor Audio Radius 380 has external dimensions of 308.0 x 291.0 x 345.0mm ( 12-1/8 x 11-7/16 x 13-9/16inch) .
Monitor Audio Radius 390 is clearly the larger of the two speakers. Its body is 40mm wider, 40mm taller and 40mm deeper than Monitor Audio Radius 380.
Below you can see the front view size comparison of Monitor Audio Radius 390 and Monitor Audio Radius 380 in scale.
Comparison image of Monitor Audio Radius 390 and Monitor Audio Radius 380 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 Monitor Audio Radius 390 is approximately 1274.4cm2 / 197.5inch2 and base area of the Monitor Audio Radius 380 is approximately 1004.0cm2 / 155.6inch2. The Radius 390 requires 27% more surface area than the Radius 380 which gives it a small disadvantage on placement in tight spaces.
Weight Comparison The weight of a subwoofer may become an important factor if you need to move and reposition the unit often to find the optimal positioning, also known as 'Subwoofer Crawling'. The Monitor Audio Radius 390 weighs 13.77kg / 30.3lbs and the Monitor Audio Radius 380 weighs 10.18kg / 22.4lbs. This makes the Radius 390 35% heavier than the Radius 380.
Here is a comparison of how Radius 390 and Radius 380's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of Monitor Audio Radius 390?
Here are the items that are included inside the box of Radius 390:
Powered sub6-feet AC power cord10.75-feet Mono minijack cableOwners ManualImportant Safety Instructions
What's in the Box of Monitor Audio Radius 380?
Here are the items that come with the Radius 380:
Powered sub6-feet AC power cord10.75-feet Mono minijack cableOwners ManualImportant Safety Instructions
 Woofer Size |
10 inches
vs
8 inches
|
Larger woofer |
 Height |
308mm
vs
348mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1004cm2
vs
1274cm2
|
Takes less floor space |
 Price per pair* |
875USD
vs
1150USD
|
costs less (*prices may change depending on the seller, location and time) |
| General |
Monitor Audio Radius 390 |
Monitor Audio Radius 380 |
| Brand |
Monitor Audio |
Monitor Audio |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
220 watts |
200 watts |
| Frequency Response |
30-120 Hz |
30-120 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
220-watt RMS |
200-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
10" |
8" |
| Woofer Composition |
C-CAM |
C-CAM |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
side |
side |
Physical Specs |
|
|
| Height |
348.0mm (13.7") |
308.0mm (12.1") |
| Width |
331.0mm (13") |
291.0mm (11.5") |
| Depth |
385.0mm (15.2") |
345.0mm (13.6") |
| Weight |
13.77kg (30.3lbs) |
10.18kg (22.4lbs) |
| Enclosure |
Passive Radiator |
Passive Radiator |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 Years |