In this review, we will be comparing Stratton 12 and A120P, two Powered Subwoofer speakers from KLH 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 KLH Stratton 12 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.KLH Stratton 12and JBL Stage A120P have the same driver set up: Both subwoofers have 1 x 12" drivers.
Frequency Response
Stratton 12 has a frequency range of 25-160 Hz whereas A120P has a frequency range of 32-150 Hz. With a minimum frequency of 25Hz, the Stratton 12 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
Cabinet Type
The KLH Stratton 12 has a Bass Reflex type cabinet. Bass Reflex type subwoofers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs. On the other hand the JBL Stage A120P have Bass reflex type enclosure.
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 KLH Stratton 12's and JBL Stage A120P's external dimensions. KLH Stratton 12 has external dimensions of 450.0 x 391.0 x 518.0mm (17-11/16inch x 15-3/8inch x 20-3/8inch) 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 35mm shorter and 43mm less deeper than KLH Stratton 12 but it is also 2mm wider.
Below you can see the front view size comparison of KLH Stratton 12 and JBL Stage A120P in scale.
Comparison image of KLH Stratton 12 and JBL Stage A120P 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 KLH Stratton 12 is approximately 2025.4cm2 / 313.9inch2 and base area of the JBL Stage A120P is approximately 1866.8cm2 / 289.4inch2. The Stratton 12 requires 8% 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 KLH Stratton 12 weighs 20.00kg / 44lbs and the JBL Stage A120P weighs 18.68kg / 41.1lbs. This makes the Stratton 12 7% heavier than the A120P.
Here is a comparison of how Stratton 12 and A120P's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
What's in the Box of KLH Stratton 12?
Here are the items that are included inside the box of Stratton 12:
- Powered subwoofer
- 6-feet AC power cord
- Grille
- Manual
What's in the Box of JBL Stage A120P?
Here are the items that come with the A120P:
- Powered subwoofer
- Grille
- 6-feet AC power cord
- 4 Spike feet
- Owners Manual
- Warranty Card
- Important Safety Instructions
 Low Frequency Response |
25 Hz
vs
32 Hz
|
Generates deeper bass |
 High Frequency Response |
160 Hz
vs
150 Hz
|
Generates higher frequency |
 Height |
415mm
vs
450mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
1866cm2
vs
2025cm2
|
Takes less floor space |
 Price per pair* |
300USD
vs
599USD
|
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.
KLH Stratton 12 needs about 8% more floor area. KLH Stratton 12 stands 43mm further into the room. KLH Stratton 12 is 35mm taller.
| General |
KLH Stratton 12 |
JBL Stage A120P |
| Brand |
KLH |
JBL |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
200 watts |
250 watts |
| Frequency Response |
25-160 Hz |
32-150 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
200-watt RMS |
250-watt RMS |
| Watts Peak (Max) |
n/a |
500-watt RMS |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
12" |
12" |
| Woofer Composition |
Paper/Kevlar/Fiberglass |
Polycellulose |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
450.0mm (17.7") |
415.0mm (16.3") |
| Width |
391.0mm (15.4") |
393.0mm (15.5") |
| Depth |
518.0mm (20.4") |
475.0mm (18.7") |
| Weight |
20.00kg (44lbs) |
18.68kg (41.1lbs) |
| Enclosure |
Bass Reflex |
Bass reflex |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
2 Years |
1 Year |
| Labor Warranty |
2 Years |
1 Year |
Different price classes - KLH Stratton 12 costs roughly 2x what JBL Stage A120P does. Before paying it, read the note below about two smaller subwoofers.
| Area | Better | Why |
|---|
| Bass depth | A | KLH Stratton 12 goes deeper - 25Hz against 32Hz. That gap covers the lowest notes of a five-string bass and a concert bass drum. |
| Amplifier power | B | JBL Stage A120P has the bigger amplifier - 250W against 200W RMS, about 1dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | evenly matched | Near-identical radiating area (12" against 12"). |
| Enclosure | evenly matched | Both are ported designs, so they roll off in much the same way. |
| Warranty | A | KLH Stratton 12 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 $599, about 50% less. |
A KLH Stratton 12 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?
KLH Stratton 12 is ahead, but on only 1 of the measured areas, and it costs about 100% more. JBL Stage A120P is the sensible buy unless your room is large enough to need the extra. 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 $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.