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Post subject: Question: matching an amp with the correct extension cabinet
Posted: Sat Nov 14, 2009 5:37 am
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Aspiring Musician
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Is there a problem with using a 16 ohm extension cabinet with an amp having an 8 ohm speaker extension jack?

My amp is a Fender Princeton RI.


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Posted: Sat Nov 14, 2009 6:48 am
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Roadie
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No.

As I understand it, you can go 8 ohms amp / 16 ohms speaker, or 4 ohms amp / 8 (or 16) ohms speaker – but not the other way around.

I think you just end up with less volume at the speaker than if you'd matched 8 ohms to 8 ohms etc, but I'm sure someone will chip in with the technicalities.


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Post subject: Re: Question: matching an amp with the correct extension cab
Posted: Sat Nov 14, 2009 8:36 am
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Guitarist1983 wrote:
Is there a problem with using a 16 ohm extension cabinet with an amp having an 8 ohm speaker extension jack?

My amp is a Fender Princeton RI.


This is right from the manual

Plug-in connection for an external
speaker. This jack is wired in parallel with the INTERNAL
SPEAKER JACK {M} and affects the speaker impedance load.
Use 8Ω minimum total. To use the external speaker output, first
disconnect the internal speaker. Then connect a 16Ω speaker
load (minimum) to the internal speaker jack and another 16Ω
speaker load (minimum) the external speaker jack.

Seems like it wants to see 8 ohms. Be careful. You don't want to smoke the output tranny.


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Posted: Sat Nov 14, 2009 2:27 pm
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veryslowhand is correct. It will not hurt an amplifier(of any kind) to run a higher impedance speaker(s). It just might not be as loud, and could possibly change tone a little bit. Some amp companies, like Mesa/Boogie, actually suggest experimenting with mismatched speaker impedances (as long as the speaker(s) was greater than or equal to the suggested impedance). Also, if using more than one speaker/cab, make sure to calculate the total load the amp sees. There are several web sites that provide speaker impedance calculators. Rockfordfosgate.com is the one I always use.

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Posted: Sat Nov 14, 2009 2:53 pm
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Why loose the power as well as headroom?


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Posted: Sun Nov 15, 2009 12:53 pm
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63supro has a good point. Although it wouldn't hurt the amp to run a higher impedance speaker, I would certainly use the recommended speaker impedance.

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PRS Custom 22 with solid rosewood neck
Mesa/Boogie Electra Dyne 1x12 combo
DRRI


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