In this review, we will be comparing two different types of speakers by JBL. JBL Summit Ama is a Bookshelf speaker whereas the Summit K2 is a Floor-standing speaker.
Let's have a brief look at the main features
of JBL Summit Ama and JBL Summit K2 first before getting into our more
detailed comparison.
| Key Specs | JBL Summit Ama | JBL Summit K2 |
|---|
| Brand | JBL
United States · founded 1946 | JBL
United States · founded 1946 |
|---|
| Design | 2-way | 3-way |
|---|
| Tweeter | 1.5" Compression Driver | 1.5" Compression Driver |
|---|
| Midrange | — | 10" |
|---|
| Woofer | 8" Hybrid Carbon Cellulose Composite (HC4) | 15" Hybrid Carbon Cellulose Composite (HC4) |
|---|
| Frequency response | 34-25k Hz | 24.6-23.5k Hz |
|---|
| Sensitivity | 84 dB | 92 dB |
|---|
| Impedance | 4 ohms | 4 ohms |
|---|
| Power range | 25-200 watts | 25-600 watts |
|---|
| Weight | 26.30kg / 57.9lbs | 108.40kg / 238.5lbs |
|---|
| Dimensions (H x W x D) | 18-3/4" x 12-1/8" x 13-1/4"
476.3 x 308.0 x 336.0mm | 50-3/8" x 25" x 18-1/16"
1280.2 x 635.3 x 458.7mm |
|---|
Summit Ama and Summit K2 are members of JBL's Summit series of speakers. Below you can find the loudspeakers from this series.
JBL Summit Series
History
What size room are the JBL Summit Ama and JBL Summit K2 speakers good for?
The size of the room in which you are planning to use these loudspeakers is an important decision
factor. Here we have compared their suitability to various sizes of environments considering their size
and max power parameters:
| Listening Environment* |
JBL Summit Ama |
JBL Summit K2 |
| Near-field |
Poor |
Are you nuts? |
| Small Room |
Average |
Poor |
| Mid-size Room |
Good |
Average |
| Large Room |
Average |
Good |
| Very Large Room |
Poor |
Good |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2,
Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: >
400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual
listening experience changes depending on floor height, room shape, surface materials, listening
position, speaker locations, etc.)
The sections below take each area in turn: drivers, frequency response, physical size and what you get in the box.
Drivers
One of the fundamental differences between these two speakers is that Summit Ama is a 2-way design whereas the Summit K2 is a 3-way speaker. 3-way designs utilize a midrange driver in addition to the tweeter and woofer on 2-way designs. Designing a crossover for a 3-way speaker is a complicated process and generally increases the overall cost of the speaker.
JBL Summit AmaJBL Summit K2
TweeterMidrangeWoofer
Front view, drawn to scale - cabinets and drivers share one scale, so sizes are directly comparable. Hover a driver for its size.
| Driver |
JBL Summit Ama |
JBL Summit K2 |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1.5-inch
|
1.5-inch
|
|
Midrange
|
- |
1 x 10-inch |
|
Woofer
|
1 x 8-inch
|
1 x 15-inch
|
Summit Ama features a 1.5" Teonex Compression Driver Tweeter and 1 x 8" Hybrid Carbon Cellulose Composite (HC4) Woofer with a Crossover frequency at 1600 Hz. On the other hand, the Summit K2 features a 1.5" Teonex Compression Driver Tweeter, a 10" Midrange and 1 x 15" Hybrid Carbon Cellulose Composite (HC4) Woofer with a Crossover frequency at 270 Hz / 1080 Hz.
Frequency Response
Summit Ama has a frequency range of 34-25k Hz whereas Summit K2 has a frequency range of 24.6-23.5k Hz. With a minimum frequency of 25Hz, the Summit K2 can go significantly deeper on the low side and provide stronger bass compared to the Summit Ama's min frequency of 34Hz.
The graph below depicts how these two speakers compare with the max, min and average Low Frequency values of other speakers in the Bookshelf class in our database.
Low Frequency
Bookshelf Speakers
Neither pair reaches down to 20Hz, the usual definition of full-range, which is normal for speakers of this size. If you want the bottom octave for movies or bass-heavy music, add a subwoofer to whichever you choose. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
Summit Ama and Summit K2 have the same Impedance of 4 ohms but where they differ is the sensitivity levels. Summit Ama sensitivity is rated at 84 dB and the Summit K2's is at 92 dB. This 8 dB difference makes the JBL Summit K2 a more sensitive speaker compared to JBL Summit Ama, hence will play louder with the same amount of watts.
One thing to keep in mind that the lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit comared to higher impedance speakers especially at high volume levels, so make sure the amp you pair with the Summit Ama and the Summit Ama can provide this impedance level.
Sensitivity
Bookshelf Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. Staying
within that range gives nominal performance; driving the speaker beyond its maximum wattage can damage it.
Summit K2 can handle a max power of 600 watts RMS, whereas Summit Ama has a max power handling value of 200 watts RMS, 400 watts less than the Summit K2.
Note that higher power handling does not make a speaker louder: that depends mainly on
sensitivity and impedance. The calculator below shows how loud each of these actually plays
on a real amplifier.
Which plays louder on your amplifier?
Starting with a popular amplifier - change it to the one you own, or any you are
considering, and watch both numbers move.
Input Type and Bi-Amping / Bi-Wiring
Both Summit Ama and Summit K2 features dual binding post speaker terminals for bi-amping or bi-wiring.
Cabinet Type and Port Position
Both Summit Ama and Summit K2 have rear firing ports. Rear ported speakers generally need more room between the backside of the speaker and the wall compared to sealed and front/bottom ported speakers. Placing the speakers too close to the walls may cause the bass to sound boomy.
If you are limited in space and can't get the speakers away from the backwall, check our Speakers with Front Firing Ports page.
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 JBL Summit Ama's and JBL Summit K2's external dimensions. JBL Summit Ama has external dimensions of 476.3 x 308.0 x 336.0mm (18-3/4 x 12-1/8 x 13-1/4inch) whereas JBL Summit K2 has external dimensions of 1280.2 x 635.3 x 458.7mm (50-3/8 x 25 x 18-1/16inch).
JBL Summit K2 is clearly the larger of the two speakers. Its body is 327.3mm wider, 803.9mm taller and 122.7mm deeper than JBL Summit Ama.
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.
JBL Summit K2 needs about 182% more floor or shelf area. JBL Summit K2 is 123mm deeper, so it stands that much further out from the wall. JBL Summit K2 is 804mm 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 JBL Summit Ama is approximately 1034.9cm2 / 160.4inch2 and base area of the JBL Summit K2 is approximately 2914.1cm2 / 451.7inch2. The Summit Ama requires 64% less surface area than the Summit K2 which gives it a small advantage on placement in tight spaces.