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Re: OT Marshall amp + external spk

PS conventional wisdom these days with vintage amps, is to remove the 
original speaker and replace it. Old amps will last forever if properly 
maintained, but old speakers don't, Sure you could use it till it blows 
and have it re-coned, but replacing a speaker will allow you to preserve 
the old one, and in some cases also allow you to put something modern and 
more efficient in it. My Princeton has a much more robust speaker in it 
than the original with better db rating and the amp is louder as a result
On Aug 18, 2014, at 8:39 AM, bill walker <wildbillwalker@icloud.com> wrote:

> 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
> Bill
> 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