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Crispy ( 44)
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Joined: 07 Jun 2004
Posts: 1345
United Kingdom
Yorkshire leeds best place in the world
| | Posted: Wed 25 Jun 2008 0:04 | |
I've always been a combo player so you'll have to excuse my ignorance on this.
I'm looking to get an extension cabb to go with my 2x12 combo and am not sure about the whole question of ohms! 
The external speaker outs on the back of my amp are both 4 ohms.
If I get a cab that's 16 ohms is it safe to plug into one of the 4 ohm outputs?
Anyone know about this stuff? 
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Why don't you just make 10 one louder?
The Lost Souls
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jonmy7 ( 96)
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Joined: 07 Feb 2005
Posts: 1977
United Kingdom
Bedfordshire
| | Posted: Wed 25 Jun 2008 9:38 | |
No! that sounds wrong to me.
You'll have to have two 16ohm cabs, one into each of the 4ohm output. This is the correct match.
OR, you can have one 8ohm in one 4ohm output. This is a safe mis-match.
Safe mis-match means it works without damage to amp or cab, but the tone may sound a little different to a correct match (maybe better, maybe worse - or just.. different).
Do not use an unsafe match because at best you'll damage the speakers, or, more likely, damage the amp. This is more true with a tube amp.
For further info, check out this manual: http://www.mesaboogie.com/manuals/Nomad%20Manual.pdf page 36 and on. Lovely simple diagrams of what you can and can not connect. The rules are the same regardless the amp brand.
Hope this helps... all info provide in good spirt but I'm not expert!
Jon
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Crispy (44)
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Joined: 07 Jun 2004
Posts: 1345
United Kingdom
Yorkshire leeds best place in the world
| | Posted: Wed 25 Jun 2008 22:00 | |
Yep my Boogie manual had the same pics in Jon but didn't know if i could just run 1 cab.
So in effect I need an 8 or 4 Ohm cab to run out of the 4 Ohm output.
This is in addition to the combo speakers aswell I assume?
*************************************************
Why don't you just make 10 one louder?
The Lost Souls
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jonmy7 (96)
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Joined: 07 Feb 2005
Posts: 1977
United Kingdom
Bedfordshire
| | Posted: Thu 26 Jun 2008 19:18 | |
On the Nomads, you don't need a 4ohm cab at all as you can't use the 4ohm cab in the 4 ohm output as far as I can tell
The internal speaker is an 8ohm cab, so if you want to use that too you'd either
A) put the 8ohm internal speaker in the 4 ohm output and a 16 ohm cab in the 8 ohm output.
or
B) put the 8ohm internal speaker in the 4 ohm output and a 8 ohm can in the other 4 ohm output
Cheers
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groovetube ( 2)
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Joined: 08 Nov 2005
Posts: 123
United Kingdom
West midlands
| | Posted: Fri 27 Jun 2008 15:40 | |
It is safe to use a speaker with a greater impedance than recommended but not less. The performance will not be as good as one of the correct impedance but you won't damage your output transformer. |
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Crispy (44)
Forum legend
Joined: 07 Jun 2004
Posts: 1345
United Kingdom
Yorkshire leeds best place in the world
| | Posted: Mon 30 Jun 2008 22:35 | |
Jon is right with point A.
This is the response I got (eventually) from Mesa.
You can run a 16ohm cab with the
F100 combo. You will want to run from the 8ohm of the F100 into the
16ohm cab and from the 4ohm of the F100 into the 8ohm internal speaker. |
*************************************************
Why don't you just make 10 one louder?
The Lost Souls
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Edited: Mon 30 Jun 2008 23:36 |
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jonmy7 (96)
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Gold Member
Joined: 07 Feb 2005
Posts: 1977
United Kingdom
Bedfordshire
| | Posted: Tue 01 Jul 2008 8:23 | |
That is going to be one loud setup!
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Crispy (44)
Forum legend
Joined: 07 Jun 2004
Posts: 1345
United Kingdom
Yorkshire leeds best place in the world
| | Posted: Tue 01 Jul 2008 8:45 | |
Well I thought so Jon but a guy on The Boogie Board says it's a bit lacklustre and it's better to just run the on board speakers.
Although he has a different amp to me. I run a 100 watt amp at 60 watts under a limiter switch to drive the tubes harder.
Maybe if I unleash the beast it'll be the biz?
*************************************************
Why don't you just make 10 one louder?
The Lost Souls
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Edited: Tue 01 Jul 2008 9:47 |
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jonmy7 (96)
Moderator
Gold Member
Joined: 07 Feb 2005
Posts: 1977
United Kingdom
Bedfordshire
| | Posted: Tue 01 Jul 2008 11:29 | |
Do the full 100w with extension cab and.... stand well back
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