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Thread: Convert 1x12" 8 ohm to 16 ohm guitar speaker

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    Convert 1x12" 8 ohm to 16 ohm guitar speaker

    I'm considering to convert a 1x12" 8 ohm guitar speaker cabinet to match my 16 ohm amp. I will buy a new 12" 16 ohm speaker to fit in the cab. Would I have to replace the wiring of the speaker output as well? Or could I simply fit the new speaker in?

    This is the speaker I'm looking to buy:

    https://www.gear4music.com/us/en/Gui...r-Cabinet/2Q9A

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    Wow thatís cheap!
    The existing wiring should be fine, just swap in another speaker. Careful when removing the female spade connectors, you donít want to force things and have them open up, thereby losing grip in future. There may be locking tabs on the spades to latch them in place / prevent them being pulled off accidentally; so they may need prying open with a small flat screwdriver.
    Regarding your amp, maybe it has an unused 8 ohm output on the output transformer?

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    Thanks for the tips. It's dirt cheap indeed. Even if you throw away the speaker and just use it for the cab.

    The amp is a Marshall DSL1CR, it only has one 16 ohm output.

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    It's worth giving the OT a close examination, there may be an unused 8 ohm wire or terminal available.

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    Old Timer J M Fahey's Avatar
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    Irt definitely might, so itīs worth checking.

    That said, I guess today_not_so_popular 16 ohm choice by Marshall (an d some Laney and Vox amps, all "British" *may* be to push users to get some 16 ohm Marshall cabinet or at least a Celestion 16 ohm speaker.

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    Juan Manuel Fahey

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    Old Timer olddawg's Avatar
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    Just curious as to why you are doing this? An 8 ohm load on a 16 ohm tap is no different than having a 16 ohm main speaker and a 16 ohm extension cab. A one level mismatch is common. I doubt that using an 8 ohm speaker on a 16 ohm tap will cause any problems. Itís done all of the time.

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    Don't forget the joker g1's Avatar
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    Quote Originally Posted by olddawg View Post
    An 8 ohm load on a 16 ohm tap is no different than having a 16 ohm main speaker and a 16 ohm extension cab. A one level mismatch is common. I doubt that using an 8 ohm speaker on a 16 ohm tap will cause any problems. Itís done all of the time.
    In this case (DSL1) they don't offer any ext. jacks (head or combo) and specifically warn about possible OT failure if used with loads below 16 ohms. They don't seem that confident about it, and I'd suspect they would void warranties over the issue if someone were to admit it.

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    Old Timer olddawg's Avatar
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    Quote Originally Posted by g1 View Post
    In this case (DSL1) they don't offer any ext. jacks (head or combo) and specifically warn about possible OT failure if used with loads below 16 ohms. They don't seem that confident about it, and I'd suspect they would void warranties over the issue if someone were to admit it.
    Odd... If I had enough volume.. I would just put an 8 ohm resistor in series with the 8 ohm speaker then. At least try it before changing the speaker. A lot cheaper and may be just fine.

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    I would just put an 8 ohm resistor in series with the 8 ohm speaker
    That would be a simple power attenuator. The series resistor wll dissipate up to 50% of output power.

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    Old Timer olddawg's Avatar
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    Quote Originally Posted by Helmholtz View Post
    That would be a simple power attenuator. The series resistor wll dissipate up to 50% of output power.
    Well.. sort of. The perception of volume will not be 50% less... especially if the amp isnít dimed.

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    Senior Member vintagekiki's Avatar
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    Quote Originally Posted by retool View Post
    I'm considering to convert a 1x12" 8 ohm guitar speaker cabinet to match my 16 ohm amp. I will buy a new 12" 16 ohm speaker to fit in the cab. Would I have to replace the wiring of the speaker output as well?
    Only correctly connects the speaker with various resistance to the amplifier is via the impedance matching transformer.

    http://www.voxsupreme.org.uk/vox_multi_link_transformer.html

    https://www.tonefactory.nl/impedance-matching-transformer-marshall-original-nos-used-in-models-2200-and-2098

    https://drtube.com/schematics/marshall/2200-pwr.gif

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