In this review, we will be comparing Black TreVoce 12 PRO and KC62, two Powered Subwoofer speakers from OSD and KEF. 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 Black TreVoce 12 PRO and KEF KC62 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.OSD Black TreVoce 12 PRO and KEF KC62 have a totally different setup: the OSD Black TreVoce 12 PRO features 1 x 12-inch drivers whereas the KC62 features 2 x 6.5-inch drivers.
Frequency Response
Black TreVoce 12 PRO has a frequency range of 18-250 Hz whereas KC62 has a frequency range of 11-200 Hz. With a minimum frequency of 11Hz, the KC62 can go significantly deeper on the low side and provide stronger bass compared to the Black TreVoce 12 PRO's min frequency of 18Hz.
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 Black TreVoce 12 PRO's and KEF KC62's external dimensions. OSD Black TreVoce 12 PRO has external dimensions of 450.9 x 404.8 x 473.1mm () whereas KEF KC62 has external dimensions of 245.0 x 258.0 x 281.0mm (9-5/8inch x 10-1/8inch x 11-1/16inch).
OSD Black TreVoce 12 PRO is clearly the larger of the two speakers. Its body is 146.8mm wider, 205.9mm taller and 192.1mm deeper than KEF KC62.
Size, drawn to scale
Both speakers 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 surface and pushed back to the same wall, so the deeper one visibly sticks out further.
OSD Black TreVoce 12 PRO needs about 164% more floor or shelf area. OSD Black TreVoce 12 PRO is 192mm deeper, so it stands that much further out from the wall. OSD Black TreVoce 12 PRO is 206mm taller.
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 Black TreVoce 12 PRO is approximately 1915.1cm2 / 296.8inch2 and base area of the KEF KC62 is approximately 725.0cm2 / 112.4inch2. The Black TreVoce 12 PRO requires 164% more surface area than the KC62 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 Black TreVoce 12 PRO weighs 21.09kg / 46.4lbs and the KEF KC62 weighs 14.05kg / 30.9lbs. This makes the Black TreVoce 12 PRO 50% heavier than the KC62.
Here is a comparison of how Black TreVoce 12 PRO and KC62's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
12 inches
vs
6.5 inches
|
Larger woofer |
 High Frequency Response |
250 Hz
vs
200 Hz
|
Generates higher frequency |
 Price per pair* |
800USD
vs
1500USD
|
costs less (*prices may change depending on the seller, location and time) |
| Number of Woofers |
2
vs
1
|
More woofers |
| Low Frequency Response |
11 Hz
vs
18 Hz
|
Generates deeper bass |
 Height |
245mm
vs
450mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
725cm2
vs
1915cm2
|
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 Black TreVoce 12 PRO needs about 164% more floor area. OSD Black TreVoce 12 PRO stands 192mm further into the room. OSD Black TreVoce 12 PRO is 206mm taller.
| General |
OSD Black TreVoce 12 PRO |
KEF KC62 |
| Brand |
OSD |
KEF |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Frequency Response |
18-250 Hz |
11-200 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
1000-watt RMS |
| Watts Peak (Max) |
800-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
2 |
| Woofer Size |
12" |
6.5" |
| Woofer Composition |
|
|
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
n/a |
side |
Physical Specs |
|
|
| Height |
450.9mm (17.8") |
245.0mm (9.6") |
| Width |
404.8mm (15.9") |
258.0mm (10.2") |
| Depth |
473.1mm (18.6") |
281.0mm (11.1") |
| Weight |
21.09kg (46.4lbs) |
14.05kg (30.9lbs) |
| Enclosure |
|
Acoustic Suspension |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
2 Years |
| Labor Warranty |
2 Years |
2 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 | B | KEF KC62 goes deeper - 11Hz against 18Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | B | KEF KC62 has the bigger amplifier - 1000W against 300W RMS, about 5.2dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | OSD Black TreVoce 12 PRO moves more air: 12" against 2 x 6.5" is 1.7x the cone area, not the 1.31x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | depends | OSD Black TreVoce 12 PRO is passive radiator - a passive radiator behaves like a port without the pipe noise, and suits a slim cabinet; KEF KC62 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 | KEF KC62 is about 79% 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. |
| Price | A | OSD Black TreVoce 12 PRO costs less - $800 against $1,500, about 47% less. |
A OSD Black TreVoce 12 PRO B KEF KC62
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?
KEF KC62 is ahead, but on only 1 of the measured areas, and it costs about 88% more. OSD Black TreVoce 12 PRO is the sensible buy unless your room is large enough to need the extra. Films or music? If this is mainly a home cinema, OSD Black TreVoce 12 PRO will hit harder for the money; if it is mainly for music in a normal-sized room, KEF KC62 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 $800 each, two OSD Black TreVoce 12 PRO cost about $1,600 against $1,500 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.