Below is a frequency plot for a Fender Champion 600 using it's own speaker first, then with the internal speaker unhooked and the Champion amp connected directly to the speaker in 4 different combos.
Green is the stock speaker
Purple is the stock alnico in and Ampeg Jet Cab
Red is an Eminence Legend 12" in Fender Deluxe Cab
Yellow is a Celestion G12 Century in a Hughes & Kettner Puretone Cab
Purple is the stock alnico in and Ampeg Jet Cab
Red is an Eminence Legend 12" in Fender Deluxe Cab
Yellow is a Celestion G12 Century in a Hughes & Kettner Puretone Cab
Three things strike me about the stock speaker plot:
• The 90Hz low frequency resonance of the speaker is quite strong.
• The high frequency response is extended above 5KHz.
• The speaker sensitivity is the lowest of all of the four tested.
The low frequency bump on the is certainly not helping the muddiness or lack of low end headroom that characterize the Champion. The next step will be to modify the circuit to limit the low frequency response.
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2 comments:
Great, very useful measurements, thanks a lot!
Have you done anything in terms measuring the loudness with those different speakers? I hear things like 3x louder with a single 12" speaker (even 8 ohms).
The clean is so great that 3x louder almost sounds too good to be true:P
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