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Old 10-20-2012, 08:48 PM   #1
constepatdyak
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Question How much louder is a 40W compared to a 15W?

Hi, i want to change to a Roland Cube XL40W amp from an old roland Cube 15W, will it be 2.5x louder than the 15W or is that not how amps work? On the 15W, my volume bar is usually on 2 out 10.

Thanks alot guys, cheers.

Last edited by constepatdyak : 10-20-2012 at 08:49 PM.
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Old 10-20-2012, 08:58 PM   #2
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Doesn't sound like a smart move unless it has more effects.

It's not that much louder.
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Old 10-20-2012, 08:58 PM   #3
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You could turn your amp up :shrug;
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Old 10-20-2012, 09:05 PM   #4
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Unless the XL40W has specific features that the 15W doesn't (Maybe a larger speaker? More effects?), I would save your money.
Its not going to be that much louder, Maybe a few DBs, but nothing that noticable unless you are in a band situation.
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Old 10-20-2012, 09:07 PM   #5
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I'm pretty sure somebody on here said that you have to have like 10x the power to double the volume. If this is all about volume, just turn your knob up.
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Old 10-20-2012, 09:11 PM   #6
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I would say go for it. The 40XL is going to give you much more modeling features. You can get a good sound at bedroom levels with any of the Cubes.
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Old 10-20-2012, 09:13 PM   #7
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Quote:
Originally Posted by constepatdyak
Hi, i want to change to a Roland Cube XL40W amp from an old roland Cube 15W, will it be 2.5x louder than the 15W or is that not how amps work? On the 15W, my volume bar is usually on 2 out 10.

Thanks alot guys, cheers.


if you run both amps at their nominal output then the 40 watt amp would be about 1.4 times louder than the 15 watt amp.

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Originally Posted by Viban
I'm pretty sure somebody on here said that you have to have like 10x the power to double the volume. If this is all about volume, just turn your knob up.

+1

if you are only on 2, then you aren't even using all the volume of the amp you have. why would you need more?
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Old 10-21-2012, 01:10 AM   #8
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I think we are looking at the wrong end of the stick.
The 40W will be a bit louder at full volume but it will also be capable of being turned down to the levels you are used to.
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Old 10-21-2012, 01:41 AM   #9
constepatdyak
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Yeah, thanks. The 15W doesn't have any modelling or much features, and I have a great deal on the 40W XL.

-I'm not upgrading for the volume, but more for the benefits of extra modeeling and effects the 40W has, and I can get a great deal on it for $220.

Thanks guys for your answers, I'm buying right now

Last edited by constepatdyak : 10-21-2012 at 01:42 AM.
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Old 10-21-2012, 03:01 AM   #10
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like people have said, the wattage doesn't make much difference to volume but I'm assuming the 40w will have something like a 12" speaker vs an 8" or 10" in the 15w.

the 40w will definitely give a "bigger" sound, even if its not actually that many extra decibels.
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Old 10-21-2012, 03:45 AM   #11
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Clean headroom, the 15 watt has none, it breaks up at bedroom levels


And due the the larger speaker, I'd call this a worthwhile upgrade

Last edited by seljer : 10-21-2012 at 03:46 AM.
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Old 10-21-2012, 04:17 AM   #12
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Quote:
Originally Posted by Diamond Dave
like people have said, the wattage doesn't make much difference to volume but I'm assuming the 40w will have something like a 12" speaker vs an 8" or 10" in the 15w.
Yup, the simply move more air. The inverse square law attaches to cone area vs cone excursion.

Quote:
Originally Posted by Diamond Dave
the 40w will definitely give a "bigger" sound, even if its not actually that many extra decibels.
A larger amplifies virtue is that it can ordinarily change more voltage, faster, than can a smaller amp. It's a spec called "slew rate".

I think that's what you're referring to, at least in part, when you say, "bigger sound'. A higher slew rate, translates to better dynamics in the signal. The clean headroom and a higher rate of voltage change, puts the "pop" into the sound. A loudspeaker with a faster transient response helps out a bunch too.
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Old 10-21-2012, 06:13 AM   #13
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slew rate has nothing to do with wattage.
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Old 10-21-2012, 08:39 AM   #14
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i would say roughly 3-4 DBs, which is significant to a degree. not a crazy amount but loud enough for people to hear a difference.

really the main difference is headroom. 40 watts will stay cleaner louder.
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