What do Celestion G12 speakers sound like? - diyAudio
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Old 29th April 2011, 05:37 PM   #1
tmblack is offline tmblack  United Kingdom
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Default What do Celestion G12 speakers sound like?

Hi
I want to make a stripped down Vox AC15 amplifier and need some speaker advice.
Seems the Celestion G12 Blue (alnico) is all the rage but what do all these G12 speakers sound like?
Are they clear and linear like a hifi speaker?
The Vintage 30 sounds like it has a good midbass response and rolled off highs.

Are there any recommendations?

Thanks

Tom
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Old 29th April 2011, 09:03 PM   #2
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try here:

YouTube - celestion
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Old 29th April 2011, 09:29 PM   #3
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Where are you in your AC15 build? Got a schematic in mind?
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Old 29th April 2011, 09:49 PM   #4
tmblack is offline tmblack  United Kingdom
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I'm thinking of using existing 12ax7 preamp and el84 push pull amp I got here. Don't want to rebuild with the EF86 if I can get away with it.
No tremolo or reverb stage.
And a single 12" Celestion Vintage 30 speaker sounds like the sound I want sort of vintage Jimmy Page.
Celestron Blue are way too expensive for me and the V30 does the trick based on the videos.
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Old 29th April 2011, 09:57 PM   #5
tmblack is offline tmblack  United Kingdom
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What is the original G12? I read it was originally for hifi.
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Old 30th April 2011, 11:40 AM   #6
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The Celestion Blue predates hifi and was meant for console radios. It's a major part of the Vox sound, and while pricy, it's one of the few speakers that have that chime.

Same is true for the EF86. If you use a 12AX7 and a V30, you're going to build more of a Marshall than a Vox.

You might try one of the Wharfdales Vox now imports from China. The other suggestion would be a Weber ceramic version of the Blue, called the Blue Dog.

https://taweber.powweb.com/weber/


I'm a big fan of the alnico sound, however, and for a Vox clone I'd use one of these:

12" Black & Blue alnico - 15 Watts | Warehouse Guitar Speaker

Costs more than the ceramics, but not as much as a Celestion. But it definitely has the chime and compression that's part of the signature Vox tone.
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Old 2nd May 2011, 05:20 PM   #7
tmblack is offline tmblack  United Kingdom
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I got the EF86, funny the new AC30CC uses 12ax7 only.
Is there a benefit to using 2x12" speakers or just 1x12"?
Should it be 16 ohms in parallel, 2x8 ohms in series?
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Old 2nd May 2011, 07:19 PM   #8
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Quote:
Originally Posted by tmblack View Post
I got the EF86, funny the new AC30CC uses 12ax7 only.
Is there a benefit to using 2x12" speakers or just 1x12"?
Should it be 16 ohms in parallel, 2x8 ohms in series?
Don't most combos usually run on 8 ohms ?
But in my opinion , 2 speakers is and are always louder then 1 speaker , depends on what you like ...
i know i have no place here thanks to my hate for tubes , but still , i can talk speakers .
That said , i prefer the sound of modern speakers with high efficiency .
Maybe back then the best sounding were low power , celestion's . ( Yes i hate celestion ) .
The reason why most combos and cabs were open back , because woofers are really bassy , and i can attune for that , my combo , a 30W has a 10' and is really bassy and is a sealed box . ( in fact it has nearly no top-end due to being 1 woofer only w/o a single tweeter )
It gets worse if it has a port ... the whole thing is sealed with screws that are strategically placed but if i cut a port , it will just get overly bassy ... Time for bi amping if i do any serious guitaring on it ( Is it worth it ? )
Oh i just found out , the AC30 is indeed 16ohm , and is always operated on their brink of collapse , you could do 2 things , make sure the output tranny is 8 ohms if you want to parallel it , or get a 2 higher rated speakers similar to the one offered by WHG above by Keriwana .

Last edited by DJDestiny; 2nd May 2011 at 07:21 PM.
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Old 2nd May 2011, 09:28 PM   #9
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Quote:
Originally Posted by DJDestiny View Post
Don't most combos usually run on 8 ohms ?
But in my opinion , 2 speakers is and are always louder then 1 speaker , depends on what you like ...
Speaker impedances have changed with technology.

Historically valve amps used 16 ohm speakers, it made no difference what impedance you used, because you HAD to use transformers, so the transformer was wound to match the speaker.

With the advent of transformerless transistor amps, the situation changed completely - speaker impedance was now critical, and output power entirely dependent on it. Because of the lower voltage used 16 ohm were too high, so 8 ohm became the norm, with 4 ohm for lower voltage amps (such as in-car, with only 12V supplies). Over the past decade or two, Sony stereo systems have rather bizzarely tended to use 6 ohm speakers though?.

The exception of course was (and still is) announcement type PA systems, where the common use of 100V line systems means transformers are still used, so just as with valve amps you can tap off for any impedance speakers you want.
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Old 2nd May 2011, 11:25 PM   #10
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Quote:
Originally Posted by tmblack View Post
I got the EF86, funny the new AC30CC uses 12ax7 only.
Hate to say it, but that's because 12AX7s are cheaper, and more widely available. Dr. Z used EF86s as his secret weapon when he started out. It has a much sweeter breakup than a 12AX7.

Quote:
Originally Posted by tmblack View Post
Is there a benefit to using 2x12" speakers or just 1x12"?
Two speakers will be louder in a big room (more surface area), and they have a nice phase interference pattern. Some prefer the more focused sound of a 1x12. And of course, 1x12s are lighter.


Quote:
Originally Posted by tmblack View Post
Should it be 16 ohms in parallel, 2x8 ohms in series?
Doesn't really matter that much with two identical speakers. There are those that think the rougher sound of series wiring is preferable. Parallel wiring smooths out the (production tolerance) differences in impedance more.
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