Headphone amplifiers, commonly referred to as "amps," are essential components in high-fidelity audio systems. When placed between the audio source and the headphones, they significantly enhance sound quality and allow for tone adjustments. This has become a widely accepted practice among headphone enthusiasts, especially when using high-end headphones priced over 1,000 yuan. The difference in sound quality after adding an amplifier is often clearly noticeable.
Although many audio sources like CD players come with headphone jacks, the internal circuitry and components behind these jacks are usually of average quality. For example, most CD players use inexpensive operational amplifiers such as the 4556 or 4558, which cost just a few dollars. It's hard to imagine that such components can deliver high-quality sound. Even more advanced CD players rarely feature headphone amplification circuits that meet true audiophile standards.
Some high-end CD players costing over 10,000 yuan still only use two JRC4558 chips for their headphone output. While this may be sufficient for standard dynamic drivers, it falls short when compared to the full potential of high-end headphones. Some mid-to-high-end audio devices, such as the Marantz CD17 and above, even omit the headphone jack entirely, requiring users to pair them with a dedicated headphone amplifier to achieve optimal performance.
A headphone amplifier is specifically designed to drive high-impedance headphones. Most standard headphones have an impedance range of 16–32 ohms, but high-end HIFI headphones often feature higher impedance due to their long-stroke, high-density coil designs. These can reach up to 200–600 ohms. Standard portable players or power amplifiers are typically designed for low-impedance outputs, and when connected to high-impedance headphones, they can cause distortion and poor frequency response. Headphone amplifiers, on the other hand, are built to handle these demands and provide improved sound quality with enhanced clarity and dynamics.
Here are some top headphone amplifier recommendations:
1. **SPL Phonitor 2730**
- Compatible with: Sennheiser HD800
- Price: Around 18,000 yuan
This premium headphone amplifier from SPL, a German manufacturer known for professional recording equipment, offers balanced input and multiple adjustment options for different headphone types. It features a fully balanced interface, making it ideal for audiophiles who demand precision and clarity.
2. **Beyerdynamic A1**
- Compatible with: Beyerdynamic DT880, DT990, T1
- Price: Around 9,900 yuan
The Beyerdynamic A1 is a well-rounded amplifier that delivers excellent sound quality. Though not luxurious in appearance, it outperforms many big-name brands in terms of soundstage and detail. It’s particularly effective when used with high-end models like the T1.
3. **O1 (Overseas Version)**
- Compatible with: AKG K701, DT990
- Price: Around 4,500 yuan
This budget-friendly option includes a built-in DAC and supports optical and coaxial inputs. It's a great choice for those looking for a simple, cost-effective solution. Its amplifier section performs exceptionally well, especially for classical music and orchestral tracks.
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