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> Building 2x12 Cabinet For Engl Fireball 100
herrb
post Jan 19 2010, 01:04 PM
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Hey guys!

I'm buying a ENGL Fireball 100 soon and want to build a Cabinet for it. I found an empty one on ebay and now i'm choosing speakers.

What i want to play is a litte Hardrock but mostly Thrash Metal and Hi-Gain sounds.

I'm orientated after the Engl boxes, which i'm surely be buying someday, but for now a 2x12 must do the job. Nevertheless I want it do a very good job ; )

so i think i'm going to use two Celestion Vintage 30 or one Celestion Vintage 30 + CELESTION G12T75 because i heard it's good for Metalsounds. An other option would be a Celestion G12 50M, i heard that combination would sound warmer (with v30), althogh i don't know if this speaker is good for metal.

So i would like your guys to tell us your opinion on diffrent speakers and combinations referring to diffrent sounds!

another question i have is about Ohm. do i need 8 or 16 ohm speakers for my fireball? what does it have to do with stereo or not and loudness?

thanks guys! see you,

all the best, peter
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Staffy
post Jan 19 2010, 01:53 PM
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I think a good idea would be to mix the speakers here, because if You are in arecording situation You have the option of two different sounds.... Speaker brands are a tough topic, it's very personal what one likes... of course with celestion vintage 30's You can never go wrong, but this is really bout trial & error what suits You the best. You can as well try Eminence, Weber and other celestions of course.
If You dont have the opprtunity to try different speakers and compare them, visit Your local dealer, maybe he has some old laying around?
Or buy some used and test them - if You dont like them You can always sell them for the same amount....

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herrb
post Jan 20 2010, 10:37 AM
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*push*

no one another opinion? and can someone please tell me something about ohm?

greetz peter
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Staffy
post Jan 20 2010, 11:12 AM
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QUOTE (herrb @ Jan 20 2010, 10:37 AM) *
*push*

no one another opinion? and can someone please tell me something about ohm?

greetz peter


Ohm is the resistance/impedance that the speakers have. It shall be match to the output resistance of the speaker output of Your amp.
If You are connecting two speakers in parallell, the resistance will be: total resistance=(speaker A * speaker B) / (speaker A + Speaker B), if You connect them in serial (eg. + from the amp to + on the first speaker, minus at the first speaker to plus on the second, minus on the second speaker to minus on the amp) they will have double of the speaker impedance.....

So if You have 2 8 Ohms spekers they will be 16 Ohms in serial
In parallell connection they will be: (8*8) / (8+8) = 64/16 = 4 Ohm

If the amp is marked "100 W in 8 Ohm) and You load it with 4 Ohm instead, it will produce a louder output - but in return You may cause the amp damage since the output transformer may be over-heated..... however its no problem the other way round, but the ideal is to to match the soeaker outputs rating on the amp....

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herrb
post Jan 20 2010, 02:35 PM
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ok, so i use 2x 8hms speakers serial and plug them into 16 ohm slot of the amp, or 8 ohm speakers in parallel and plug into 8 ohm plug of the amp (witch would be louder i think)

what about using 4 speakers? i can't put on a right seeming calculation : (

thanks again staffy!
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jstcrsn
post Jan 20 2010, 02:54 PM
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yes you can , you put two sets of speakers in series and then you make with the two sets os speakers they are in parrallel


2 x 8 ohm in series = 16 ohm in parallel with another 2 x8 ohm = 16 ohm series = 4 speaker 8 ohm cabinet
ps when building a speaker , if you put speakers in a cabinet that was not designed for that speaker it may not sound good until you play around with the depth of the port. get some pvc pipe that fits the port and cut it in different leghts and see how it might change the tightness or muddiness of the sound

This post has been edited by jstcrsn: Jan 20 2010, 03:00 PM
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Ivan Milenkovic
post Jan 20 2010, 04:09 PM
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QUOTE (herrb @ Jan 20 2010, 02:35 PM) *
ok, so i use 2x 8hms speakers serial and plug them into 16 ohm slot of the amp, or 8 ohm speakers in parallel and plug into 8 ohm plug of the amp (witch would be louder i think)

what about using 4 speakers? i can't put on a right seeming calculation : (

thanks again staffy!


Mixed speakers is better option.

Regarding impedance:

1. if you wire 2 x 8 Ohm speakers in serial you get 16Ohm

2. if you wire 2 x 8 Ohm speakers in parallel you get 4Ohm

3. if you wire 2 x 16 Ohm speakers in serial you get 32Ohm

4. if you wire 2 x 16 Ohm speakers in parallel you get 8Ohm


The outputs on the amp are ALWAYS parallel. This means if you have 2 speaker outputs on your amp, you can always use the parallel connection rule to connect two cabs together (for example if your cab is 8Ohms, and you have another cab @ 8 Ohms, then you adjust the head to 4Ohm).

You can cut down option number 3, because no head puts out 32Ohms. SO you are left with options 1, 2 and 4. Between those options personally I would choose number 4, because this way you will have 212 cab that can run in stereo using 2 x 16Ohm speakers, or mono with 8Ohm. Another advantage is that if you wire the connection parallel, and one speaker dies, the second one will at least carry on working, while if you wire in serial, and if one breaks down, the second one wont work as well. I would advise that you wire them using 2 x 16Ohm speakers in parallel. On your head you choose 8Ohm output.

some general rules:

- Never put head working on higher impedance value than the speaker total load cause you may blow the output tranny or other components.
- You can put head work on lower impedance value of the speaker total load, but that is NOT recommended as well.
- Do NOT wire speakers with different impedance values in the same cab. If you buy 1 8Ohm speaker, and 1 16Ohm speaker, sell the 8Ohm one and get another 16Ohm. These two will create impedance ~5.3Ohm, which is not suitable for neither 4Ohm or 8Ohm on the head.

This post has been edited by Ivan Milenkovic: Jan 20 2010, 04:16 PM


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Daniel Realpe
post Jan 24 2010, 02:33 AM
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great advice! ENGL sounds really rocking!


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