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Post subject: OK, dumb question on combo amps
Posted: Sun May 16, 2010 4:20 pm
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I've got a reissue '65 deluxe reverb. Do I understand correctly that I can take an amp head and pug it into the back of this amp, as long as the speaker ohms are compatible?? Also, what's the rule of thumb for ohms?? This is an 8 ohm system, so to be compatible is it 8 or greater or 8 or less??

Thanks


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Posted: Sun May 16, 2010 4:41 pm
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you can use 8 ohms or greater` but its always best to match the ohms in your case 8.


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Posted: Sun May 16, 2010 4:52 pm
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Not a dumb question. It's always better to ask than assume... :)

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Posted: Sun May 16, 2010 5:09 pm
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If you wire any two amps together via their speaker output jacks you should decide where you'd like the urn sent because you are likely to immolate both of them. They'll probably be able to smell the smoke all the way up IN HEAVEN......!

"Rotsa Ruck"

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Posted: Sun May 16, 2010 5:39 pm
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Retroverbial wrote:
If you wire any two amps together via their speaker output jacks you should decide where you'd like the urn sent because you are likely to immolate both of them. They'll probably be able to smell the smoke all the way up IN HEAVEN......!

"Rotsa Ruck"

Arjay


OK, how about through the speaker input jack??


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Posted: Sun May 16, 2010 6:10 pm
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No no no no no, not at all, not ever.

Dont connect amps together. Dont put the speaker out of one amp to the input of another ever. Or any other kind of speaker out to anything on another amp. You'll wreck em, likely beyond worthwhile repair.

You can take the leads of a speaker in a combo and put that into the speaker out of a head. Dont turn the amplifier section of the combo on though, they need speaker resistance to run without damaging and wont affect the sound anyway.
Also as previously stated match the ohm's of the speaker cab to the head unit.

Finaly dont try and get two amps to share one speaker either.

For instance in this old rig of mine.

Image

The head is using the speakers of the combo, the combo is using the speakers of the 4x12. That kind of switching round is ok as long as you get the speaker ohm's to balance to the output ohms setting.

Hope that helps a bit

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Posted: Sun May 16, 2010 6:54 pm
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nikininja wrote:
You can take the leads of a speaker in a combo and put that into the speaker out of a head. Dont turn the amplifier section of the combo on though, they need speaker resistance to run without damaging and wont affect the sound anyway.
Also as previously stated match the ohm's of the speaker cab to the head unit.


Seems like this is what the OP was asking about.

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Posted: Sun May 16, 2010 7:17 pm
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I'm not clear about what your objective is. If you want to play your guitar through two amps at the same time you will need an a-b-y switch box. If you just want to run a second speaker through your DRRI then I would suggest purchasing a 8ohm speaker cabinet. I don't believe you can run another amp through your DRRI to try use it as a second speaker unless czn somehow just use the speaker without turning on the second amp.


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Posted: Mon May 17, 2010 3:58 am
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Kenny V wrote:
I'm not clear about what your objective is. If you want to play your guitar through two amps at the same time you will need an a-b-y switch box. If you just want to run a second speaker through your DRRI then I would suggest purchasing a 8ohm speaker cabinet. I don't believe you can run another amp through your DRRI to try use it as a second speaker unless czn somehow just use the speaker without turning on the second amp.


Thanks guys, I think that Nikininja answered it. But just to be perfectly clear (I hope), I was thinking of buying a low-watt head with some gain to play around with, and considered just getting an amp head instead of another combo. I wanted to know if I could play the head through the speaker of my combo amp, basically using it as an extension cabinet.

I am a bit unclear on one part of the answer though. What exactly are the leads, and how do I hook it up?? That is, my amp in the back has a "speaker out", a "speaker in", which I believe has the internal speaker plugged into it, and then the jack for the internal speaker which is plugged into the speaker in or out jack (i'm not next to it right now). So how does this go to the head?? Run a cable from the out on the head to the speaker in, or plug the 1/4 line from the combo into the head??

Or perhaps this is a sign that I should just leave it alone??


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Posted: Mon May 17, 2010 7:51 am
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biglionfan111 wrote:
Thanks guys, I think that Nikininja answered it. But just to be perfectly clear (I hope), I was thinking of buying a low-watt head with some gain to play around with, and considered just getting an amp head instead of another combo. I wanted to know if I could play the head through the speaker of my combo amp, basically using it as an extension cabinet.

I am a bit unclear on one part of the answer though. What exactly are the leads, and how do I hook it up?? That is, my amp in the back has a "speaker out", a "speaker in", which I believe has the internal speaker plugged into it, and then the jack for the internal speaker which is plugged into the speaker in or out jack (i'm not next to it right now). So how does this go to the head?? Run a cable from the out on the head to the speaker in, or plug the 1/4 line from the combo into the head??

Or perhaps this is a sign that I should just leave it alone??


Ok BigLionFan

Your gonna be good to go. Your ok to do as you wish. Use your combo's speaker as a extension cabinet. I do it all the time and even plug a 4x12 cab into my Vibrochamp XD sometimes when no ones around. Basicaly what you do is work out the ohms of the speaker(s) your using. Take the lead from the speakers, unplug it from the combo's amp chassis, plug it into the relevant speaker out on the head unit your going to get. The speaker out on your amp is likely to plug in a extension cab. You can use that speaker out to go to the combo's speaker. It usually doesnt much matter as long as there is a speaker load connected to it when you switch that amp on. It wont affect switching a external head unit on. Just for emphasis dont switch the combo on whilst it's speaker is connected to a external unit, and dont try sharing speakers.

Aside from that all you have to do is watch speaker impedance mismatches. Your ok if your speaker is rated above your amp. A 4ohm ready amp can handle a 8 ohm speaker. A 8ohm amp can handle a 16 ohm speaker. You will get into trouble the other way round though. Dont plug a 4 ohm speaker into a 8ohm ready amp etc. Dont plug a 16ohm speaker into a 4ohm ready amp. It will run fine for a while but you'll likely fry the amp with prolonged use.

Now finaly your not going to get far by plugging a 30 watt speaker into a 100watt marshall head. The speaker will deliver a maximum of 30watts, you cant push it past that. You'll end up wrecking the speaker.

Hope that helps.
Once more dont switch the amp on without a speaker connected. :wink:

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Post subject: Thanks!!
Posted: Mon May 17, 2010 3:57 pm
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Perfectly clear. Many thanks!


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Posted: Tue May 18, 2010 7:43 pm
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Aside from that all you have to do is watch speaker impedance mismatches. Your ok if your speaker is rated above your amp. A 4ohm ready amp can handle a 8 ohm speaker. A 8ohm amp can handle a 16 ohm speaker. You will get into trouble the other way round though. Dont plug a 4 ohm speaker into a 8ohm ready amp etc. Dont plug a 16ohm speaker into a 4ohm ready amp. It will run fine for a while but you'll likely fry the amp with prolonged use.


There are alot of tube amp guys that will disagree with this statement.
Here's one.
http://www.rickonslow.com/index.php?mod ... ceMatching


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