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Vetta Ii Combo - Connecting Two Cabinets (1x12 Speaker Each)


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#1 federicomelis

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Posted 28 March 2014 - 05:30 AM

Good afternoon.

I would like to connect my two Hayden cabinets (1x12 speaker each - 16Ohm) to my Vetta II combo.

From the manual I understood that I can use both of the configurations (Normal or Split Stereo mode) but which one assures me more balancing between the two channels in case I want all 4 speakers (2 of the combo plus the additional 2 Hayden) working? 

I guess the Normal mode...
 
 
Another solution would be to daisy chain the 2 Hayden cabs obtaining 8 Ohm and connecting to the Left (External cab) output but I would run into the same uneven loading problem?
 
Can you please advice?
 
Thanks

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#2 DickFoster

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Posted 28 March 2014 - 09:29 AM

 

Good afternoon.

I would like to connect my two Hayden cabinets (1x12 speaker each - 16Ohm) to my Vetta II combo.

From the manual I understood that I can use both of the configurations (Normal or Split Stereo mode) but which one assures me more balancing between the two channels in case I want all 4 speakers (2 of the combo plus the additional 2 Hayden) working? 

I guess the Normal mode...
 
 
Another solution would be to daisy chain the 2 Hayden cabs obtaining 8 Ohm and connecting to the Left (External cab) output but I would run into the same uneven loading problem?
 
Can you please advice?
 
Thanks

 

As your external speakers are 16 ohm and the internals are 8, your internal speakers would be louder than your externals but I suppose it depends on what you're trying to do. If you ran it in split stereo one channel, the internal speakers, would be much louder than the external speakers. I suggest normal to keep things more in balance.  

 

If you just want to spread it out a bit sonically speaking it would probably work out OK in normal stereo but the externals won't be as loud as the internals. The parallel combination of internal and external would be 5.33333 ohms for each channel in normal mode but in split stereo you'd have 4ohm load on one channel and 8ohms on the other, a large imbalance.

 

You could also disconnect the internal speakers and run the externals alone if you want it to sound more spaced out with the two channels more spatially isolated. More impedance is not going to hurt anything, it just won't deliver as much power but you probably don't need it anyway.

 

Just don't run any combination that falls below 4 ohms total impedance for either channel or you could toast your power amps.   

 

 

BTW if you daisy chain or run them in series you'll end up with 32 ohms not 8. To get 8ohms you need to wire the two 16s in parallel.


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#3 federicomelis

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Posted 28 March 2014 - 11:06 AM

Thanks for your reply..

anyway, the parallel combination of internal and external would be 16 // 8 = 12 ohms and not 5.33 ohms for each channel in normal mode....  I think this is the best configuration if I want to use all 4 speakers


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#4 federicomelis

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Posted 28 March 2014 - 11:08 AM

maybe a solution would be to disconnect ONE internal speaker and run it in split mode with the other 2 in parallel.... like this I can achieve a balance (8 ohms per channel)...

One channel is going to go through one speaker only by the way....


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#5 DickFoster

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Posted 28 March 2014 - 01:56 PM

Sorry but you are most definatley Wrong.
For two resistances in parallel the total can never be greater than the lowest resistance in the pair.

The formula for two resistances in parallel is

R1 X R2
--------
R1 + R2

It's not 12ohms and can't possibly be more than 8 ohms. It's 5.333 ohms for each channel with the two speakers in parallel an 8 and a 16.

Do it yourself.

http://www.sengpiela...paralresist.htm

Just plug 8 into one slot and 16 in the other and hit calculate.

You can also do it with this formula
1/RT = 1/R1 + 1/R2 + 1/R3 = 1/R4 and so on depending on how many resistors you have in parallel
but the answer will be the same.

I wasn't an EE for over 40 years for nutin. This is really simple, I used have to do this sort of thing and much more with sliderules. You have it easy these days. LOL

Thanks for your reply..
anyway, the parallel combination of internal and external would be 16 // 8 = 12 ohms and not 5.33 ohms for each channel in normal mode....  I think this is the best configuration if I want to use all 4 speakers

 
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#6 DickFoster

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Posted 28 March 2014 - 02:01 PM

 
I don't think so as you'd have a large difference in speaker cone area which is still going to give you a large sonic imbalance even if the speaker impedance is equal on both channels.

I think your best best is to run it in normal mode or to disconnect both internal speakers and run only the externals if you want more Left and Right seperation.

You asked.

maybe a solution would be to disconnect ONE internal speaker and run it in split mode with the other 2 in parallel.... like this I can achieve a balance (8 ohms per channel)...
One channel is going to go through one speaker only by the way....

 
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