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pinky78 27th April 2007 07:13 AM

Celestion G 12-p80 **seventy Eighty**
Can anybody tell me are this spkrs suitable for a tube amp?
they are my only choice becouse in macedonia there is no other distributor for celestion, and this one has only seventy eighty and vintage 30 (which are very expensive for me :) )

alan-1-b 27th April 2007 02:33 PM

Electric Guitar loudspeaker
Hi pinky78,

The Celestion G12P-80 , "Seventy 80" is an Electric Guitar speaker, and is basically a cheaper version of their G12T-75, but that does not mean its no good - it will be OK.
Only slightly smaller magnet than than the G12T-75, but good efficiency at 98dB/watt/metre, and with 80 watts power handling it will work with an Electric Guitar tube amplifier of up to about 50 or 60 watts OK.

The "Vintage 30" is a specialist model for a specific type of sound - leave that one till you get going with amps and speakers for a while, and try one or two G12P-80s for now.

I see that model is available in both 8 ohm and 16 ohm Impedance versions, thus do check that the version you buy is the Impedance required to match the tube amp you want to use it with.
Most guitar amps are 8 ohm, though some are 4 ohm, and you would need to run two 8 ohm speakers in parallel for correct load for such amps.
Some tube amplifiers have switchable Impedance - on the back panel - and can be any two or all three of :- 4 ohm ; 8 ohm ; 16 ohm switched.

What did you specifically intend to do ?


pinky78 27th April 2007 10:06 PM

First thanks :)
I want to do 2 speaker cabinet for 50W tube amp. I play mostly hardcore/grindcore and punk so I need more agresive sound, but also like good clean as well :)
I may get my hands on celestion g12m70. Are this better or not?
Which of this two you think will be better choice for me?

alan-1-b 4th May 2007 03:47 PM

Celestion Electric Guitar Speakers
which Celestion models have been available in Macadonia over the years ?

The original Celestion G12 electric guitar speakers were fairly low in Power rating.
After some years of development two models were introduced which became very popular, and from these most of Celestions' electric guitar speakers to date were developed:-

G12M - originally a 25 watt speaker, and currently re-issued as "G12M-Greenback" - Greenback refers to the colour of the plastic magnet cover.
M is the magnet size weight - 35 oz.

G12H - originally a 30 watt speaker, and is currently re-issued also.
H is the larger magnet size weight - 50 oz.

From the G12M the later models with the M size magnet are :-
G12-65 ; G12T-75 - both with the 1 3/4" diameter voice-coil.

Also with the M magnet were manufactured :-
G12-50 ; G12-70 - both with 1 1/2" diameter voice-coil,
V12-80 ; G12T-100 ; Hot 100 -{a current cheaper priced version}-, all with 2" diameter voice coil.

The different voice-coil diameters create a different tone for each even when attached to the same type of cone.

With its 1 1/2" voice coil the G12M-70 -{you wrote you may be able to get}- you will get slightly more emphasized upper-mids and treble than with one of the 1 3/4" or 2" M type alternates.
This will probably suit the types of sounds you mentioned, BUT, part of those sounds depends on the type of Amplifier also.

G12M-70 was a more expensive speaker than "Seventy-80" -{relative to Inflation}, thus likely better made, thus IF the ones you are offered are in good working condition then buy those, but do try them to ensure they work if they are 2nd hand, and that you do like their tone.
Also their 35oz magnet will give a slightly tougher sound than the 30oz magnet of the Seventy-80, but still not too "controlled" such as happens with the H size 50oz magnet models.
Players who prefer the 50oz magnet models tend to like a tight bass sound and controlled mids, either for clean sounds, or for use when a lot of Effects' Pedals are used for various distortions and tone effects.
The M size magnet models give better sustain when simply driven hard by the amplifier than the H size, with-out added pedals, etc ...

The 50oz H magnet models are:-
G12-H ; Vintage 30 ; G12-80 -{now re-issued as "Classic Lead"} ; G12K-85 ; G12H-100.

There are several models with smaller magnet size and weight than the M and "Seventy-80", but I do not recommend those for the music types you listed because the small magnet speakers tend to get too soggy in their response when driven hard, and only 2 of those in a cabinet may be too low in volume level, regardless of how much you turn your amp up !

Thus, of the 3 models you mentioned, I recommend the G12-70, but what Impedance are they each ?
What Impedances can your amp be set to drive ? - look on the amp's back panel to see if an Impedance Selector switch.

If there are any good working condition 2nd hand speakers for sale of any of :- G12-65 ; G12T-75 ; V12-80 , I would recommend those also for your listed music types, as all these models sound good for Rock music styles, even with their each slightly different sounds.

Are you buying the 2x12 cabinet or making it yourself ?

