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Post subject: Hot Rod Deluxe with 2 x 10' speakers
Posted: Thu Nov 05, 2009 8:22 am
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I would like to test the HRD with two 10' speakers, but...

Can I put two 10' 8 ohms (Jensen or Vox) speakers instead of one 12' 8 ohms in a HRD? If so, how should I wire them? One speaker to the main speaker output (8ohms) and the other one to the second speaker output (8 ohms)?

Anyone has done it?

Thanks in advance.


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Posted: Thu Nov 05, 2009 1:34 pm
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How would you physically put 2x 10 inch speakers in a cabinet designed to accommodate one single 12 inch in the first place?


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Posted: Thu Nov 05, 2009 1:42 pm
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atolleter wrote:
How would you physically put 2x 10 inch speakers in a cabinet designed to accommodate one single 12 inch in the first place?

I mean... making a new front for the cabinet to screw the speakers...


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Posted: Thu Nov 05, 2009 1:48 pm
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Why not just get a 2x10 extension cab rated for 8 ohms? It'll probably sound better anyway. 2 10's might be a tight fit and might not leave you enough room for your tubes. Plus it will probably be a tube rattle nightmare.


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Posted: Thu Nov 05, 2009 1:53 pm
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If both speakers are 8ohms and the amp is 8ohms you would have to wire them in series-parallel. Note that in this case the wattage will be 4 times the individual speaker wattage.


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Posted: Thu Nov 05, 2009 3:07 pm
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atolleter wrote:
If both speakers are 8ohms and the amp is 8ohms you would have to wire them in series-parallel. Note that in this case the wattage will be 4 times the individual speaker wattage.


Wouldn't be either series OR parallel depending on the Speaker rating?

http://professional.celestion.com/guita ... index.asp#

http://professional.celestion.com/guita ... /index.asp


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Posted: Thu Nov 05, 2009 3:17 pm
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He specified he wanted to put 2x speakers of each 8ohms onto a 8ohms amp. The load in the end must remain 8ohms.

In series you would multiply the load by the number of speakers while in parallel you would divide the load by the number of speakers.

In series-parallel the load remains the same as the speakers impedance.

In his case 2 x 8 ohms speaker = 8 ohms load.

The series-parallel diagram showed in the link you sent is good for his case.

Now if he decides on different speakers then you may be right, another design may apply.


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Posted: Thu Nov 05, 2009 4:02 pm
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Shoving 2 10's in a HRDlx doesn't strike me as a great idea. If it was, I would imagine Fender would offer it. I'm thinking the bottom end might be tighter, but it might sound a bit boxy just because the cabinets a little small and shallow.


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Posted: Thu Nov 05, 2009 4:24 pm
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Getting a cab as you suggested earlier would also be my choice. Keep the amp original, bypass the stock speaker, plug into a cab, use it as a head and shake the walls...


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Posted: Thu Nov 05, 2009 6:57 pm
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Atolleter:
"If both speakers are 8ohms and the amp is 8ohms you would have to wire them in series-parallel. Note that in this case the wattage will be 4 times the individual speaker wattage."

You have 2 choices when wiring 2 speakers together. Series or parallel. Two 8 ohm speakers will give you a 4 or 16 ohm load.

The series-parallel you are talking about can be done with 4 speakers. The load will be equal to 1 speaker with power handling times 4.


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Posted: Thu Nov 05, 2009 7:13 pm
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Well, as far as I know, any number of speakers can be linked using series-parallel wiring, just as long as the total equivalent load impedance is kept between 2 and 16 ohms.

It's only a combination of the series and parallel in order to keep a load compatible with his amp. I wont go as far as writing the equations :)


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Posted: Thu Nov 05, 2009 7:50 pm
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rjake wrote:
Atolleter:
"If both speakers are 8ohms and the amp is 8ohms you would have to wire them in series-parallel. Note that in this case the wattage will be 4 times the individual speaker wattage."

You have 2 choices when wiring 2 speakers together. Series or parallel. Two 8 ohm speakers will give you a 4 or 16 ohm load.

The series-parallel you are talking about can be done with 4 speakers. The load will be equal to 1 speaker with power handling times 4.


That's what I was thinking too.


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Posted: Thu Nov 05, 2009 11:26 pm
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I don't know why you can't run two 10" 8ohm speakers wired in parallel for a 4ohm load with this amp. The manual gives the various hook-up scenarios, so you don't void your warranty. But given the overheating concerns and diminished tube life, do you really want to? A seperate cab as a test or for periodic use-Yeah, but as a steady diet-No. IMHO Not with this model, from what I hear. Seems like this amp has enough on it's plate to just keep working everyday, without asking it to work harder. As far as the stock cab-chassis dimensions and oriention, don't know if it would fit. I had a custom built 2X10 combo cab made for my '68 Bassman head(diagonal speakers) 22"Wx20"Hx10"D. The Hot Rod Deluxe cab is 18.75"Wx23.5"Hx10.5"D. You know, if that amp was a little more robust, I'd say"Go for it." It's a neat idea! ART

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Posted: Fri Nov 06, 2009 1:33 am
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Thank you very very much, guys!
I am afraid I will give up the idea to put 2x10 inside the HRD.

My band mate is going to give me a 12' Clestion Greenback, just to test with the HRD. I know it is only 25w... but I will use the 2nd input, which lows de output 3db, which I think it reduces the amp half the wattage (20w.). Right?

thanks.


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Posted: Fri Nov 06, 2009 2:24 am
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Eladin the 2nd input only lowers the signal that the pre amp gets. The power amp section can still operate at it's rated output(40watts). That being said, the amp will only make that much wattage if it's near wide open and the power tubes are strong and biased hot enough to produce that much wattage. So a test at reasonable volume levels is safe. A Vintage 30 would be a fun test. ART

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