In this review, we will be comparing Nero DueVoce DualX8 and TZero MKIII, two Powered Subwoofer speakers from OSD and REL. 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 OSD Nero DueVoce DualX8 and REL TZero MKIII 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.Both OSD Nero DueVoce DualX8and REL TZero MKIII have a single woofer setup however the OSD Nero DueVoce DualX8's woofer is 8-inch whereas the REL TZero MKIII features a 6.5-inch woofer.
Frequency Response
Nero DueVoce DualX8 has a frequency range of 17-165 Hz whereas TZero MKIII has a frequency range of 37-120 Hz. With a minimum frequency of 17Hz, the Nero DueVoce DualX8 can go significantly deeper on the low side and provide stronger bass compared to the TZero MKIII's min frequency of 37Hz.
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
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 OSD Nero DueVoce DualX8's and REL TZero MKIII's external dimensions. OSD Nero DueVoce DualX8 has external dimensions of 311.2 x 265.1 x 333.4mm () whereas REL TZero MKIII has external dimensions of 242.9 x 217.5 x 295.3mm ().
OSD Nero DueVoce DualX8 is clearly the larger of the two speakers. Its body is 47.6mm wider, 68.3mm taller and 38.1mm deeper than REL TZero MKIII.
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 OSD Nero DueVoce DualX8 is approximately 883.8cm2 / 137.0inch2 and base area of the REL TZero MKIII is approximately 642.3cm2 / 99.6inch2. The Nero DueVoce DualX8 requires 38% more surface area than the TZero MKIII 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 OSD Nero DueVoce DualX8 weighs 7.80kg / 17.2lbs and the REL TZero MKIII weighs 6.80kg / 15lbs. This makes the Nero DueVoce DualX8 15% heavier than the TZero MKIII.
Here is a comparison of how Nero DueVoce DualX8 and TZero MKIII's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
8 inches
vs
6.5 inches
|
Larger woofer |
| Low Frequency Response |
17 Hz
vs
37 Hz
|
Generates deeper bass |
 High Frequency Response |
165 Hz
vs
120 Hz
|
Generates higher frequency |
 Price per pair* |
300USD
vs
599USD
|
costs less (*prices may change depending on the seller, location and time) |
 Height |
242mm
vs
311mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
642cm2
vs
883cm2
|
Takes less floor space |
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.
OSD Nero DueVoce DualX8 needs about 38% more floor area. OSD Nero DueVoce DualX8 stands 38mm further into the room. OSD Nero DueVoce DualX8 is 68mm taller.
| General |
OSD Nero DueVoce DualX8 |
REL TZero MKIII |
| Brand |
OSD |
REL |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Frequency Response |
17-165 Hz |
37-120 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
130-watt RMS |
100-watt RMS |
| Watts Peak (Max) |
300-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
8" |
6.5" |
| Woofer Composition |
|
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
Physical Specs |
|
|
| Height |
311.2mm (12.3") |
242.9mm (9.6") |
| Width |
265.1mm (10.4") |
217.5mm (8.6") |
| Depth |
333.4mm (13.1") |
295.3mm (11.6") |
| Weight |
7.80kg (17.2lbs) |
6.80kg (15lbs) |
| Enclosure |
|
|
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
3 Years |
| Labor Warranty |
2 Years |
3 Years |
A passive radiator subwoofer against a sealed one. That is the most consequential line on this page: it decides how the bass rolls off, how it behaves in a small room, and how much output you get for the size of the box.
| Area | Better | Why |
|---|
| Bass depth | A | OSD Nero DueVoce DualX8 goes deeper - 17Hz against 37Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | A | OSD Nero DueVoce DualX8 has the bigger amplifier - 130W against 100W RMS, about 1.1dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | OSD Nero DueVoce DualX8 moves more air: 8" against 6.5" is 1.51x the cone area, not the 1.23x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | OSD Nero DueVoce DualX8 is passive radiator - a passive radiator behaves like a port without the pipe noise, and suits a slim cabinet; REL TZero MKIII is sealed - a sealed box rolls off gently and is usually the easier one to integrate in a small or awkward room. Neither is better in the abstract; ported tends to suit films and sealed tends to suit music, and both generalisations have exceptions. |
| Cabinet size | depends | REL TZero MKIII is about 43% smaller by volume. In a subwoofer that is a real trade rather than a preference: box volume is how you get output low down without a bigger amplifier. |
| Warranty | B | REL TZero MKIII 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 | A | OSD Nero DueVoce DualX8 costs less - $300 against $599, about 50% less. |
A OSD Nero DueVoce DualX8 B REL TZero MKIII
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?
OSD Nero DueVoce DualX8 is the easier recommendation: it leads on most of the measured areas and costs less. Take REL TZero MKIII if one of the "depends" rows describes your room. Films or music? If this is mainly a home cinema, OSD Nero DueVoce DualX8 will hit harder for the money; if it is mainly for music in a normal-sized room, REL TZero MKIII is usually the easier one to make sound right. Two small subwoofers beat one big one in most rooms - a pair evens out the room modes in a way no single box can, whatever its specs. At $300 each, two OSD Nero DueVoce DualX8 cost about $600 against $599 for one of the other, which is worth a thought.
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.