In this review, we will be comparing Black TreVoce 12 PRO and A120P, two Powered Subwoofer speakers from OSD and JBL. 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 JBL Stage A120P 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 PROand JBL Stage A120P have the same driver set up: Both subwoofers have 1 x 12" drivers.
Frequency Response
Black TreVoce 12 PRO has a frequency range of 18-250 Hz whereas A120P has a frequency range of 32-150 Hz. With a minimum frequency of 18Hz, the Black TreVoce 12 PRO can go significantly deeper on the low side and provide stronger bass compared to the A120P's min frequency of 32Hz.
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 JBL Stage A120P's external dimensions. OSD Black TreVoce 12 PRO has external dimensions of 450.9 x 404.8 x 473.1mm () whereas JBL Stage A120P has external dimensions of 415.0 x 393.0 x 475.0mm (16-5/16 x 15-7/16 x 18-11/16inch).
JBL Stage A120P is 11.8mm narrower and 35.9mm shorter than OSD Black TreVoce 12 PRO but it is also 1.9mm deeper.
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.
Near-identical footprints. OSD Black TreVoce 12 PRO is 36mm 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 JBL Stage A120P is approximately 1866.8cm2 / 289.4inch2. The Black TreVoce 12 PRO requires 3% more surface area than the A120P 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 JBL Stage A120P weighs 18.68kg / 41.1lbs. This makes the Black TreVoce 12 PRO 13% heavier than the A120P.
Here is a comparison of how Black TreVoce 12 PRO and A120P's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Low Frequency Response |
18 Hz
vs
32 Hz
|
Generates deeper bass |
 High Frequency Response |
250 Hz
vs
150 Hz
|
Generates higher frequency |
 Height |
415mm
vs
450mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1866cm2
vs
1915cm2
|
Takes less floor space |
 Price per pair* |
300USD
vs
800USD
|
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.
Near-identical footprints. OSD Black TreVoce 12 PRO is 36mm taller.
| General |
OSD Black TreVoce 12 PRO |
JBL Stage A120P |
| Brand |
OSD |
JBL |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Frequency Response |
18-250 Hz |
32-150 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
300-watt RMS |
250-watt RMS |
| Watts Peak (Max) |
800-watt RMS |
500-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
12" |
12" |
| Woofer Composition |
|
Polycellulose |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
n/a |
front |
Physical Specs |
|
|
| Height |
450.9mm (17.8") |
415.0mm (16.3") |
| Width |
404.8mm (15.9") |
393.0mm (15.5") |
| Depth |
473.1mm (18.6") |
475.0mm (18.7") |
| Weight |
21.09kg (46.4lbs) |
18.68kg (41.1lbs) |
| Enclosure |
|
Bass reflex |
| Grille |
n/a |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
1 Year |
| Labor Warranty |
2 Years |
1 Year |
A passive radiator subwoofer against a ported 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 Black TreVoce 12 PRO goes deeper - 18Hz against 32Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | evenly matched | Much the same amplifier (300W vs 250W RMS) - under 1dB apart. |
| Driver area | evenly matched | Near-identical radiating area (12" against 12"). |
| 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; JBL Stage A120P is ported - a ported box gives more output low down for its size, at the cost of a steeper roll-off below tuning. Neither is better in the abstract; ported tends to suit films and sealed tends to suit music, and both generalisations have exceptions. |
| Warranty | A | OSD Black TreVoce 12 PRO carries 2 years on parts against 1 years. A subwoofer amplifier works harder than anything else in the system, so this is not a throwaway line. |
| Price | B | JBL Stage A120P costs less - $300 against $800, about 63% less. |
A OSD Black TreVoce 12 PRO B JBL Stage A120P
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?
The usual trade-off: OSD Black TreVoce 12 PRO measures better, JBL Stage A120P costs about 63% less. In a normal room, placement will make a bigger difference than the gap between these two. 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 JBL Stage A120P cost about $600 against $800 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.