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Author Topic:  Nashville as Speaker Cabinet?
Garth Highsmith

 

Post  Posted 11 Oct 2004 10:52 am    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jim Dempsey

 

From:
Belmar, New Jersey, USA
Post  Posted 11 Oct 2004 11:14 am    
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I too want to run a Musicman head through a Nash cab.I'm not sure how the BW is going to sound through a tube head.I am also looking for a JBL K 140 ,just in case it doesn't work.-Jim
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Brad Sarno


From:
St. Louis, MO USA
Post  Posted 11 Oct 2004 12:37 pm    
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The Black Widows sound great driven by Fender tube amps. I prefer the older ones, but they all do well.

Brad Sarno

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Jerry Overstreet


From:
Louisville Ky
Post  Posted 11 Oct 2004 12:41 pm    
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Installing and wiring a jack is no big dea. I have done it several times, BUT the Bassman needs at least an 8 ohm load as far as I know or it won't live very long.
You're best bet would be to install an 8 ohm speaker in your NV. This would diminish slightly the power of your 400 amp, but won't destroy it as in the other scenario.
Alternately, I have a NV 400 head cabinet kit for your PV if you can use another 8 ohm cabinet.
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Garth Highsmith

 

Post  Posted 11 Oct 2004 12:41 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Garth Highsmith

 

Post  Posted 11 Oct 2004 12:50 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jon Light


From:
Saugerties, NY
Post  Posted 11 Oct 2004 12:55 pm    
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Yes, Garth--

https://weberspeakerscom.secure.powweb.com/store/zmatch.htm

this is that.....

Weber is continually coming up with practical stuff for non-stock options. I haven't gotten one of these yet but I just read a review that said that A) it works and B) it doesn't alter tone.
They also make a one speaker cab/multi amp head switching box that keeps proper load on the not-in-use amp but it is configured as a 4x1 unit and costs over $200.

[This message was edited by Jon Light on 11 October 2004 at 01:57 PM.]

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Jerry Overstreet


From:
Louisville Ky
Post  Posted 11 Oct 2004 12:59 pm    
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I repectfully defer to Mike Brown, Ken Fox, Brad and the other electronics experts here. I could even be wrong about the Bassman's requirements, but I don't recall any that can use a 4 ohm load. If it has a switch that has a 4 ohm position on it, no problem. There is probably a way to add a dummy load, but I don't know how practical it would be or what is involved. Good Luck JO.
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Garth Highsmith

 

Post  Posted 11 Oct 2004 1:31 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jon Light


From:
Saugerties, NY
Post  Posted 11 Oct 2004 1:40 pm    
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Some additional thoughts....

conventional wisdom is that a Fender transformer can tolerate the 100% mismatch you are talking about with no problem. What I don't know about is what happens if you hook up two amps to one speaker cab simultaneously and if there will be any interactivity in the impedance loads. I think you allude to the same uncertainty in your previous post. What you CANNOT do under any circumstances is have an A/B switcher that would leave the Fender with no load. The Fender must see that speaker load at all times. Or a dummy load that the Weber 4x1 switcher provides.
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Garth Highsmith

 

Post  Posted 11 Oct 2004 1:56 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Garth Highsmith

 

Post  Posted 11 Oct 2004 2:06 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jon Light


From:
Saugerties, NY
Post  Posted 11 Oct 2004 2:11 pm    
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Now things are getting confusing.

Consider:

An A/B switch to choose between two amps and one speaker would be exactly the same as unplugging one head and plugging in the other. This is an absolute no no with a tube amp.

The Z-selector will cover your impedance mismatch (8 ohms to 4 ohms) but it will not take care of your switching issue between the two heads.

The 4-way switcher WILL take care of the issue of running the Fender without the speaker load but I'm not certain if it will deal with the impedance mismatch (which, as I said, is not really a major issue--Fenders can take it).

And the #1 question that I'd love an answer to myself-----what happens if you just connect two amps to one speaker without switching between them---just leaving them both on and live? I have a feeling it's not cool but I really don't know.

----
----

no---that mixer is for guitars, mics, line level inputs. We are talking about big loads. Resistors the size of fingers rated for 50 watts rather than rated for 1/2 watts. You could try it though if like the smell of things burning .

[This message was edited by Jon Light on 11 October 2004 at 03:16 PM.]

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Garth Highsmith

 

Post  Posted 11 Oct 2004 2:18 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jerry Overstreet


From:
Louisville Ky
Post  Posted 11 Oct 2004 2:28 pm    
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Per my disclaimer in a previous post, I defer to Jon on the impedance tolerance of the Fender. I have no practical experience in the area, just going by what I have read and heard. As far as using the same speaker for 2 amps, I was just assuming that the amp not in use would be shut down which is what I do. I apologize for any mis-information and/or confusion my comments may have caused.
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Tom Gorr

 

From:
Three Hills, Alberta
Post  Posted 11 Oct 2004 2:36 pm    
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! DANGER !

I was about to do the same thing with my Vegas 400, and drive the BW using a PV Classic 50/50 tube power amp either out of one channel, or alternatively, using a bridged 100W mono channel.

I 'almost' started soldering in a 1/4" switching jack (eg. the two power amps would share a common ground) before my sensibilities kicked in, and I called Mike Brown (who patched in a technician to our call) to see if I was putting me or my amp in danger. Turns out, I was.....Phone Peavey!

Generally, the 400 has the (-) terminal of the speaker pegged to ground. The tube power amp (in bridged/mono mode)has a "floating" negative terminal, which would create problems, not the least of which is some potential for getting zapped. Also, current flow into the solid state power amp from the tube amp may create damage.

We decided that a heavy duty toggle switch ( Double pull-double throw ?? ) that completely isolates both the hot and negative/ground of each power amp circuits is, at minimum, a "must have" for safety and equipment longevity reasons.

Of course the 50/50 power amp has an impedance toggle on the back that allows me to match things up. So that helped on that issue.

Don't proceed without getting some qualified help. BTW - I'm not qualified, and I posted this just to let you know my experience.

[This message was edited by Tom Gorr on 11 October 2004 at 03:39 PM.]

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Garth Highsmith

 

Post  Posted 11 Oct 2004 2:53 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jon Light


From:
Saugerties, NY
Post  Posted 11 Oct 2004 4:00 pm    
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Thanks very much, Tom.

Jerry---I can't keep count of the number of times I've been corrected. I have tremendous faith in the knowledge base of this forum and as strange as it may sound, I'm glad to have a lot of back and forth chatter, even if wrong info gets passed. The bottom line is that the correct info will emerge and a bunch of learning will get done. Suits me better than the people that know being quiet and the people who don't (usually me) staying uneducated.
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Steve Hinson

 

From:
Hendersonville Tn USA
Post  Posted 11 Oct 2004 5:21 pm    
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...Bassman heads are designed to handle 4 ohm loads...the cabinets contained 2 8 ohm speakers...I own 4 Bassman heads and have used all of them with a Marrs cab containing a 4 ohm BW with no problem...hope this helps...Steve
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Garth Highsmith

 

Post  Posted 12 Oct 2004 4:30 pm    
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[This message was edited by Garth Highsmith on 09 January 2006 at 08:56 PM.]

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Jennings Ward

 

From:
Edgewater, Florida, R.I.P.
Post  Posted 13 Oct 2004 8:42 am    
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Remember those fameous 3 little words..DON'T DO IT!!!!! or you will be sorry, $$$$$$$$$$$ is the least of you problems////kapish?

Jennings

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EMMONS D10 10-10 profex 2 deltafex ne1000 pv1000, pv 31 bd eq, +
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