• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

problem with speaker

plig88

Member
2013-01-04 11:40 am
hello everyone...i have a valve guitar amp( clone of marshall 1974x) and i don't have amp speaker..today i used the speaker from my car and is 160watt 4 ohm ( oval speaker ). i connect with my amp, and i playing ..after 2-3 minutes the sound in speaker it's like the wire have problem, ie pause the audio and restarts after a second...my amp is 18 watt......i don't know.....the speaker for hi-fi are diferents from guitar speakers? or my el84 power tubes have problem???? please help me
 
If it is only a problem when on overdrive I would think it's the amp then. When using the amp on overdrive you could more easily burn out the speaker if its not built to be used in a guitar amp. But because the speaker is working when the amp is set to clean the speaker probably did not get burned out. The issue lies in the overdrive circuit.
 

plig88

Member
2013-01-04 11:40 am
logic would be to blame SPEAKER hi-fi...
I do not think the blame Amplifier.....i want to try to playing with guitar speaker. i have one 100 watt from my marshall but
I do not know whether any harm to the speaker ... the amp is 18 watts and 100 watts speakers are....someone know about those range? is bad to use 100 watts speaker from 18 watts output???
 

JRGuitarGuy

Banned
2012-10-09 11:25 am
wattage from amp can be pretty low and its still perfectly fine driving a 100watt speaker you have, its impedance matching that is really important especially that Marshall you have, you say its a clone so god knows what output tranny is in it lol. mercury magnetic's maybe?
 

JRGuitarGuy

Banned
2012-10-09 11:25 am
its a car sub speaker.... and wrong impedance one poster said you were overdriveing the speaker..... no you were not if it was really 160 watts and that amp was 18watts clean more distorted but not no where near enough to overdrive that speaker.... bet it sounded horrible being that most car subs have a voice coil larger than 2inches and not really designed for higher frequencies lol. was it sterile as hell sounding? lol
 

plig88

Member
2013-01-04 11:40 am
Another thing I want to say that .... This amp has an output bus to 100 watts. and the cabin has 4 speakers 70 watts each ...... so the watts from the amplifier output divided; The 'should be used or the forced itself says watt amplifier with YOU WANT Number of speakers;;;;;;;;;;;