In this review, we will be comparing Motion 20i and BP-9020, two Passive Floor-standing speakers from MartinLogan and Definitive Technology.
Let's have a brief look at the main features
of MartinLogan 20i and Definitive BP-9020 first before getting into our more
detailed comparison.
MartinLogan 20i Key Specs
- 2-way Design
- 1.0 x 1.4" Folded Motion Tweeter
- 2 x 5.5" Aluminum Woofer
- 46-25k Hz Frequency Response
- 90 dB Sensitivity
- Impedance: 4ohms
- Power Range:20-200watts
- Weight:15.00kg
- Dimensions (H x W x D): 905.0" x 6-7/8" x 12-1/16"( 905.0 x 175.0 x 307.0mm )
Definitive BP-9020 Key Specs
- 3-way Design
- 1" dome Tweeter
- 3.5" Midrange
- 8" Polypropelene Woofer
- 3.5" Midrange
- 28-40k Hz Frequency Response
- 92 dB Sensitivity
- Impedance: 8ohms
- Power Range:50-200watts
- Weight:13.64kg
- Dimensions (H x W x D): 904.0" x 11-1/16" x 13-13/16"( 904.0 x 281.0 x 351.0mm )
What size room are the MartinLogan 20i and Definitive BP-9020 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* |
MartinLogan 20i |
Definitive BP-9020 |
| Near-field |
Bad |
Bad |
| Small Room |
Poor |
Poor |
| Mid-size Room |
Good |
Average |
| Large Room |
Good |
Good |
| Very Large Room |
Poor |
Average |
(* 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.)
In the following sections, we will get into more detail in order to better understand how the MartinLogan 20i and Definitive BP-9020 compare and hopefully end up with enough arguments to decide which one of these loudspeakers is the better choice for you.
**This post contains affiliate links, and I will be compensated if you make a purchase after clicking
through my links. As an Amazon Associate I earn from qualifying purchases.
Drivers
One of the fundamental differences between these two speakers is that Motion 20i is a 2-way design whereas the BP-9020 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.
| Driver |
MartinLogan 20i |
Definitive BP-9020 |
|
Driver Setup
|
2-way
|
3-way
|
|
Tweeter
|
1.0 x 1.4-inch
|
1-inch
|
|
Midrange
|
- |
3 x 3.5-inch |
|
Woofer
|
2 x 5.5-inch
|
1 x 8-inch
|
Motion 20i features a 1.0 x 1.4" Folded Motion Tweeter and 2 x 5.5" Aluminum Woofer with a Crossover frequency at 500Hz and 2600Hz. On the other hand, the BP-9020 features a 1" annealed aluminum dome Tweeter , a 3.5" Midrange and 1 x 8" Polypropelene Woofer .
Frequency Response
Motion 20i has a frequency range of 46-25k Hz whereas BP-9020 has a frequency range of 28-40k Hz. With a minimum frequency of 28Hz, the BP-9020 can go significantly deeper on the low side and provide stronger bass compared to the Motion 20i's min frequency of 46Hz.
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 Floor-standing class in our database.
Low Frequency
Floor-standing Speakers
High Frequency
Floor-standing Speakers
None of these speakers achieves full range experience which is commonly agreed as 20Hz-20kHz. In order to achieve lower lows / deeper bass, we recommend you pair these with a subwoofer. Visit our Powered Subwoofers section to find out more about the available options.
Impedance and Sensitivity
Motion 20i is a 4 ohms speaker compared to the BP-9020 which has a nominal impedance of 8 ohms. Lower impedance speakers, especially the ones that are rated at 4 ohms may put more pressure on the amplifier unit especially when played at high volume levels, so make sure the amp you pair with the Motion 20i can provide this impedance level.
These two speakers also have different sensitivity levels. Motion 20i sensitivity is rated at 90 dB and the BP-9020's is rated at 92 dB. This 2 dB difference makes the Definitive BP-9020 a more sensitive speaker compared to MartinLogan 20i, hence will play louder with the same amount of watts.
Sensitivity
Floor-standing Speakers
Power Range
Power
range is the range of input power in watts RMS that a loudspeaker is designed to handle. While using
an amplifier within this range ensures the nominal performance , inputting a power that is higher than the
max wattage can result in a damaged speaker.
Keep in mind that a higher max power handling value doesn't necessarily make that a louder speaker
compared to a lower max handling speaker. Loudness or the sound level is also impacted by parameters
such as Impedance, sensitivity and system efficiencies.
Input Type and Bi-Amping / Bi-Wiring
Motion 20i features Custom 5-way bi-wire tool-less binding posts posts which make bi-amping or bi-wiring possible. BP-9020 has a 5-Way post, RCA which doesn't feature bi-amping/bi-wiring.
MartinLogan 20i's Custom 5-way bi-wire tool-less binding posts terminals allows Bi-amping or bi-wiring
Physical Specs
Size of a speaker can sometimes become an important decision factor due to space constraints or in some cases purely for esthetic reasons. In this section, we are going to compare MartinLogan 20i's and Definitive BP-9020's external dimensions. MartinLogan 20i has external dimensions of 905.0 x 175.0 x 307.0mm ( 35-5/8 x 6-7/8 x 12-1/16inch) whereas Definitive BP-9020 has external dimensions of 904.0 x 281.0 x 351.0mm ( 35-9/16 x 11-1/16 x 13-13/16inch) .
MartinLogan 20i is 106mm narrower and 44mm less deeper than Definitive BP-9020 but it is also 1mm 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 MartinLogan 20i is approximately 537.3cm2 / 83.3inch2 and base area of the Definitive BP-9020 is approximately 986.3cm2 / 152.9inch2. The Motion 20i requires 46% less surface area than the BP-9020 which gives it a small advantage on placement in tight spaces.