by Jef » Wed Mar 05, 2008 12:52 pm
The load that they are referring to is the resistance rating of the speaker cabinet that you will be using with that particular guitar amp.
If the impedance of the cabinet is not printed on it, you can use an ohmeter to measure it.
The input jacks on speaker cabinets for guitar amps are usually 1/4" so all you need is a 1/4" (TS) plug with a short length of cable that has the wire ends bare. Just take a reading across the + and - wires.
The cabinet may have more than one speaker in it and in many cases they may be wired in a combination of parallel and series configuration. This is why you need to check the impedance of the cabinet and not the individual speakers.
For instance, if there are 2 speakers in a cabinet and each speaker is rated at 8Ω, if they are wired parallel, your cabinet will have a total impedance of 4Ω. If they are wired in series, it will be 16Ω.
Many guitar amps have a switchable speaker output to match the speaker load.
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