That’s probably a moot point, though—experience tells me that most original speakers in amps of that age are substantially fatigued and generally sound very weak. It's a great-sounding speaker, but with a sensitivity rating of 100 d B, it’s relatively efficient and would probably be pretty loud in that amp.
Let’s take a look at a couple speakers from Warehouse Guitar Speakers (wgs4.com) so I can better explain this.
Instead, there were approximately 2000 of these chasses produced, which then ended up as one of the three models in question.
It would be more accurate to say that approx 650 of each of these models were produced in ’60.
Fender has used only a handful of different speaker types over the years.
Here’s a list of brands along with their EIA codes.
If you want the least volume from your amp, search for a speaker in the style you like with the lowest SPL rating.
Another option you might consider: Eminence (eminence.com) makes a speaker called the FDM, which stands for “flux density modulation.” (Yeah, it sounds a little Back to the Future.) It comes in both American- and British-voiced versions and has a very unique feature: a large knob on the rear of the speaker that allows you to adjust the strength of the speaker’s magnetic field, effectively changing its sensitivity. Let’s move on to your Pro Reverb and Twin Reverb amps with hum issues.If you see any data that is not listed here or notice any errors, for 1970’s and earlier Fender amps, please send us an email and we will update the chart.Some things are very obvious such as non-original or reconed speakers, non-original transformers, replaced pots, re-tweed, re-tolex, re-grill, etc.You should be able to find a number stamped somewhere on the speaker’s frame.The format may look like this: 220 637 Here the number 220 designates the speaker as a Jensen, and 637 indicates a production date of the 37th week of 1956 or 1966.Warning: All tube amplifiers contain lethal voltages.