In this review, we will be comparing specifications of S20 and Motion 15i, two Bookshelf cameras from Polk Audio and MartinLogan.
Let's have a brief look at the main features of Polk S20 and MartinLogan 15i before getting into our more detailed comparison.
Let's read on the following sections in order to better understand in detail how Polk S20 and MartinLogan 15i compares and hopefully end up with enough arguments to decide which one is better for you.
Both S20 and Motion 15i are 2-way speakers. S20 features a 1" Terylene high-res dome Tweeter and 1 6.5" Mica-reinforced polypropylene Woofer . On the other hand, Motion 15i features a 1.0 x 1.4" Folded Motion Tweeter and 1 5.25" Aluminum Woofer with a Crossover frequency at 2700 Hz.
S20 has a frequency range of 39-40k Hz whereas Motion 15i has a frequency range of 60-25k Hz.
Impedance and Sensitivity
S20 is a 8 ohms speaker compared to Motion 15i which has a nominal impedance of 5 ohms. These two speakers also have different sensitivity levels. S20 sensitivity is rated at 88 dB and Motion 15i's is at 92 dB dB.
S20 has a power range of 20-125 watts RMS whereas Motion 15i has a power range of 20-200 watts.
Input Type and Bi-Amping / Bi-Wiring
S20 features Custom 5-way tool-less binding posts type posts and Motion 15i has a Custom 5-way tool-less binding posts type posts. None of these speakers feature b-amping/bi-wiring.
Cabinet Type and Port Position
Both S20 and Motion 15i features dual binding post speaker terminals for bi-amping or bi-wiring.