In this review, we will be comparing specifications of R-51M and Uni-Fi UB5, two Bookshelf speakers from Klipsch and ELAC.
Let's have a brief look at the main features of Klipsch R-51M and ELAC Uni-Fi UB5 before getting into our more detailed comparison.
Let's read on the following sections in order to better understand in detail how Klipsch R-51M and ELAC Uni-Fi UB5 compares and hopefully end up with enough arguments to decide which one is better for you.
One of the fundamental differences between these two speakers is that R-51M is a 2-way design whereas Uni-Fi UB5 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. R-51M features a 1" Tractrix Horn Tweeter , a " Midrange and 1 x 5.25" Copper-spun IMG Woofer with a Crossover frequency at 1660 Hz. On the other hand, Uni-Fi UB5 features a 1" Soft-dome Tweeter , a 4" Midrange and 1 x 5.25" Aluminum Woofer with a Crossover frequency at 270 / 2700 Hz.
R-51M has a frequency range of 62-21k Hz whereas Uni-Fi UB5 has a frequency range of 46-25k Hz.
Impedance and Sensitivity
R-51M is a 8 ohms speaker compared to Uni-Fi UB5 which has a nominal impedance of 4 ohms. These two speakers also have different sensitivity levels. R-51M sensitivity is rated at 93 dB and Uni-Fi UB5's is at 85 dB. This 8 dB difference makes Klipsch R-51M a more sensitive speaker compared to ELAC Uni-Fi UB5, hence will play louder with the same amount of watts.
R-51M has a power range of 85 watts RMS whereas Uni-Fi UB5 has a power range of 40-140 watts.
Input Type and Bi-Amping / Bi-Wiring
R-51M features Post type posts and Uni-Fi UB5 has a Post type posts. None of these speakers feature b-amping/bi-wiring.
Cabinet Type and Port Position
Both R-51M and Uni-Fi UB5 have a back firing ports.
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 Klipsch R-51M's and ELAC Uni-Fi UB5's external dimensions. Klipsch R-51M has external dimensions of 338.0mm x 178.0mm x 215.0mm ( 13.3inch x 7.0inch x 8.4inch ) whereas ELAC Uni-Fi UB5 has external dimensions of 324.0mm x 200.0mm x 273.0mm ( 12.7inch x 7.8inch x 10.7inch ) .
Klipsch R-51M is 22mm narrower and 58mm less deeper than ELAC Uni-Fi UB5 but it is also 14mm taller.
Below you can see the front view size comparison of Klipsch R-51M and ELAC Uni-Fi UB5.