Cayin RU9 vs iFi Go Bar vs Chord Mojo 2: Which One Should You Buy?

Cayin RU9 – Best for Warm, Musical Sound

The Cayin RU9 stands out because of its hybrid approach. Unlike most portable DAC/amps, it allows users to switch between transistor and Nutube amplification modes. This creates a unique listening experience that can shift from analytical to warm and musical instantly. 

Audiophiles who enjoy jazz, vocals, acoustic music, and relaxed listening sessions often prefer the RU9 because of its richer tonal presentation. The tube mode especially adds smoothness and depth that many listeners describe as more “analog-like.”

The RU9 also offers strong output power, balanced connectivity, and support for high-resolution formats including DSD512. Compared to dongle-style DACs, it feels closer to a true portable desktop system.

However, there are trade-offs:

• Larger and heavier than the iFi GO Bar
• Battery life is weaker than Mojo 2
• Less pocket-friendly for daily commuting

For users wanting emotional, musical sound rather than purely clinical detail, the RU9 is arguably the most enjoyable option.

iFi GO Bar – Best for Ultra-Portability

The iFi GO Bar focuses on portability without sacrificing audio quality. It is significantly smaller and lighter than both the RU9 and Mojo 2, making it ideal for travelers and smartphone users. 

Despite its compact size, the GO Bar includes:

• Balanced 4.4mm output
• XBass and XSpace enhancements
• iEMatch support for sensitive IEMs
• Strong power output for portable headphones

Its sound signature leans slightly energetic and detailed, making it excellent for modern music genres like EDM, pop, and rock. The GO Bar also pairs extremely well with in-ear monitors because of its low noise floor.

One major advantage is convenience. Unlike the Mojo 2 or RU9, the GO Bar works almost like a plug-and-play dongle DAC. It slips easily into a pocket and requires minimal setup.

Still, it does have limitations:

• Less powerful than the RU9 for demanding headphones
• Smaller soundstage than Mojo 2
• Lacks the advanced DSP controls found on the Chord Mojo 2

For listeners prioritizing portability and simplicity, the GO Bar is the easiest recommendation.

Chord Mojo 2 – Best Overall Technical Performer

The Chord Mojo 2 remains one of the most respected portable DAC/amps in the audiophile community. Instead of using conventional DAC chips, Chord uses its proprietary FPGA-based architecture and advanced DSP processing.

This gives the Mojo 2 a reputation for:

• Exceptional detail retrieval
• Outstanding imaging and separation
• Highly accurate sound reproduction
• Advanced EQ and DSP controls

Compared to the RU9, the Mojo 2 sounds cleaner, more transparent, and more analytical. Many listeners consider it the best option for critical listening and high-resolution audio playback.

Its battery life is also stronger than the RU9, making it better suited for extended travel sessions. 

However, Mojo 2 is not perfect:

• No balanced output
• The interface can feel confusing initially
• Slightly bulky compared to dongle DACs

Still, when it comes to raw technical performance, the Mojo 2 often leads the category.

Product Comparison Table

Which One Should You Buy?

Choose the Cayin RU9 if:

• You love warm, emotional, tube-like sound
• You want flexibility between tube and solid-state modes
• You mainly use premium over-ear headphones

Choose the iFi GO Bar if:

• You want maximum portability
• You mainly use IEMs
• You need a simple, everyday portable DAC

Choose the Chord Mojo 2 if:

• You prioritize technical performance and detail
• You enjoy tweaking EQ and DSP settings
• You want the most refined analytical sound

For most audiophiles, the Mojo 2 remains the safest “best overall” choice because of its technical ability and versatility. But listeners who value musicality may actually enjoy the RU9 more, while travelers and commuters will likely prefer the GO Bar’s compact design.

Portable audio is highly subjective, and headphone synergy matters enormously. The best DAC/amp is ultimately the one that matches both your listening style and your headphones.