In this review, we will be comparing Radius 380 and SuperCube 4000, two Powered Subwoofer speakers from Monitor Audio and Definitive Technology. 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 380 and DT SuperCube 4000 first before getting into our more detailed comparison.
The sections below take each area in turn: driver and amplifier, frequency response, physical size and connectivity.
Drivers
The efficiency of a subwoofer is directly proportional to the total radiating are squared hence the woofer quantity and diameter.Monitor Audio Radius 380and DT SuperCube 4000 have the same driver set up: Both subwoofers have 1 x 8" drivers.
Frequency Response
Radius 380 has a frequency range of 30-120 Hz whereas SuperCube 4000 has a frequency range of 16-200 Hz. With a minimum frequency of 16Hz, the SuperCube 4000 can go significantly deeper on the low side and provide stronger bass compared to the Radius 380's min frequency of 30Hz.
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 380 and DT SuperCube 4000 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
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 Monitor Audio Radius 380's and DT SuperCube 4000's external dimensions. 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) whereas DT SuperCube 4000 has external dimensions of 302.0 x 281.0 x 318.0mm (11-7/8 x 11-1/16 x 12-1/2inch).
Monitor Audio Radius 380 is clearly the larger of the two speakers. Its body is 10mm wider, 6mm taller and 27mm deeper than DT SuperCube 4000.
Below you can see the front view size comparison of Monitor Audio Radius 380 and DT SuperCube 4000 in scale.
Comparison image of Monitor Audio Radius 380 and DT SuperCube 4000 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 380 is approximately 1004.0cm2 / 155.6inch2 and base area of the DT SuperCube 4000 is approximately 893.6cm2 / 138.5inch2. The Radius 380 requires 12% more surface area than the SuperCube 4000 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 380 weighs 10.18kg / 22.4lbs and the DT SuperCube 4000 weighs 11.36kg / 25lbs. This makes the SuperCube 4000 12% heavier than the Radius 380.
Here is a comparison of how Radius 380 and SuperCube 4000'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 380?
Here are the items that are included inside the box of Radius 380:
- Powered sub
- 6-feet AC power cord
- 10.75-feet Mono minijack cable
- Owners Manual
- Important Safety Instructions
What's in the Box of DT SuperCube 4000?
Here are the items that come with the SuperCube 4000:
- 8-inch Powered subwoofer
- 7-feet AC power cord
- Remote control (CR2025 battery installed)
- 4 Threaded rubber-feet
- 4 Spike feet (hex-nut attached)
- Owners Manual
- SC4000 Booklet
 Low Frequency Response |
16 Hz
vs
30 Hz
|
Generates deeper bass |
 High Frequency Response |
200 Hz
vs
120 Hz
|
Generates higher frequency |
 Height |
302mm
vs
308mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
893cm2
vs
1004cm2
|
Takes less floor space |
 Price per pair* |
799USD
vs
875USD
|
costs less (*prices may change depending on the seller, location and time) |
Size, drawn to scale
Both subwoofers and both views share one scale, so everything here is directly comparable. Hover a box for its dimensions.
One scale for both, standing on the same floor and pushed back to the same wall, so the bigger one visibly takes more of the room.
Monitor Audio Radius 380 needs about 12% more floor area. Monitor Audio Radius 380 stands 27mm further into the room.
| General |
Monitor Audio Radius 380 |
Definitive Technology SuperCube 4000 |
| Brand |
Monitor Audio |
Definitive Technology |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
200 watts |
1200 watts |
| Frequency Response |
30-120 Hz |
16-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
1200-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
8" |
| Woofer Composition |
C-CAM |
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Crossover Frequency |
n/a |
40-150 Hz and 40-150 Hz |
| Firing Direction |
side |
front |
Physical Specs |
|
|
| Height |
308.0mm (12.1") |
302.0mm (11.9") |
| Width |
291.0mm (11.5") |
281.0mm (11.1") |
| Depth |
345.0mm (13.6") |
318.0mm (12.5") |
| Weight |
10.18kg (22.4lbs) |
11.36kg (25lbs) |
| Enclosure |
Passive Radiator |
Passive Radiator |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
3 Years |
| Labor Warranty |
2 Years |
3 Years |
No single best subwoofer here. Your room, where the box can physically go, and whether this is mainly for films or mainly for music will settle it long before the specs do.
| Area | Better | Why |
|---|
| Bass depth | B | DT SuperCube 4000 goes deeper - 16Hz against 30Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | B | DT SuperCube 4000 has the bigger amplifier - 1200W against 200W RMS, about 7.8dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | evenly matched | Near-identical radiating area (8" against 8"). |
| Enclosure | evenly matched | Both are passive radiator designs, so they roll off in much the same way. |
| Speaker-level inputs | B | DT SuperCube 4000 takes a speaker-level connection as well as line level. That is what lets it work with an integrated amplifier or a vintage receiver that has no subwoofer output at all. |
| Driver placement | depends | Monitor Audio Radius 380 fires side and DT SuperCube 4000 fires front. A down-firing driver is more forgiving of a grille-less look and of a hard floor; a front-firing one is the safer choice on a thick carpet or a suspended timber floor. |
| Warranty | B | DT SuperCube 4000 carries 3 years on parts against 2 years. A subwoofer amplifier works harder than anything else in the system, so this is not a throwaway line. |
| Price | B | DT SuperCube 4000 costs less - $799 against $875, about 9% less. |
A Monitor Audio Radius 380 B DT SuperCube 4000
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 subwoofers are judged; anything missing on either side is left out rather than guessed.
Which should you choose?
DT SuperCube 4000 has the edge on paper, though not by much. The "depends" rows are more likely to decide this than the score is. Check your amplifier first: if it has no subwoofer or preamp output, DT SuperCube 4000 is the only one of these two you can connect at all.
One thing outweighs everything above: where the subwoofer stands. Room modes can add or remove 10dB or more at a given seat, which is far larger than any difference on this page. Before spending more, try the sub in two or three positions - the crawl test, where you put it in the listening seat and crawl the room to find where the bass sounds best, costs nothing and usually beats an upgrade.