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Post subject: switchable ohms 0n my deville?????
Posted: Fri Nov 16, 2007 8:37 am
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apparently my fender deville 2x12 combo has switchable ohms ,, can someone explain how a person switches them/?Rock on!! dave


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Post subject: Re: switchable ohms 0n my deville?????
Posted: Tue Nov 20, 2007 11:56 am
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brigadier1 wrote:
apparently my fender deville 2x12 combo has switchable ohms ,, can someone explain how a person switches them/?Rock on!! dave


not externally or manually switchable. with the internal speakers plugged in, there is a 4 ohm load. when you plug another external cabinet into the external speaker jack, that load is paralleled with the internal speakers.

The minimum impedance of an external cabinet cannot be lower than 4 ohms... which, paralleled with the internal speakers would be 2 ohms.

using an 8 ohm external cab would result in:

inverse of (1/8 + 1/4 = 2/12) = 6 ohms

using a 16 ohm external cab would result in:

inverse of 1/16 + 1/4 = 2/20) = 10 ohms

however, speaker loads higher than 4 ohms results in lower power output and a resulting lower volume


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Post subject: the manual suggests
Posted: Tue Nov 20, 2007 1:59 pm
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the manual for the deville mentions a dummy plug,, although thats where they lost me,, so with the internal speakers plugged in like it is now if i add a fender fm 4x12[which i have ,, i also have a jackson 4x12 that is 4 ohms when plugged into mono{stero is 8 ohms}} i will be at 4 ohms across the board??? note fender cab says 4 ohms on it,, thank you for going over this with me as my head starts spinning when an ohms conversation happens rock on Dave


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Post subject: Re: the manual suggests
Posted: Tue Nov 20, 2007 2:20 pm
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brigadier1 wrote:
the manual for the deville mentions a dummy plug,, although thats where they lost me,, so with the internal speakers plugged in like it is now if i add a fender fm 4x12[which i have ,, i also have a jackson 4x12 that is 4 ohms when plugged into mono{stero is 8 ohms}} i will be at 4 ohms across the board??? note fender cab says 4 ohms on it,, thank you for going over this with me as my head starts spinning when an ohms conversation happens rock on Dave


the dummy plug is just a 1/4 plug with no cable attached (or a short patch cable with the other end taped over to prevent shorts). when inserted into the ext speaker out, it tricks the output section into thinking there's an extra cabinet attached and drives the power tubes/transformer with a 2-ohm load, which essentially runs the power tubes harder. I dont really see a need to do this and trying to get power tube saturation out of a deville is not like getting it out of an old non-master marshall.

If you plug in a 4-ohm extension cabinet (into the mono input), this is wired in parallel with the internal speakers... getting a total of 2-ohm load.

However, just remember that even though you may be running more speakers (and a bit higher output)... that total wattage will now be divided among more speakers... so instead of 60 watts going into 2 speakers (30 watts each), you'll then have 60 watts going into 6 speakers (10 watts each)... which means that each speaker isn't being pushed as hard.

On the other hand, you'll be getting different tones out of the 412 than you would out of the combo speakers. Tighter low end, due to the closed back cabinet, also more projection and punchier; for the same reasons.


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