Depending on the wattage your amp is pushing, try getting one rated for much higher volume levels.
That "should" give you a bit more headroom before break up.
Celestion Gold is one of the best all round speakers there is – but in some amps it is just too bass heavy.
And dispite "everyone" hates Jensen Reissues, they are brilliant in some amps in some music style.
I mean that helios, I can't answer to Your question if You don't tell what amp are You talking about! It is impossible to say that "alnicos are warmer" or "ceramics are brighter".
I mean that helios, I can't answer to Your question if You don't tell what amp are You talking about! But on the other hand, one's 'dark' is 'warm' to next one.
The JBL would be good for a 100 watt amp to get the clean smooth Jazz tone I get from the Webber at 25 watts, the Webber is rated at 30 watts but it works for me as I do some blues too with that amp. Bob I had a Jensen Jet Blackbird Al Ni Co in an Allen Sweet Spot (Princeton clone) that I just sold. Sent from my i Phone using Tapatalk Celestion Gold is a great speaker.
Very warm sound and the amp buyer (a jazz guitarist) is similarly very happy with it. Has a little bit of a upper-mid range honk the more you push it.
It would be the stock Celestion 12" 90 watt (type MC-90) in the Mesa Mark V 35 that I would change.
(Oh-la-la, first smiley I use in my forum post in internet ever! I have never had experience with Peavey Delta Blues nor the Mesa Mark V 35 so I cannot give You a straight answer – if there is such. The Peavey Delta Blues has a 15" Weber ceramic Blue Dog speaker.
So my second question is: what is it You do not like in their stock speakers? It would be the stock Celestion 12" 90 watt (type MC-90) in the Mesa Mark V 35 that I would change.
Would the expression 'attenuated in the upper register' be more exact?
(Oh-la-la, first smiley I use in my forum post in internet ever! Nice to see here people from exotic northern countries too! The Celestion Cream Alnico has much of the same attributes with higher power handling, 90W, if I recall.