speaker ohms to low

my89_928gt · 18th March 2006, 08:15 AM

I have some surond speakers that I was going to run a second set of surounds(not 7.1 though doing that also).
But, to run the suround A and suround B the speaker loads have to be a min of 12 ohms each. They are 8 ohms

Is it possable to raise the ohm value of the speakers(say by adding a 4 ohm metal film resistor in series with the speaker wire)

All my speakers are MB Quarts except the sub.

Thanks for any thoughts,

Richard

AndrewT · 18th March 2006, 08:41 AM

Hi,
you could try adding a 3r9 resistor to each speaker and listen to the effect.

That series resistor will affect the damping (Q) of the speaker with the result that the bass will sound completely different.

You will need a power resistor to be able to dissipate the heat during loud music sessions. Try ten parallel 39r 600mW giving 6W capacity.

Bazukaz · 18th March 2006, 10:37 AM

I see no reason why a wirewound cannot be used here.Its inductance will be very small , compared to speaker's. These are often used in passive crossovers.

Regards,
Lukas.

myhrrhleine · 18th March 2006, 06:25 PM

Personally, I wouldn't worry about the impedence and simply play them at slightly less than maximum volume level.

rabbitz · 19th March 2006, 01:21 AM

I agree with myhrrhleine and use them as is.

I had a set of rears that went down to 3R8 on a HT receiver that recommended 6R minimum. No problems and as long as you aren't driving to crazy levels it should be cool.

my89_928gt · 20th March 2006, 01:36 PM

I think I will see how much warmer it runs. If it dose not seem to get much warmer then I will not worry about it. Other than maybe putting a small fan on it to make sure it stays cool.

Thanks guys,

Richard

sreten · 20th March 2006, 01:42 PM

Hi,

the loading seems to stem from 6ohm minimum and two sets in parallel.

So ignore the surround B connections and wire the two L and
two R speakers in series if you are concerned about loading.

The series resistor idea will tonally unbalance the speakers.

/sreten.

18th March 2006, 08:15 AM	#1
my89_928gt diyAudio Member Join Date: Mar 2006 Location: Fort worth, Tx	speaker ohms to low I have some surond speakers that I was going to run a second set of surounds(not 7.1 though doing that also). But, to run the suround A and suround B the speaker loads have to be a min of 12 ohms each. They are 8 ohms Is it possable to raise the ohm value of the speakers(say by adding a 4 ohm metal film resistor in series with the speaker wire) All my speakers are MB Quarts except the sub. Thanks for any thoughts, Richard

18th March 2006, 08:41 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, you could try adding a 3r9 resistor to each speaker and listen to the effect. That series resistor will affect the damping (Q) of the speaker with the result that the bass will sound completely different. You will need a power resistor to be able to dissipate the heat during loud music sessions. Try ten parallel 39r 600mW giving 6W capacity. __________________ regards Andrew T.

19th March 2006, 01:21 AM	#5
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	I agree with myhrrhleine and use them as is. I had a set of rears that went down to 3R8 on a HT receiver that recommended 6R minimum. No problems and as long as you aren't driving to crazy levels it should be cool. __________________ No longer DIY active

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18th March 2006, 10:37 AM	#3
Bazukaz diyAudio Member Join Date: Nov 2005 Location: Vilnius	I see no reason why a wirewound cannot be used here.Its inductance will be very small , compared to speaker's. These are often used in passive crossovers. Regards, Lukas.

18th March 2006, 06:25 PM	#4
myhrrhleine diyAudio Member Join Date: Jan 2006 Location: Avalon Island	Personally, I wouldn't worry about the impedence and simply play them at slightly less than maximum volume level.

20th March 2006, 01:36 PM	#6
my89_928gt diyAudio Member Join Date: Mar 2006 Location: Fort worth, Tx	I think I will see how much warmer it runs. If it dose not seem to get much warmer then I will not worry about it. Other than maybe putting a small fan on it to make sure it stays cool. Thanks guys, Richard

20th March 2006, 01:42 PM	#7
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, the loading seems to stem from 6ohm minimum and two sets in parallel. So ignore the surround B connections and wire the two L and two R speakers in series if you are concerned about loading. The series resistor idea will tonally unbalance the speakers. /sreten.

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