Aperion Audio Intimus 5B vs. Klipsch Reference R-51M

Aperion Audio Intimus 5B Bookshelf Speakers Klipsch Reference R-51M Bookshelf Speakers
$450 $350
Dimensions (H × W × D)
12.00” × 6.75” × 8.00”
305mm × 171mm × 203mm
13.00” × 7.00” × 8.56”
330mm × 178mm × 217mm
Power Type
Passive Passive
Frequency Response
80-20,000 Hz 62-21,000 Hz

Key Takeaways

TLDR Summary: In the realm of bookshelf speakers, the Aperion Audio Intimus 5B and Klipsch Reference R-51M stand as formidable contenders. The 5B's deliver a warm, balanced soundstage with a meticulous focus on detail, owing much to their silk-dome tweeters and woven-fiberglass woofers. In contrast, the R-51M speakers feature Klipsch's signature horn-loaded tweeter and copper-spun IMG woofers, offering a dynamic, lively listening experience with an assertive punch. While the 5B's excel in refined precision, the R-51M's thrive on energetic presentations, making the choice between them a matter of personal taste in aural indulgence.

Speaker Comparison

When it comes to bookshelf speakers, audiophiles seek a blend of aesthetics, performance, and value. The Aperion Audio Intimus 5B and Klipsch Reference R-51M bookshelf speakers are two offerings that often capture the attention of discerning listeners. Both speakers promise high-quality sound reproduction in compact packages, but their approaches to achieving this are notably different. The Aperion Intimus 5B, with its refined looks, caters to a crowd that values understated elegance. On the other hand, the Klipsch R-51M, with its iconic copper-spun IMG woofers, is an eye-catcher, a speaker that makes a visual statement as strong as its acoustic presence.

Design and Build Quality

The Aperion Intimus 5B speakers exude class with their hand-rubbed wood veneer finishes, offering a touch of luxury to the decor. They come in various colors, allowing a seamless blend with furniture and room aesthetics. The build quality is impressive, with a solid cabinet that minimizes resonance, thus contributing to a purer sound. Klipsch R-51M speakers, meanwhile, present a more industrial design. They sport a textured wood grain vinyl wrap that's durable and easy to maintain. The tractrix horn-loaded aluminum tweeter is a distinct feature, both visually and performance-wise, giving the Klipschs a unique identity.

Aperion Audio Intimus 5B Bookshelf Speakers
Aperion Audio Intimus 5B arrow (at Amazon.com)

Sound Characteristics

For audiophiles, however, the true test of a speaker's worth lies in its sound. The Intimus 5B offers a balanced sound profile, with a silk-dome tweeter that delivers smooth highs and a kevlar woofer producing tight, accurate bass. They deliver a wide and deep soundstage, allowing listeners to pinpoint the location of each instrument. The R-51M, with its hallmark Klipsch sound, provides a more aggressive and lively audio experience. The horn-loaded tweeter ensures a dynamic and detailed high-end, while the copper-spun woofer brings forth punchy and expressive bass, albeit less controlled than the Intimus 5B's.

When it comes to power handling and sensitivity, the Klipsch R-51M has an edge. With a sensitivity rating of 93 dB at 2.83V/1m, it can play louder with less amplification compared to the Intimus 5B, which has a lower sensitivity of 87 dB at 2.83V/1m. This makes the Klipsch speakers a great pair for those who may not have high-powered amplifiers but still crave substantial volume levels. The Intimus 5Bs, while requiring more power, reward the listener with a more nuanced performance at moderate volume levels.

Klipsch Reference R-51M Bookshelf Speakers
Klipsch Reference R-51M arrow (at Amazon.com)

Room Integration

Both sets of speakers have rear-firing ports, which means placement can be a bit more critical; they often benefit from being a certain distance from the wall to optimize bass response. The Intimus 5Bs are fairly forgiving in terms of room placement, thanks to their more balanced sound signature. They're versatile enough to function in various room sizes without overwhelming the space. The Klipsch R-51M speakers, conversely, have a more directive sound due to the horn tweeter, and can sound more intense in smaller rooms. They're ideal for those who prefer a more direct and engaging listening experience and have the space to accommodate it.

In terms of connectivity, both speakers offer high-quality binding posts that accommodate banana plugs, spades, or bare wire, ensuring compatibility with a wide range of amplification systems. The Aperion Intimus 5Bs are bi-amp or bi-wire capable, offering an additional level of performance tuning for enthusiasts who like to customize their listening experience. The Klipsch speakers do not provide this feature, but their easy-driving nature makes them less dependent on such versatility.

Ultimately, the choice between Aperion Audio Intimus 5B and Klipsch Reference R-51M bookshelf speakers may come down to personal preference in sound and aesthetics. The Intimus 5Bs offer a more refined and balanced auditory experience, suited to those who enjoy detailed listening sessions across various genres. The Klipsch R-51Ms, on the other hand, cater to those seeking a bold and dynamic sound that can energize any soundtrack. Each offers a different approach to high-fidelity audio, and either could be the perfect match for the right listener's environment and taste.

Check Current Prices:

Aperion Audio Intimus 5B Bookshelf Speakers
Aperion Audio Intimus 5B Bookshelf 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.