Why is individual calibration required for the Behringer ECM8000?

Mass-produced electret measurement microphones show significant unit-to-unit variance: the high-frequency peak can range from +2 dB to +7 dB, and sensitivity varies between 8.5 and 13.5 mV/Pa. Our simultaneous 2-channel pressure-chamber measurement on an Audio Precision APx555 against a G.R.A.S. 40AE Class 1 reference provides the exact calibration curve (.cal / .txt) for your serial number.

What is included in the base price (99.00 EUR to 169.00 EUR depending on grade)?

The base price includes a brand-new Behringer ECM8000 measurement microphone in its carrying case, the individual calibration file (.txt / .cal for REW, Akulap, ARTA, Smaart) for 0°, and the serial-specific APx555 PDF test report.

What is the difference between Selection Grades A, B, C, and D?

Every capsule is graded by its native frequency response flatness against IEC 61672-1 Class 1 and Class 2 tolerance masks. Grade A ('Golden Sample') represents the rarest capsules with minimal low-frequency ripple and flat high-frequency response that natively meet strict Class 1 limits up to 10 kHz even without software compensation.

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Audio Precision APx555 Precision Selection

Behringer ECM8000 – Individually Calibrated Measurement Microphones (IEC 61672-1)

Select your exact Behringer ECM8000 by serial number based on its real Audio Precision APx555 & Spectra SQ-4.2 pressure-chamber curve—including its individual .cal calibration file for REW, Akulap, and WinAudioMLS.

Web Audio API · Real-Time Auralization

🎧 Listening Test: How does this capsule actually sound?

Active Filter Profile: #---

Open Listening Test ▼

Experience the acoustic difference between the uncorrected frequency response of your chosen capsule and the flattened Dr. Jordan calibration – synthesized live in your browser.

🔴 Mode: Raw Capsule active. The exact frequency curve of the selected serial number is applied as an 11-band EQ filter. Listen closely to the high-frequency peak!

No audio file loaded (play the Synthetic Beat or pick a local MP3/WAV)

100% Client-Side: Audio processing stays strictly inside your browser (zero uploads).

11-Band Filterbank (31.25 Hz – 16 kHz · power-averaged, bandwidth-matched Q): Active: Capsule Curve

Lab Batch Statistics (APx555 & Spectra SQ-4.2)

Batch Variance Across 261 Measured Capsules

Our lab data proves: Mass-market electret capsules vary significantly at high frequencies and by over 4.5 dB in 1 kHz sensitivity. Our simultaneous 2-channel calibration gives you exact correction data instead of guesswork.

📊 Explore Interactive Batch Statistics & Find Your SN ➔

Quality Grading

★ Grade A (Golden Sample) 16 (6%)

Grade B (Select Curve) 160

Grade C (IEC Class 2) 84

1 kHz Sensitivity (mV/Pa)

Minimum: 5.98 mV/Pa

Average: 11.67 mV/Pa

Maximum: 17.57 mV/Pa

Batch sensitivity spread: > 4.5 dB (vs. G.R.A.S. 40AE)

12 kHz Repeatability Limit (Measured to 20 kHz)

We measure up to 20 kHz. Up to 12 kHz, the homogeneous pressure field inside the Spectra SQ-4.2 yields highly reproducible results. Above 12 kHz, short wavelengths and slight head-geometry asymmetries limit chamber symmetry—which is why we transparently mark the >12 kHz range.

Pressure chamber physics in Lab Dossier →

Lab Reference Chain (IEC 61094-5)

How we calibrate each individual ECM8000 simultaneously

No guesswork, no sequential swapping: Every capsule is calibrated simultaneously inside our symmetric Spectra SQ-4.2 pressure chamber against a traceable €50,000+ Class-1 reference chain. Click components for technical details.

📋 Full Lab Dossier & Comparison →

01. Dual Analyzer

Audio Precision APx555

-150 dB THD+N | 2-Ch Sync

02. Pressure Chamber

Spectra SQ-4.2

Symmetric | IEC 61094-5

03. Reference (Ch A)

G.R.A.S. 40AE 1/2"

Class 1 | 54.94 mV/Pa

04. Calibrator

Brüel & Kjær 4231