Celestion Seventy 80 guitar speaker measurements
Last edited: Feb. 26, 2019
This is a collection of my measurements about a Celestion Seventy 80 (or G12P-80) guitar speaker. For the close field measurements I've used a Laney TFX2 cabinet.
These speakers come stock in many guitar amps and compare to other generic guitar speakers they have a reasonable sound.
I've used a solid state amplifier (LM3875 clone) for the frequency response measurements. The amp has a linear frequency response and low output impedance so the typical tube amp response is missing from these graphs. Without tube amp response (looks like a 'compressed' impedance curve) guitar speakers have a very 'nasal' sound.
| Measured Thiele-Small parameters | |
|---|---|
| Rdc | 5.6 Ω |
| Fs | 94 Hz |
| Zmax | 101 Ω |
| Qms | 13.6 |
| Qes | 0.81 |
| Qts | 0.77 |
Celestion Seventy 80 frequency response from 0,5m (0 deg and 45 deg)
Celestion Seventy 80 free-air impedance
Harmonic distortion at 2,8V RMS
Close field response with Shure SM57 in a Laney TFX-2 cabinet, mic distance from the grill clothes is 1 cm (red: closed box, blue: open back)
Measurement vs. datasheet (red: mine, blue: Celestion datasheet)
Celestion Seventy 80 vs. Celestion V30
See also:
Guitar amp modeling: Roland Micro Cube (v1) Classic Stack model analysis & measurements
