Audioengine A2+ vs. Klipsch Reference R-51M

Audioengine A2+ Wireless Bluetooth Speakers Klipsch Reference R-51M Bookshelf Speakers
$270 $350
Dimensions (H × W × D)
6.00” × 4.00” × 5.25”
152mm × 102mm × 133mm
13.00” × 7.00” × 8.56”
330mm × 178mm × 217mm
Power Type
Powered Passive
Frequency Response
65-22,000 Hz 62-21,000 Hz

Key Takeaways

TLDR Summary: In the realm of compact speakers, Audioengine A2+ Wireless offers a modern touch with Bluetooth functionality, targeting the minimalist audiophiles who crave convenience without sacrificing sound. The A2+'s deliver a warm, detailed sound with the bonus of easy desktop integration. On the other side, Klipsch Reference R-51M bookshelf speakers boast a robust, lively sound signature, courtesy of their proprietary horn-loaded technology. They require an external amplifier but reward listeners with a more dynamic range and spatial presence. Preference hinges on usage: wireless ease and space-saving versus a traditional, powerful audio experience for the dedicated enthusiast.

Speaker Comparison

When considering upgrades for a home audio setup, the shelves of audiophiles and casual listeners alike are often graced with compact speakers that pack a punch. In the realm of these sonic giants in miniature forms, two contenders stand out: the Audioengine A2+ Wireless Bluetooth Speakers and the Klipsch Reference R-51M Bookshelf Speakers. For enthusiasts looking to refine their auditory experience, diving into the details of these two models is not just a quest—it's a necessity.

The Audioengine A2+ is a successor to the critically acclaimed A2 series, and they come with a modern twist—wireless Bluetooth connectivity. This feature alone propels the A2+ into the limelight for those who prioritize the convenience of streaming audio from a variety of devices. On the other hand, the Klipsch R-51M speakers, part of the iconic Reference line, stand firm in the tradition of high-fidelity audio. While they lack Bluetooth functionality, they compensate with their exceptional wired sound quality.

Audioengine A2+ Wireless Bluetooth Speakers
Audioengine A2+ arrow (at

Design and Build Quality

In terms of design, the Audioengine A2+ speakers are sleek and compact, reflecting a minimalist aesthetic that fits seamlessly into modern home decors. Their build quality is solid, with a dense wooden cabinet that helps to reduce unwanted resonances. The Klipsch R-51M speakers, with their larger footprint, sport the signature copper spun woofers and a tractrix horn tweeter that not only serve an audible purpose but also add a distinctive visual appeal to the setup. The R-51M’s MDF construction and textured wood grain vinyl finish echo a more traditional look that's hearty and robust.

Sound Performance

When it comes to sound, the Audioengine A2+ boasts a well-balanced profile with unexpectedly deep lows coming from such a small package. Their custom aramid fiber woofers and silk dome tweeters deliver a sound that is crisp and clear, with a tight bass that belies their size. The built-in digital-to-analog converter (DAC) ensures that the sound remains pure and unadulterated, whether connected via Bluetooth or a wired connection.

Klipsch Reference R-51M Bookshelf Speakers
Klipsch Reference R-51M arrow (at

The Klipsch R-51M, however, is a force to be reckoned with in terms of power and clarity. The hallmark of Klipsch sound is the remarkable efficiency and the dynamic range that these speakers provide. The R-51M's larger drivers and proprietary horn-loaded tweeter produce a more room-filling sound with a dynamic punch that can handle the subtleties of jazz ensembles and the ferocity of rock concerts with equal finesse.

Connectivity and Versatility

Connectivity is where the Audioengine A2+ really shines. The inclusion of Bluetooth adds a layer of convenience and versatility that is hard to overlook. Pairing devices is straightforward, and the wireless connection is stable and reliable. Additionally, the A2+ speakers include RCA and 3.5mm inputs, as well as a USB input for a direct digital connection, accommodating a range of audio sources.

Conversely, Klipsch's R-51M takes a more purist approach, focusing on traditional wired connections. With a single set of binding posts, these speakers are designed to be driven by a quality amplifier or receiver, ensuring the best possible sound from your source material. While this may appeal to audiophiles who demand a pure signal path, it could be seen as a limitation for those who prefer the flexibility of streaming audio.

In conclusion, choosing between the Audioengine A2+ Wireless Bluetooth Speakers and the Klipsch Reference R-51M Bookshelf Speakers boils down to personal preference and intended use. The A2+ offers modern features like Bluetooth connectivity and a space-saving design, ideal for a desktop or small room. The R-51M, on the other hand, favors the traditionalist with its larger drivers, enhanced power handling, and wired connection, catering to those who have a dedicated listening space. Whichever path one chooses, both speakers stand as testaments to their makers' dedication to quality sound reproduction in compact forms.

Check Current Prices:

Audioengine A2+ Wireless Bluetooth Speakers
Audioengine A2+ Wireless Bluetooth Speakers
Klipsch Reference R-51M Bookshelf Speakers
Klipsch Reference R-51M Bookshelf Speakers

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Disclaimer: the speaker data listed on this website are correct to the best of our knowledge, but we do not guarantee the accuracy of the data. Please double-check any measurements with the manufacturer before making a final purchasing decision.