not much difference
I own and love the Deluxe Reverb Reissue with the same Jensen P12Q alnico speaker. All the reviews I read said it was a little warmer at low volumes and broke up earlier (past 5). Since it sounds like you're after clean tones and not overdriving the amp, this is a moot point. At 22 watts, the DRRI is very loud- mine is usually running at 2 1/2. At 15 watts, the PRRI is perfect for what you want. I also have the cannibis rex speaker which I put in an an old Blues Junior to calm the icy pick spiky highs. It is a smooth sounding speaker that is quite efficient and can put out very powerful sounds from a 15 watt amp, again not really a consideration for you. The alnico has a slightly broader range and will give you a little more sparkle and harmonic content if your looking for a more open spatial sense. The c-rex is a great blues speaker. BTW, as you know, the Princeton Reverb has a fabulous sound and you can't go wrong with either one, just a very slight difference in the taste.
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