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Can I use an 8ohm earpiece instead of speaker? Effects Pedals, Units & Accessories
Old 6th December 2014
  #1
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Can I use an 8ohm earpiece instead of speaker?

Hi,

I'm looking to record my guitar through a DI box that takes it's output from the speaker end of a valve amp. To this end I have a Behringer Ultra-G DI box which can take an amp output up to 3000 watts (my amp is just a 5w valve head).

To avoid blowing the amp it still needs to be connected to a load as well as the DI box and the head has 4, 8 and 16 ohm options. I have a 4ohm speaker I can connect it to, but it's still too loud and is not required at all for my purposes, so I could buy or more likely build a L-PAD power soak such as here:

Guitar Amp "power soak"

I'm not really trying to reduce the volume to the speaker, but eliminate it altogether, could I just use an 8 ohm mono earpiece instead of the speaker? e.g.

Can I use an 8ohm earpiece instead of speaker?3.5 MONO Jack Magnetic Earpiece Earphone 8 OHMS - 1M | eBay

Many thanks
Adrian
Old 31st December 2014
  #2
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if you want to blow the output transformer of your tube amplifier, you can use the earpiece...

i don't know about the beringer DI, but if it can handle 3000 watts like you say, i don't see why you would need to connect it to a speaker as well ?
otherwise, you could use a big wattage resistor IN SERIES with your DI.

to be safe, make sure to choose a resistor rated minimum 3 times the output power of your amplifier, and make sure the value of the resistor (load) is equal or larger than the amplifier output impedance.

if you don't know what you're doing, don't it.
Old 31st December 2014
  #3
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jimbridgman's Avatar
Just find one of these:

PDI03 Palmer MI PDI 03 - Speaker Simulator with Loadbox 8 ohms

You can turn the speaker emulator off, but it actually sounds pretty good.

Jim
Old 31st December 2014
  #4
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If that actually works without something breaking, it sounds like instant hearing loss to me.
Old 31st December 2014
  #5
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couch11's Avatar
 

Quote:
Originally Posted by PGrant View Post
If that actually works without something breaking, it sounds like instant hearing loss to me.
Reread the OP's post. He isn't using the earpiece to hear the guitar, he is using it as a load.
Old 1st January 2015
  #6
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travisbrown's Avatar
Just go get a load resistor from RadioShack for $3.

Or for fun, use an incandescent lightbulb for variable resistance.
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