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7Hz Timeless II specifications and in-depth review

7Hz Timeless II

Manufacturer: 7Hz

The 7Hz Timeless II is an in-ear monitor built around a planar magnetic driver design, housed in a CNC-machined metal shell that reflects a focus on structural precision. It ships with a travel bag and uses a detachable cable terminated with a 2-pin (0.78 mm) connector, giving users straightforward options for cable replacement or swapping.

On the technical side, the Timeless II operates with a single planar magnetic driver and an impedance of 15.2 ohms, making it relatively easy to drive. Total harmonic distortion is rated at ≤0.2% at 1 kHz, and the stated frequency range spans 20 Hz to 20,000 Hz. The included cable measures 1.2 meters in length and terminates in a 3.5 mm connector, while the IEM itself lacks both an in-line control panel and a built-in microphone.

Pros
  • The detachable cable with a 2-pin (0.78 mm) connector makes it easy to replace or swap cables without discarding the entire unit
  • A planar magnetic driver in an IEM form factor offers a less common driver technology within the category
  • The CNC-machined metal shell provides a sturdy, precisely constructed housing
  • Total harmonic distortion rated at ≤0.2% at 1 kHz reflects a low level of signal coloration
  • A travel bag is included, offering a ready-to-use storage solution out of the box
  • At 15.2 ohms impedance, the IEM does not demand a powerful source to drive it
Cons
  • No built-in microphone means it cannot be used for calls or voice input without a separate device
  • The absence of an in-line control panel removes the ability to adjust volume or manage playback directly from the cable
  • A single driver handles the full frequency range with no dedicated drivers for different frequency bands
  • The cable terminates in a 3.5 mm connector only, which limits direct compatibility with devices that lack a headphone jack
Who is this for?

This IEM is well-suited for dedicated listening sessions where audio quality and low distortion matter, given its planar magnetic driver and THD rating of ≤0.2% at 1 kHz. The low 15.2-ohm impedance makes it a practical choice for users who want to drive it from a portable DAC or smartphone dongle without needing high-powered amplification. The detachable cable and included travel bag also make it a reasonable fit for users who want a packable, maintainable IEM for on-the-go use.

Who is this NOT for?

Users who need hands-free calling or voice communication will find this IEM lacking, as it includes no built-in microphone. Those who rely on in-line playback controls for managing music or calls directly from the cable will also find the experience inconvenient, since no such panel is present. Additionally, users who primarily connect to devices without a 3.5 mm headphone jack may face compatibility issues, as the cable only terminates in a standard 3.5 mm plug.

General info:

Driver configuration 1PD
Type of drivers Planar magnetic
Shell material/process CNC-machined metal
has a built-in microphone ✕
travel bag is included ✓
Has an in-line control panel ✕

The 7Hz Timeless II uses a single planar magnetic driver configuration, housed in a shell crafted from CNC-machined metal for a solid, precisely built construction. A travel bag is included in the package, adding a degree of convenience for storage and portability. The IEM does not feature a built-in microphone or an in-line control panel.

Specifications:

drivers count 1
impedance 15.2 Ohms
Total harmonic distortion (THD) ≤0.2% (@1kHz)
lowest frequency 20 Hz
highest frequency 20000 Hz

The 7Hz Timeless II is built around a single driver and carries an impedance of 15.2 ohms, placing it on the easier end of the drive requirements spectrum. Its total harmonic distortion is rated at ≤0.2% at 1 kHz, indicating a low level of signal coloration. The stated frequency range runs from 20 Hz at the low end up to 20,000 Hz at the top.

Cable:

Connector type 3.5 mm
Pin connector 2-Pin (0.78 mm)
cable length 1.2 m
has a detachable cable ✓

The included cable is detachable and connects to the IEM via a 2-pin (0.78 mm) connector, allowing for straightforward cable replacement when needed. It measures 1.2 meters in length and terminates in a standard 3.5 mm plug at the other end.

Final Verdict

The 7Hz Timeless II is a focused IEM that centers its identity around a planar magnetic driver with low harmonic distortion, housed in a durably constructed CNC-machined metal shell. Its low impedance keeps it accessible without dedicated high-powered equipment, and practical touches like the detachable cable and included travel bag add to its day-to-day usability. The absence of a microphone and in-line controls does narrow its appeal to those seeking a pure listening-focused experience rather than an all-purpose solution. For users whose primary goal is attentive, distortion-conscious listening with the flexibility of cable swapping, the Timeless II presents a coherent and well-specified option within the in-ear monitor category.