problem with speaker

plig88 · 2013-02-19 2:02 pm

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

Dumbledog · 2013-02-19 2:35 pm

Could be the speaker, could be the amp. It's hard to say exactly. It's possible you would have overdriven the oval speaker, especially if the guitar amp was turned up with a lot of overdrive. Was the guitar amp working before you tried it with the oval speaker? Or was this the first time you have tried the amp?

plig88 · 2013-02-19 2:38 pm

it's a first time...but when i play in clean channel, eveything is o.k...when i put in overdrive have a problem....so the speaker have problem. right?

Dumbledog · 2013-02-19 3:04 pm

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 · 2013-02-19 3:08 pm

or change the speaker

thank you

JMFahey · 2013-02-19 4:02 pm

The Marshall 18W amplifier has no overdrive channel .

plig88 · 2013-02-19 8:13 pm

yes i know ..but when you put the cable in hi input jack and the volume in maximun. the sound is overdrive......that i say...

JMFahey · 2013-02-19 8:23 pm

OK, now we're talking.
Where is that car speaker mounted?
In a suitable enclosure or just "on the table"?
If in an enclosure, is it open or closed?

plig88 · 2013-02-19 8:54 pm

i put off from car and i make cabine for the speaker before used....

plig88 · 2013-02-20 7:33 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 · 2013-02-20 8:17 am

I don't believe that marshall's output transformer has a 4 ohm tap.... probably just 8 or 16 some after markets have 4 ohm tap but still you need check that out....if it was set on 16 ohm tap and going into a 4 ohm load....

plig88 · 2013-02-20 8:20 am

it's clone of marshall. i make it....

JRGuitarGuy · 2013-02-20 8:20 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?

plig88 · 2013-02-20 8:22 am

classic tone magnetics

JRGuitarGuy · 2013-02-20 8:30 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 · 2013-02-20 8:38 am

yes......so can you help me in something else???...visit here in another post.... http://www.diyaudio.com/forums/tube...r-used-2x-18watt-2x-10-watt-18-watts-amp.html

JRGuitarGuy · 2013-02-20 8:41 am

No offense man but I couldn't understand what you are trying to do lol

JRGuitarGuy · 2013-02-20 8:44 am

good thing though you said you DO HAVE a 4ohm tap, hope its set on the 4 ohm tap lol
man you need a nice 4x12 for that amp man just my opinion nothing quite like a 4x12 or 2 getting cranked up and Roaring lol

plig88 · 2013-02-20 9:09 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;;;;;;;;;;;

tikiroo · 2013-02-20 8:25 pm

From your first post, sound disappearing for a second then coming back sounds like blocking distortion:

Blocking Distortion

problem with speaker

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