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.

Celestion Seventy 80

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 (G12P-80) frequency response

Celestion Seventy 80 frequency response from 0,5m (0 deg and 45 deg)

Celestion Seventy 80 (G12P-80) free-air impedance plot

Celestion Seventy 80 free-air impedance

Celestion Seventy 80 (G12P-80) harmonic distortion (2,8V RMS)
Harmonic distortion at 2,8V RMS

Celestion Seventy 80 Shure SM57

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)

Celestion Seventy 80

My measurement vs. datasheet (red: mine, blue: Celestion datasheet)

Celestion V30 vs Seventy 80

Celestion Seventy 80 vs. Celestion V30

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