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Empirical Lab Data · n = 261 Capsules

Why an uncalibrated ECM8000 is pure guesswork: 261 capsules compared in our lab.

We have individually calibrated 261 Behringer ECM8000 measurement microphones inside our symmetric Spectra SQ-4.2 pressure chamber against our Class-1 G.R.A.S. 40AE reference using the Audio Precision APx555. The charts below reveal the exact frequency response corridor, the 2D correlation of sensitivity vs. bass linearity, and IEC 61672-1 pass rates across frequency limits.

Measured Units
261
🟢 0 in stock now
★ Grade A / B / C / D
16 / 160 / 84 / 1
6% Golden Samples
1 kHz Sensitivity
11,67
mV/Pa Ø (6.0 – 17.6)
IEC Class 1 @ 10 kHz
6%
16 of 261 Kapseln
🔍 Interactive Serial Number Inspector

Project your microphone live into all laboratory charts

Click a preset serial number (or type yours): Its curve and position immediately light up in gold across the envelope plot, 2D scatter plot, and histograms!

Test presets:
Chart 01 · Frequency Response Corridor (n = 261)

Proof of Batch Variance: Median Curve, P10–P90 Core Band & Extremes

Across all 100 frequency points, the shaded blue corridor shows where 80% of all capsules (10th to 90th percentile) fall, while the dashed outer boundary marks the batch extremes.

-4 dB -2 dB 0 dB +2 dB +4 dB +6 dB +8 dB 31.5 50 100 200 500 1k 2k 5k 10k 12k 16k 20k Median Curve + P10–P90 Band (80%) Min/Max Batch Extremes Your Selected Serial Number
Chart 02 · 2D Cluster Analysis

Sensitivity (mV/Pa) vs. Bass Linearity (Bass Δ)

Each dot represents one measured microphone (Gold = Grade A, Blue = Grade B, Green = Grade C). Click any dot to inspect that unit!

Subwoofer-Referenz (Bass Δ ≤ 1.0 dB) 0.0 dB 0.5 dB 1.0 dB 1.5 dB 2.0 dB 5 mV 6 mV 7 mV 8 mV 9 mV 10 mV 11 mV 12 mV 13 mV 14 mV 15 mV 16 mV 17 mV 18 mV X: 1 kHz Sensitivity (mV/Pa) | Y: Bass Span Δ (dB)
Grade A Grade B Grade C Grade D
Chart 03 · IEC 61672-1 Compliance by Bandwidth

IEC Class 1 vs. Class 2 Pass Rate by Frequency Limit

Shows how many capsules natively stay within the strict IEC tolerance masks as the upper frequency limit is expanded from 10 kHz to 20 kHz.

20 Hz – 10 kHz
Class 1: 16 (6%) Class 2: 213 (82%)
82%
20 Hz – 12 kHz
Class 1: 13 (5%) Class 2: 171 (66%)
66%
20 Hz – 16 kHz
Class 1: 7 (3%) Class 2: 160 (61%)
61%
20 Hz – 20 kHz
Class 1: 5 (2%) Class 2: 143 (55%)
55%
💡 Lab Insight: Up to 10 kHz, the majority of our capsules natively meet strict IEC Class 1 tolerances. Above 12 kHz, the natural resonance of the 1/4" diaphragm shifts the response into Class 2 territory.
Grafik 04 · Histogramm

1 kHz Sensitivity Distribution (mV/Pa)

≤ 9,5 mV/Pa 22 mics (8%)
9,5 – 10,5 mV/Pa 44 mics (17%)
10,5 – 11,5 mV/Pa 65 mics (25%)
11,5 – 12,5 mV/Pa 57 mics (22%)
12,5 – 13,5 mV/Pa 33 mics (13%)
≥ 13,5 mV/Pa 40 mics (15%)
Grafik 05 · Histogramm

Low-Frequency Span 31.25 – 250 Hz (Bass Δ)

≤ 0,60 dB (Ultra-Flat) 135 mics (52%)
0,60 – 0,85 dB (Top Subwoofer) 86 mics (33%)
0,85 – 1,10 dB (Sehr gut) 27 mics (10%)
1,10 – 1,50 dB (Standard) 9 mics (3%)
≥ 1,50 dB (Erhöhte Drift) 4 mics (2%)
Documentation & ISO 9001 Traceability

Standard Included Report (€0) vs. Signed Factory Calibration Certificate (+€50)

The physical measurement on our Audio Precision APx555 is 100% identical for every microphone leaving our lab—there is no two-tier measurement accuracy! With the €50.00 upgrade, you receive the formal, personally signed test and quality management document for your records (e.g., ISO 9001 audits, test equipment monitoring, or client verification).

Aspect Standard Delivery (€0 Surcharge) Signed Factory Calibration Certificate (+€50 Upgrade)
Acoustic Measurement Simultaneous 2-channel measurement (APx555 + Spectra SQ-4.2 + G.R.A.S. 40AE) Exact same measurement—no two-tier metrology!
Digital Calibration Data .cal / .txt file + digital APx555 measurement report (PDF) .cal / .txt file + digital APx555 report + printed original
Signed Declaration of Conformity ❌ No ✅ Yes, personally signed by Dr.-Ing. Frank Jordan confirming compliance with DIN EN / IEC 61672-1 tolerance limits
Documented Traceability Proof ❌ No ✅ Yes, complete documentation of the PTB/DAkkS-traceable reference chain (G.R.A.S. 40AE, B&K 4231, APx555) for ISO 9001 audits
Legal Status (Lab vs. Accredited Body) Factory measurement ISO-compliant factory calibration certificate (not an ISO/IEC 17025 accredited calibration body, yet metrologically superior to many standard test benches thanks to our €50,000+ APx555 setup)

Ready to pick your exact serial number?

Filter all in-stock capsules by 10/12/16/20 kHz limit, Grade A–D, and IEC Class 1/2.

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