A common value for high impedance is 250 Ω, although it can also be 600 Ω or even higher, depending on the specific application and desired performance. High impedance generally refers to an electrical resistance to alternating current that is significantly greater than what is considered low impedance.
Understanding High Impedance in Ohms
Impedance, measured in ohms (Ω), is a crucial specification in audio equipment, particularly for headphones and amplifiers. It represents the total opposition a circuit presents to the flow of alternating current. This includes both resistance and reactance. The choice between high and low impedance gear can significantly impact sound quality, volume, and the compatibility between devices.
Common High Impedance Values
While there isn't a single universal "high impedance" number, specific values are widely recognized within the audio industry:
- 250 Ω: This is a frequently encountered impedance for many studio-grade and audiophile headphones. It strikes a balance, often delivering excellent sound quality when paired with a suitable amplifier.
- 600 Ω: For those seeking the absolute most from their audio system, especially when paired with powerful, dedicated amplifiers, an impedance of 600 Ω is often recommended. High-impedance models like the Beyerdynamic DT 990 Edition are prime examples designed to excel at this level, provided your system can supply the necessary power.
These values contrast sharply with low impedance devices, which typically range from 16 Ω to 80 Ω, making them suitable for portable devices with less power output.
Low vs. High Impedance: A Quick Comparison
Understanding the differences between impedance types helps in selecting the right audio equipment for your needs.
| Impedance Type | Common Ω Values | Typical Applications & Characteristics |
|---|---|---|
| Low Impedance | 18 Ω, 32 Ω, 80 Ω | Designed for portable devices (smartphones, laptops) and consumer-grade audio. Easier to drive, but may be more susceptible to distortion with powerful sources. |
| High Impedance | 250 Ω, 600 Ω | Ideal for studio use, audiophile setups, and professional audio equipment. Requires more power from a dedicated amplifier, offering cleaner sound and better current control. |
Why Choose High Impedance?
Opting for high-impedance audio equipment, particularly headphones, offers several advantages:
- Superior Sound Quality: When paired with an appropriate headphone amplifier, high-impedance headphones can deliver a cleaner, more detailed sound with reduced distortion.
- Better Power Handling: They are less susceptible to damage from powerful amplifiers, as the higher impedance limits the current flowing through the voice coils.
- Reduced Noise Floor: High impedance can sometimes help in reducing audible hiss or background noise, especially with sensitive audio sources.
- Optimal System Performance: As highlighted, to "get the most out of your system," particularly if it can supply substantial power, choosing a model with 600 Ω impedance can unlock its full potential.
Practical Considerations
When considering high-impedance audio gear, keep these points in mind:
- Amplification is Key: High-impedance headphones require a dedicated, powerful headphone amplifier to achieve adequate volume and optimal sound performance. Connecting them directly to a smartphone or computer's headphone jack will likely result in very low volume and poor sound quality.
- System Matching: Ensure your audio source and amplifier are well-matched to the impedance of your headphones. A mismatch can lead to underperformance or even damage.
- Durability and Longevity: Due to lower current flow at a given voltage, high-impedance headphones can sometimes be more durable and less prone to burnout compared to their low-impedance counterparts when subjected to high power.
In essence, high impedance values like 250 Ω and 600 Ω are benchmarks for audio equipment designed to deliver premium performance, especially when integrated into a well-powered and carefully matched audio system.
