condenser-like reach and sensitivity without requiring any external power.

Crystal microphones operate completely passively, yet they often capture distant detail and subtle acoustic information With great sensitivity. The AIWA Crystal M25 embodies this principle in a beautifully minimal handheld design, combining elegant ergonomics with remarkably efficient engineering.

OPTICAL CONDITION

Excellent condition.

The housing is exceptionally well preserved, with very clean surfaces and no significant wear. All external elements, including the cable strain relief spring and hanging clip, remain intact and fully functional. The microphone presents beautifully, with its original shape and finish fully preserved.

TECHNICAL CONDITION

- Perfect technical condition.

- Fully functional crystal capsule

- nterior cleaned

- All original internal components intact and preserved

The microphone required no material replacement. The original rubber damping elements remain in excellent condition and continue to function exactly as intended.

BUILD & DESIGN

The Crystal M25 is designed as a true handheld microphone, with proportions and shaping that fit naturally and comfortably in the hand. Its smooth, symmetrical housing and rounded lines give it a refined and highly functional form.

A thoughtful feature is the integrated metal hanging clip at the top of the microphone. The cable entry is reinforced with a metal spring strain relief, protecting the cable from mechanical fatigue — a simple but highly effective design choice that contributes to long-term durability.

Capsule
The microphone uses a crystal transducer based on piezoelectric material. This technology allows the microphone to generate signal directly from diaphragm movement, without requiring any powering or active circuitry.

Unlike many dynamic microphones, this design does not rely on foam damping materials. Instead, rubber elements are used for mechanical isolation and stability. This choice has proven extremely durable over time, with the original internal materials remaining fully functional even decades after manufacture.

Crystal capsules with high sensitivity, fast transient response, and extended acoustic reach, often behaving more similarly to condenser microphones in their ability to capture distant or subtle sound sources.

Circuit
Passive piezoelectric crystal transducer. No external power required. High impedance output.

TECHNICAL SPECIFICATIONS

Type: Crystal handheld microphone
Polar Pattern: Likely omnidirectional
Frequency Response: Estimated 120 Hz – 10,000 Hz
Mounting: Handheld, integrated hanging clip
Output: High impedance, unbalanced

SOUND CHARACTERISTICS

The Crystal M25 delivers a highly sensitive but radiophonic sound, with a distinctive high bell and typical saturation. reach and detail. Its transient response is fast

Low-frequency response is naturally limited, resulting in a lean and articulate tonal balance rather than warmth. Midrange and high frequencies are highly present with lots of room detail.

Crystal microphones offer a uniquely direct and detailed sound character, functioning almost like a passive condenser microphone in behavior, but with their own distinct tonal signature.

Self-noise remains moderate - high and consistent with crystal microphone technology.

FREQUENCY RESPONSE

Estimated Frequency Response: 120 Hz – 10,000 Hz

• Limited low-frequency extension
• Highly sensitive midrange response
• Excellent transient clarity
• Strong presence and detail

Fully functional and exceptionally well preserved, this microphone offers a unique combination of passive operation, high sensitivity, and distinctive sonic character.

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