In this review, we will be comparing RP-1400SW and R-121SW, two Powered Subwoofer speakers by Klipsch. 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 Klipsch RP-1400SW and Klipsch R-121SW 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 Klipsch RP-1400SWand Klipsch R-121SW have a single woofer setup however the Klipsch RP-1400SW's woofer is 14-inch whereas the Klipsch R-121SW features a 12-inch woofer.
Frequency Response
RP-1400SW has a frequency range of 16-141 Hz whereas R-121SW has a frequency range of 28-120 Hz. With a minimum frequency of 16Hz, the RP-1400SW can go significantly deeper on the low side and provide stronger bass compared to the R-121SW's min frequency of 28Hz.
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 Klipsch RP-1400SW and Klipsch R-121SW have Bass Reflex type cabinets. 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.
Klipsch R-121SW Port
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 Klipsch RP-1400SW's and Klipsch R-121SW's external dimensions. Klipsch RP-1400SW has external dimensions of 542.0 x 508.0 x 653.0mm (21-5/16inch x 20inch x 25-11/16inch) whereas Klipsch R-121SW has external dimensions of 423.0 x 407.0 x 532.0mm (16-5/8inch x 16inch x 20-15/16inch).
Klipsch RP-1400SW is clearly the larger of the two speakers. Its body is 101mm wider, 119mm taller and 121mm deeper than Klipsch R-121SW.
Below you can see the front view size comparison of Klipsch RP-1400SW and Klipsch R-121SW in scale.
Comparison image of Klipsch RP-1400SW and Klipsch R-121SW 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 Klipsch RP-1400SW is approximately 3317.2cm2 / 514.2inch2 and base area of the Klipsch R-121SW is approximately 2165.2cm2 / 335.6inch2. The RP-1400SW requires 53% more surface area than the R-121SW 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 Klipsch RP-1400SW weighs 38.05kg / 83.7lbs and the Klipsch R-121SW weighs 16.00kg / 35.2lbs. This makes the RP-1400SW 138% heavier than the R-121SW.
Here is a comparison of how RP-1400SW and R-121SW's weights compare with the average, max and min weights in Powered Subwoofer class.
Weight
All Subwoofer Speakers
 Woofer Size |
14 inches
vs
12 inches
|
Larger woofer |
| Low Frequency Response |
16 Hz
vs
28 Hz
|
Generates deeper bass |
 High Frequency Response |
141 Hz
vs
120 Hz
|
Generates higher frequency |
 Wireless Operation |
Optional
vs
No
|
Connect your subwoofer to your system wireless |
 Height |
423mm
vs
542mm
|
Easier to fit in smaller spaces |
 Base Surface Area |
2165cm2
vs
3317cm2
|
Takes less floor space |
 Price per pair* |
599USD
vs
1550USD
|
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.
Klipsch RP-1400SW needs about 53% more floor area. Klipsch RP-1400SW stands 121mm further into the room. Klipsch RP-1400SW is 119mm taller.
| General |
Klipsch Reference Premiere RP-1400SW |
Klipsch Reference R-121SW |
| Brand |
Klipsch |
Klipsch |
| Speaker Type |
Powered Subwoofer |
Powered Subwoofer |
| Max Amplifier Output |
500 watts |
200 watts |
| Frequency Response |
16-141 Hz |
28-120 Hz |
Amplifier |
|
|
| Watts RMS (Continuous) |
500-watt RMS |
200-watt RMS |
| Watts Peak (Max) |
1000-watt RMS |
n/a |
Drivers |
|
|
| Woofer Quantity |
1 |
1 |
| Woofer Size |
14" |
12" |
| Woofer Composition |
Cerametallic |
Spun-Copper TCP |
| Tweeter Size |
- |
- |
| Aimable Tweeter |
No |
No |
| Midrange Driver |
No |
No |
| Firing Direction |
front |
front |
Physical Specs |
|
|
| Height |
542.0mm (21.3") |
423.0mm (16.7") |
| Width |
508.0mm (20") |
407.0mm (16") |
| Depth |
653.0mm (25.7") |
532.0mm (20.9") |
| Weight |
38.05kg (83.7lbs) |
16.00kg (35.2lbs) |
| Enclosure |
Bass Reflex |
Bass Reflex |
| Finish |
MDF with Vinyl |
n/a |
| Available Colors |
Ebony |
n/a |
| Grille |
Yes |
Yes |
| Moisture Resistancy |
No |
No |
Connections |
|
|
Other |
|
|
| Parts Warranty |
5 years |
2 Years |
| Labor Warranty |
5 years |
2 Years |
Different price classes - Klipsch RP-1400SW costs roughly 2.6x what Klipsch R-121SW does. Before paying it, read the note below about two smaller subwoofers.
| Area | Better | Why |
|---|
| Bass depth | A | Klipsch RP-1400SW goes deeper - 16Hz against 28Hz. Under 20Hz is felt more than heard - the bottom of a pipe organ and the bottom of a film mix. |
| Amplifier power | A | Klipsch RP-1400SW has the bigger amplifier - 500W against 200W RMS, about 4dB more on tap. In a large room that is headroom before the DSP starts limiting. |
| Driver area | A | Klipsch RP-1400SW moves more air: 14" against 12" is 1.36x the cone area, not the 1.17x the diameters suggest. More area means the same output with less excursion, and less distortion with it. |
| Enclosure | evenly matched | Both are ported designs, so they roll off in much the same way. |
| Wireless option | depends | Only Klipsch RP-1400SW offers a wireless link (as a paid option). It decides where the sub can go if you cannot run a cable, and is worth nothing if you can. |
| Cabinet size | depends | Klipsch R-121SW is about 49% 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 | A | Klipsch RP-1400SW carries 5 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 | Klipsch R-121SW costs less - $599 against $1,550, about 61% less. |
A Klipsch RP-1400SW B Klipsch R-121SW
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: Klipsch RP-1400SW measures better, Klipsch R-121SW costs about 61% 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 $599 each, two Klipsch R-121SW cost about $1,198 against $1,550 for one of the other, which is worth a thought. If placement is the constraint - a corner, behind a sofa, under a desk - Klipsch R-121SW is the one that will actually go there, and a well-placed small subwoofer beats a badly-placed big one every time.
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.