Have you heard the differences in sound between Open back and Closed back cabinets with your preferred types of music ?


pinky78 14th June 2007 03:30 PM

hey there

I finally have a cabinet!
It's ok

I used 2 seventy 80 and they are great!
I made it from cheap board becouse i found some free :)

anyway, I think i should open it a little bit becouse I feel like the sound wants to come out :)))))))))))))))))))))))))))))))

Thank you all for the info


alan-1-b 22nd June 2007 02:46 PM

I'm pleased you got a pair of Celestions, and have got some sound happening with your own cabinet !


Originally posted by pinky78

I finally have a cabinet!

anyway, I think i should open it a little bit becouse I feel like the sound wants to come out :)))))))))))))))))))))))))))))))

It seems you have made a closed back cabinet , yes ?

The sound will change in ways depending on by what amount you "open it" .
I suppose you intend to open the back of the cabinet -{not the front}- ?

All the dimensions of the cabinet affect the sound - especially the internal Height ; Width ; Depth , and then the size of the opening in the back -
-{don't open the front, unless it is a very large front cabinet in comparison with the area of the front occupied by the 2 speakers}-
- and where on the back panel you cut the opening.

If you like, post all 3 Internal dimensions here, and I'll suggest a size of opening and where on the back panel, for a start.
You can increase the size after you hear the effect of the first cut-out.

Do you want Louder ? , or only more Bass ? , or , to spread the sound around more ?

Substitute 5th December 2010 02:03 PM

Hi Alan,
Am new to this forum so apologies if I'm jumping on the back of another query, but you seem to really know your stuff so was wondering if you can help. I've just bought a Celestion G12P-80 and want to use it as an extension speaker for a Peavey Classic 30 1x12" combo amp as i can't find the proper peavey extension cab anywhere. I've bought this speaker as it is 16ohm which I believe is correct and am planning to fit it into an old Marshall combo that I have (and just plug the hole where the amp was - do you foresee any problems in me doing this? Any help appreciated.

alan-1-b 7th December 2010 01:20 PM

about the Peavey and Marshall ?
"substitute me for your Mum,
at least I'll get my washing done"

Hi Substitute,

'oi, wot is all this Peavey biznus ... where is your Hi-Watt ?
... well, if you are going to name yourself "Substitute" .. !
OK, at least you are considering using a Marshall extension cab, so all is not 'opeless 'ere ...

I have forgotten some details about Peavey's Classic 30, thus please Post here:

(1) - What is printed on the back of the amp section of the combo, or in the combo's User Manual, about Minimum Impedance load for total of all speakers connected ?
... or is there an Impedance Selection switch on the back of the amp section ?

(2) - What is printed on the back of the speaker that is in the Peavey combo ?
... both the name and number of the speaker, and its Impedance ?

I have a Peavey branded 12" speaker which is very like a Celestion,
and likely is made with all Celestion parts, but probably assembled for Peavey by Eminence in the USA.
I have forgotten its name and model number -{I will look later}- but I do remember that it is an 8 ohm speaker, thus why I ask what yours is ...
I have forgotten which Peavey amps this speaker was used with, but it may have been with yours, thus why I ask its name and number.

Yes, "plug the hole where the amp was" ... I have done this with a Fender combo's cabinet.
{well, Pete T. does use Fenders now}
I used 1/2" thick wood and completely filled the hole, and painted the front of the wood black.

What is the internal Width, Height, Depth of your Marshall cab ?
... and is it open or closed back ?

I ask the above so I get predict its likely bass and lower mids' performance with the Celestion.

I am presuming the Peavey cab is open backed ... yes or no ?

'oi, where are you, you have not included a Flag with your name !

Substitute 7th December 2010 08:18 PM

Hi Alan
You're right, I should be trashing a HiWatt, not using a Peavey, but got to look after my back mate!
First of all, thanks for the reply, hopefully this is the info you need:
There's no impedance switch, but the Peavey extension cab that goes with this amp (the one I can't find anywhere) is a Peavey 112e which is 16ohm.
Speaker in the combo is a Peavey Blue Marvel pro performance rated 16ohm
Number underneath is 70777144 (means nothing to me though!)
On the back of the amp case (near speaker ext socket) it says 30 watts 22vRMS 16 ohm minimum load.

The Marshall is open back but I intend to close it off as I've heard that would be better, but the peavey combo is open back.

Hope all this helps!
Thanks again

chris661 7th December 2010 08:39 PM

Closed back vs open back is usually a personal preference of the musician's.

I prefer open backed, as my previous experience with closed-back designs wasn't great (tried Marshalls, and my own design, with an Eminence speaker). The bass on both wasn't great, with the latter particularly displaying a very one-note midbass, around the 5th fret of the low E-string. The response fell off quickly below that.

I took the back off the cabinet, and found this bump in the response disappeared, but there was a slight lack of warmth. Turning the bass up to ~7/10 sorted this, leaving a fairly vintage tone. Smooth and warm, but adding distortion allows me to get a great sound, too. The rearward reflections made the sound more interesting, too.

Like I said, it's personal preference. Try it open and closed, see which you prefer.


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