I still laugh when people make such a big deal about TSP's with respect to guitar cabinets. But, the trend has been to convince people that every minuscule detail makes some massive difference.
When discussing people's fascinating with gear, a top Los Angeles music producer told me once, "Be careful what you listen for because you will eventually convince yourself that you heard it.!"
Regarding Thiele Small Parameters:
Electric guitar speakers do not reproduce ‘low’ frequencies. The low E string of a guitar has a fundamental frequency of 82Hz, and so the frequencies at which Thiele Small parameters have significance are mostly below the operating range.
Also, the parameters are measured at very small signal levels. Guitar speakers become non-linear at very low levels compared to other types of speakers, greatly reducing the significance of Thiele Small parameters in actual speaker use. Using the Thiele Small parameters of a typical guitar speaker, you will find that halving or doubling the cabinet size makes minimal difference to the response.
Thiele Small Parameters have absolutely NO relevance to open back cabinets.
Guitar speakers are not recommended for use in ported cabinets because the increase in cone excursion, below the tuning frequency, can cause the thin paper edge of the cone to tear.
The cabinet size, shape and construction are of far higher significance than the internal volume. Cabinet design, using Thiele Small Parameters, ignore these most fundamental aspects. Important factors include the material you make the cabinet from, the panel sizes and shapes, how they are joined, how the cabinet is finished, the mounting of the speaker, etc. These, not Thiele Small Parameters, are the critical factors in the design and ultimately the sound of a guitar speaker cabinet.
Cabinet shape and frequency response: These graphs demonstrate the effect a loudspeaker's cabinet shape has on its frequency response.
Source: Celestion
When discussing people's fascinating with gear, a top Los Angeles music producer told me once, "Be careful what you listen for because you will eventually convince yourself that you heard it.!"
Regarding Thiele Small Parameters:
Electric guitar speakers do not reproduce ‘low’ frequencies. The low E string of a guitar has a fundamental frequency of 82Hz, and so the frequencies at which Thiele Small parameters have significance are mostly below the operating range.
Also, the parameters are measured at very small signal levels. Guitar speakers become non-linear at very low levels compared to other types of speakers, greatly reducing the significance of Thiele Small parameters in actual speaker use. Using the Thiele Small parameters of a typical guitar speaker, you will find that halving or doubling the cabinet size makes minimal difference to the response.
Thiele Small Parameters have absolutely NO relevance to open back cabinets.
Guitar speakers are not recommended for use in ported cabinets because the increase in cone excursion, below the tuning frequency, can cause the thin paper edge of the cone to tear.
The cabinet size, shape and construction are of far higher significance than the internal volume. Cabinet design, using Thiele Small Parameters, ignore these most fundamental aspects. Important factors include the material you make the cabinet from, the panel sizes and shapes, how they are joined, how the cabinet is finished, the mounting of the speaker, etc. These, not Thiele Small Parameters, are the critical factors in the design and ultimately the sound of a guitar speaker cabinet.
Cabinet shape and frequency response: These graphs demonstrate the effect a loudspeaker's cabinet shape has on its frequency response.
Source: Celestion