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Post subject: how loud must Pro Jr be to overdrive w/ 75 watt spkr?
Posted: Fri Jan 22, 2010 2:17 pm
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Aspiring Musician
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i've been speculating about replacing the speaker in my Pro Jr. i'm really leaning towards the Copperhead right now.

as you know, its a 75 watt speaker with 99 db sensitivity. i was wondering if anyone could tell me about how far up the volume dial i need to go on an amp such as a Pro Jr in order to get breakup. (i guess any low-watt non-master volume amp would apply here.)

going along with that, here's a noob question that would help me. would the amp overdrive still kick in with or without speaker breakup? i'm assuming i'll still get power tube drive in around the same place on the volume dial, just with less spkr breakup. correct?

hows this work? i'm new to this stuff. thanks.


also...in terms of chime and brightness, how different will the copperhead be compared to the stock eminence ceramic? smaller the difference, the better. i like the chime, but i want a speaker that will hold up at high volumes. the stock speaker sounds great until you get to diming territory.


Last edited by msvolpe on Sat Jan 23, 2010 10:48 am, edited 1 time in total.

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Posted: Fri Jan 22, 2010 3:06 pm
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another question. will this speaker go right in? or will i have to modify the baffle at all? such as drilling new mounting holes or something like that?

i hope the speaker is ready to install without me having to modify anything


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Posted: Sat Jan 23, 2010 10:47 am
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let me re-word this a bit, incase anyone has been trying to help....

with a 15 watt non-master volume amp, such as the fender pro jr, the overdrive starts kicking in around halfway up the volume knob (give or take a bit). will i still get that same overdrive response at the same place on the volume knob with a more effcient speaker, having 75 watts? in this case, it would be tube overdrive if anything, and my thoughts are yes, but i have to ask because i'm a plain rookie with low experience. bear in mind that the speaker i have now (stock) is only 25-30 watts, so i guess part of the question would be how much speaker breakup is contributing to the overall overdrive i achieve on the Pro Jr.

here's my concern...i dont care about massive headroom, i kinda like it the way it is now, so i dont want to have to crank the volume higher in order to achieve the same amount of overdrive i can get now, you know what i mean? i was worried if a drastically more efficient speaker might "tame" the amp.


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Posted: Sat Jan 23, 2010 11:55 am
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Great questions. If the new speaker is more efficient and I'm sure it would be, you would probably get the same breakup but it may be perceived a little louder because the speakers more efficient but, I'm not sure if you were getting speaker breakup from the stock speaker. I run two Celestion Elite Custom 80 speakers in my Egnater rebel 20. It's only a 20 watt amp, but the speakers are rated at 80 watts each. I get great breakup, but it obviously coming from the amp not the speakers. I think if a speaker's breaking up, it won't last too long. I wish I could give you a definitive answer. I think you'd just have to give it a try.


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Posted: Sat Jan 23, 2010 1:10 pm
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thanks supro. you've been my "tutor" on several threads in the past week haha

anyway, thats what i want exactly. i want overdrive at the same place on the volume knob. i don't want drastically more or less headroom than i have now. maybe a tad more headroom would be nice, so i'm not worried about that happening. also, i'm aiming for the extra volume, so that's a plus.
so if i can get my amp louder, with overdrive at about the same place on the knob, then that will make me happy. i believe you confirm that from your post?

i know that trying is the best way to learn, but i wanted to get the facts straight before buying anything. interesting about the 2 80w speakers on a 20w amp...i guess that should be proof that i have nothing to fear...

if i'm understanding correctly, that settles the wattage. now its back to the tone quest...argh


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Posted: Sat Jan 23, 2010 1:38 pm
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Speakers are very personal; what one person perceives as great can be dreck to the next.

I'd find a local shop (not Guitar Center) that carries these speakers and bring your amp over - he may have them in another enclosure so you can run speaker wire from your amp to the speakers. Not totally ideal, but much better than pulling your Pro Jr. apart and then finding you're not as happy with your tone.

Not sure where you're located, but plenty of good local shops.

Article on a guy who swapped out his speaker for a Weber. I have a 10" Weber in my Princeton and a Jensen ceramic in my Princeton Reverb and amp happy with both.

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Posted: Sat Jan 23, 2010 11:30 pm
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Yeah Volpe, the speakers are way personal. I tend to only run speakers that are twice the output wattage of the amp. That's because my amps are parallel twin speaker set-ups, and if one speaker should fail, the other should keep the output section in a safe zone. The only drawback of my conservative approach is that the amp never gets the chance to really push the speakers to their max potential. Take a Matchless DC-30 and two 15watt Bulldogs, and you can tell they are working full time. My point is that with over-rated speakers, the distortion is derived from the amp and it only tickles the speakers. They become more of a reproduction,rather than a production part of the amp. This is just my uneducated experience. Maybe Supro has tried lower watt speakers with his amp, or can get Bruce Egnator's opinion on why the 80watt speaker works best for the 20watt amp. Art

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Posted: Sun Jan 24, 2010 7:47 pm
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Aspiring Musician
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thanks...btw, i'm starting to lean toward the Legend 1058 now...i'm so indecisive.

got a question...by any chance, are the stock speakers in the blues jr and pro jr already Legends? if so, i certainly wouldn't buy one. i read somewhere that its possible that the stock speaker IS a Legend. maybe they were confused? can anyone tell me what the story is there?


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