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Re: OT Marshall amp + external spk

it is passive and it wants to see a 4 ohm load, a 16 ohm load will more 
than likely make it run less efficiently, and could eventually harm the 
amp you are using the other thing to consider is the age and efficiency of 
that 10 inch speaker in the vibraton which is getting old at this point, 
the paper is very dry and I doubt the speaker was very  efficient to begin 
with. I tried one out a few months back that had come in to our store used 
and though it worked with a 8 ohm deluxe reverb, it really shined with the 
more powerful fender twin and its 4 ohm load
On Aug 18, 2014, at 2:14 AM, andy butler <akbutler@tiscali.co.uk> wrote:

> On 18/08/2014 08:30, Michael Peters wrote:
>> here's a technical question that is not about looping:
>> I tried plugging it into the Marshall once - not only was the resulting
>> The leslie (according to the vibratone page) has a 4 ohm speaker.
>> The combo amp has two outputs one of which is plugged into its 16 ohm 
>> combo
>> internal speaker. The other output is unused. The outputs are labelled 
>> with
>> "40 W RMS into 8/16 ohm".  There is a switch that says "8 / 16 ohm" and 
>> it
>> is set to 16 ohm.
> ...and the amp survived! lucky man.
> As Per says, we don't know if there's an amp in the leslie.
> Assuming it's passive the relevant rule is:-
> "Never connect an amplifier to a speaker of lower rated impedance."
> Match the impedance if possible, and if the speaker is higher impedance
> than the amp you're safe, but it won't be as loud.
> If it's active then ...what Per says.
> andy