Earthworks
Earthworks QTC1
Small-diaphragm omni, measurement-style tapered body, phantom powered; 4 Hz to 40 kHz ±1 dB
Power Phantom 48 V.
- Type
- Condenser
- Pattern
- Omni
- Sensitivity
- −30.5 dBV/Pa
- Among 204 condensers: more output than 91%
- Among 311 mics: more output than 94%
- Self-noise
- 22 dB(A)
- Among 258 condensers: quieter than 16%
- Among 272 mics: quieter than 15%
- Max SPL
- 142 dB SPL
- Among 277 condensers: takes louder sound than 73%
- Among 343 mics: takes louder sound than 71%
- Rated range
- 4 – 40k Hz
vs 75 end-address condensers
More output than 88% of 75 end-address condensers.
Each stripe is one end-address condenser with a published sensitivity, and each bar counts them; further right means more output. This mic is in blue.
vs 104 end-address condensers
Quieter than 10% of 104 end-address condensers.
Each stripe is one end-address condenser with a published self-noise, and each bar counts them; further right means quieter. This mic is in blue.
vs 110 end-address condensers
Takes louder sound than 77% of 110 end-address condensers.
Each stripe is one end-address condenser with a published max SPL, and each bar counts them; further right means it takes louder sound. This mic is in blue.
Instruments sources recommend it for most
Proximity effect: the bass it gains up close
From the spec sheet, p. 1.
"QTC1 Frequency Response", on axis; relative dB, 0 dB as printed. Distance, room and smoothing not stated. The line is the "Typical response"; the grey band is the "Normal production range".
Dashed: outside the rated range, or simulated (other angles and distances). Hover or tap the graphs for values.
In practice
All specs
| From the spec sheet | ||
|---|---|---|
| Sensitivity | −30.5 dBV/Pa (30 mV/Pa)"30 mV/Pa (-30.5 dBV/Pa)". | p. 1 |
| Self-noise | 22 dB(A)"22dB SPL equivalent (A weighted)". | |
| Max SPL | 142 dB SPL5 kohm load. "142 db SPL with 5K ohm load". | |
| Rated load impedance | 600 ohmminimum, at pin 2 and pin 3. "Min output load: 600 ohms at pin 2 and pin 3". | |
| Rated frequency range | 4 Hz to 40 kHz±1 dB, on axis. "Frequency response on axis: ±1dB 4Hz to 40kHz". | |
| Powering | phantom 48 V"48V Phantom, 10mA". | |
| Current draw | 10 mA | |
| Connector | XLR, balanced (pin 2 +)"XLR intended to drive a balanced input (Pin 2+)". | |
| Weight | 225 g"225g (.5 lb)". | |
| Dimensions | 229 × 22 mm"Dimensions (L x D): 229mm x 22mm (9 x .860 inches)": length, diameter. | |
| Peak output voltage | 3 V into 1 kohm, 10 V into 5 kohm | |
| Flatness | Typically within ±0.5 dB from 20 Hz to 20 kHz | |
| Name | QTC: "quiet time coherent" | |
| ApplicationsEarthworks | Ambient miking, and close miking of quiet or delicate sources: percussion, piano, guitar, upright bass, strings, vocals, brass, woodwinds; location recording; Foley, ADR, sound effects, sampling | |
Documents
- Earthworks QTC1 quiet time coherent omnispec sheet, 1998
Copies kept by Mic Archive (manufacturers move and drop their documents), unchanged, with their original addresses. Each is © its publisher.
Recommended for
By recording guides, engineers and mic makers, for this mic or an earlier version of it.